drm/amdkfd: Remove BUG_ONs for NULL pointer arguments

Remove BUG_ONs that check for NULL pointer arguments that are
dereferenced in the same function. Dereferencing the NULL pointer
will generate a BUG anyway, so the explicit check is redundant and
unnecessary overhead.
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>

drivers/gpu/drm/amd/amdkfd/kfd_dbgdev.c

@@ -42,8 +42,6 @@
 
 static void dbgdev_address_watch_disable_nodiq(struct kfd_dev *dev)
 {
-	BUG_ON(!dev || !dev->kfd2kgd);
-
 	dev->kfd2kgd->address_watch_disable(dev->kgd);
 }
 
@@ -62,7 +60,7 @@ static int dbgdev_diq_submit_ib(struct kfd_dbgdev *dbgdev,
 	unsigned int *ib_packet_buff;
 	int status;
 
-	BUG_ON(!dbgdev || !dbgdev->kq || !packet_buff || !size_in_bytes);
+	BUG_ON(!size_in_bytes);
 
 	kq = dbgdev->kq;
 
@@ -168,8 +166,6 @@ static int dbgdev_diq_submit_ib(struct kfd_dbgdev *dbgdev,
 
 static int dbgdev_register_nodiq(struct kfd_dbgdev *dbgdev)
 {
-	BUG_ON(!dbgdev);
-
 	/*
 	 * no action is needed in this case,
 	 * just make sure diq will not be used
@@ -187,8 +183,6 @@ static int dbgdev_register_diq(struct kfd_dbgdev *dbgdev)
 	struct kernel_queue *kq = NULL;
 	int status;
 
-	BUG_ON(!dbgdev || !dbgdev->pqm || !dbgdev->dev);
-
 	status = pqm_create_queue(dbgdev->pqm, dbgdev->dev, NULL,
 				&properties, 0, KFD_QUEUE_TYPE_DIQ,
 				&qid);
@@ -215,8 +209,6 @@ static int dbgdev_register_diq(struct kfd_dbgdev *dbgdev)
 
 static int dbgdev_unregister_nodiq(struct kfd_dbgdev *dbgdev)
 {
-	BUG_ON(!dbgdev || !dbgdev->dev);
-
 	/* disable watch address */
 	dbgdev_address_watch_disable_nodiq(dbgdev->dev);
 	return 0;
@@ -227,8 +219,6 @@ static int dbgdev_unregister_diq(struct kfd_dbgdev *dbgdev)
 	/* todo - disable address watch */
 	int status;
 
-	BUG_ON(!dbgdev || !dbgdev->pqm || !dbgdev->kq);
-
 	status = pqm_destroy_queue(dbgdev->pqm,
 			dbgdev->kq->queue->properties.queue_id);
 	dbgdev->kq = NULL;
@@ -245,8 +235,6 @@ static void dbgdev_address_watch_set_registers(
 {
 	union ULARGE_INTEGER addr;
 
-	BUG_ON(!adw_info || !addrHi || !addrLo || !cntl);
-
 	addr.quad_part = 0;
 	addrHi->u32All = 0;
 	addrLo->u32All = 0;
@@ -287,8 +275,6 @@ static int dbgdev_address_watch_nodiq(struct kfd_dbgdev *dbgdev,
 	struct kfd_process_device *pdd;
 	unsigned int i;
 
-	BUG_ON(!dbgdev || !dbgdev->dev || !adw_info);
-
 	/* taking the vmid for that process on the safe way using pdd */
 	pdd = kfd_get_process_device_data(dbgdev->dev,
 					adw_info->process);
@@ -362,8 +348,6 @@ static int dbgdev_address_watch_diq(struct kfd_dbgdev *dbgdev,
 	/* we do not control the vmid in DIQ mode, just a place holder */
 	unsigned int vmid = 0;
 
-	BUG_ON(!dbgdev || !dbgdev->dev || !adw_info);
-
 	addrHi.u32All = 0;
 	addrLo.u32All = 0;
 	cntl.u32All = 0;
@@ -508,8 +492,6 @@ static int dbgdev_wave_control_set_registers(
 	union GRBM_GFX_INDEX_BITS reg_gfx_index;
 	struct HsaDbgWaveMsgAMDGen2 *pMsg;
 
-	BUG_ON(!wac_info || !in_reg_sq_cmd || !in_reg_gfx_index);
-
 	reg_sq_cmd.u32All = 0;
 	reg_gfx_index.u32All = 0;
 	pMsg = &wac_info->dbgWave_msg.DbgWaveMsg.WaveMsgInfoGen2;
@@ -610,8 +592,6 @@ static int dbgdev_wave_control_diq(struct kfd_dbgdev *dbgdev,
 	struct pm4__set_config_reg *packets_vec;
 	size_t ib_size = sizeof(struct pm4__set_config_reg) * 3;
 
-	BUG_ON(!dbgdev || !wac_info);
-
 	reg_sq_cmd.u32All = 0;
 
 	status = dbgdev_wave_control_set_registers(wac_info, &reg_sq_cmd,
@@ -725,8 +705,6 @@ static int dbgdev_wave_control_nodiq(struct kfd_dbgdev *dbgdev,
 	union GRBM_GFX_INDEX_BITS reg_gfx_index;
 	struct kfd_process_device *pdd;
 
-	BUG_ON(!dbgdev || !dbgdev->dev || !wac_info);
-
 	reg_sq_cmd.u32All = 0;
 
 	/* taking the VMID for that process on the safe way using PDD */
@@ -851,8 +829,6 @@ int dbgdev_wave_reset_wavefronts(struct kfd_dev *dev, struct kfd_process *p)
 void kfd_dbgdev_init(struct kfd_dbgdev *pdbgdev, struct kfd_dev *pdev,
 			enum DBGDEV_TYPE type)
 {
-	BUG_ON(!pdbgdev || !pdev);
-
 	pdbgdev->dev = pdev;
 	pdbgdev->kq = NULL;
 	pdbgdev->type = type;

drivers/gpu/drm/amd/amdkfd/kfd_dbgmgr.c

@@ -44,8 +44,6 @@ struct mutex *kfd_get_dbgmgr_mutex(void)
 
 static void kfd_dbgmgr_uninitialize(struct kfd_dbgmgr *pmgr)
 {
-	BUG_ON(!pmgr);
-
 	kfree(pmgr->dbgdev);
 
 	pmgr->dbgdev = NULL;
@@ -66,7 +64,6 @@ bool kfd_dbgmgr_create(struct kfd_dbgmgr **ppmgr, struct kfd_dev *pdev)
 	enum DBGDEV_TYPE type = DBGDEV_TYPE_DIQ;
 	struct kfd_dbgmgr *new_buff;
 
-	BUG_ON(!pdev);
 	BUG_ON(!pdev->init_complete);
 
 	new_buff = kfd_alloc_struct(new_buff);
@@ -96,8 +93,6 @@ bool kfd_dbgmgr_create(struct kfd_dbgmgr **ppmgr, struct kfd_dev *pdev)
 
 long kfd_dbgmgr_register(struct kfd_dbgmgr *pmgr, struct kfd_process *p)
 {
-	BUG_ON(!p || !pmgr || !pmgr->dbgdev);
-
 	if (pmgr->pasid != 0) {
 		pr_debug("H/W debugger is already active using pasid %d\n",
 				pmgr->pasid);
@@ -118,8 +113,6 @@ long kfd_dbgmgr_register(struct kfd_dbgmgr *pmgr, struct kfd_process *p)
 
 long kfd_dbgmgr_unregister(struct kfd_dbgmgr *pmgr, struct kfd_process *p)
 {
-	BUG_ON(!p || !pmgr || !pmgr->dbgdev);
-
 	/* Is the requests coming from the already registered process? */
 	if (pmgr->pasid != p->pasid) {
 		pr_debug("H/W debugger is not registered by calling pasid %d\n",
@@ -137,8 +130,6 @@ long kfd_dbgmgr_unregister(struct kfd_dbgmgr *pmgr, struct kfd_process *p)
 long kfd_dbgmgr_wave_control(struct kfd_dbgmgr *pmgr,
 				struct dbg_wave_control_info *wac_info)
 {
-	BUG_ON(!pmgr || !pmgr->dbgdev || !wac_info);
-
 	/* Is the requests coming from the already registered process? */
 	if (pmgr->pasid != wac_info->process->pasid) {
 		pr_debug("H/W debugger support was not registered for requester pasid %d\n",
@@ -152,9 +143,6 @@ long kfd_dbgmgr_wave_control(struct kfd_dbgmgr *pmgr,
 long kfd_dbgmgr_address_watch(struct kfd_dbgmgr *pmgr,
 				struct dbg_address_watch_info *adw_info)
 {
-	BUG_ON(!pmgr || !pmgr->dbgdev || !adw_info);
-
-
 	/* Is the requests coming from the already registered process? */
 	if (pmgr->pasid != adw_info->process->pasid) {
 		pr_debug("H/W debugger support was not registered for requester pasid %d\n",

drivers/gpu/drm/amd/amdkfd/kfd_device.c

@@ -341,8 +341,6 @@ void kgd2kfd_device_exit(struct kfd_dev *kfd)
 
 void kgd2kfd_suspend(struct kfd_dev *kfd)
 {
-	BUG_ON(!kfd);
-
 	if (kfd->init_complete) {
 		kfd->dqm->ops.stop(kfd->dqm);
 		amd_iommu_set_invalidate_ctx_cb(kfd->pdev, NULL);
@@ -356,8 +354,6 @@ int kgd2kfd_resume(struct kfd_dev *kfd)
 	unsigned int pasid_limit;
 	int err;
 
-	BUG_ON(kfd == NULL);
-
 	pasid_limit = kfd_get_pasid_limit();
 
 	if (kfd->init_complete) {
@@ -394,8 +390,6 @@ static int kfd_gtt_sa_init(struct kfd_dev *kfd, unsigned int buf_size,
 {
 	unsigned int num_of_bits;
 
-	BUG_ON(!kfd);
-	BUG_ON(!kfd->gtt_mem);
 	BUG_ON(buf_size < chunk_size);
 	BUG_ON(buf_size == 0);
 	BUG_ON(chunk_size == 0);
@@ -445,8 +439,6 @@ int kfd_gtt_sa_allocate(struct kfd_dev *kfd, unsigned int size,
 {
 	unsigned int found, start_search, cur_size;
 
-	BUG_ON(!kfd);
-
 	if (size == 0)
 		return -EINVAL;
 
@@ -551,8 +543,6 @@ int kfd_gtt_sa_free(struct kfd_dev *kfd, struct kfd_mem_obj *mem_obj)
 {
 	unsigned int bit;
 
-	BUG_ON(!kfd);
-
 	/* Act like kfree when trying to free a NULL object */
 	if (!mem_obj)
 		return 0;

drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c

@@ -79,20 +79,17 @@ static bool is_pipe_enabled(struct device_queue_manager *dqm, int mec, int pipe)
 
 unsigned int get_queues_num(struct device_queue_manager *dqm)
 {
-	BUG_ON(!dqm || !dqm->dev);
 	return bitmap_weight(dqm->dev->shared_resources.queue_bitmap,
 				KGD_MAX_QUEUES);
 }
 
 unsigned int get_queues_per_pipe(struct device_queue_manager *dqm)
 {
-	BUG_ON(!dqm || !dqm->dev);
 	return dqm->dev->shared_resources.num_queue_per_pipe;
 }
 
 unsigned int get_pipes_per_mec(struct device_queue_manager *dqm)
 {
-	BUG_ON(!dqm || !dqm->dev);
 	return dqm->dev->shared_resources.num_pipe_per_mec;
 }
 
@@ -152,8 +149,6 @@ static int create_queue_nocpsch(struct device_queue_manager *dqm,
 {
 	int retval;
 
-	BUG_ON(!dqm || !q || !qpd || !allocated_vmid);
-
 	print_queue(q);
 
 	mutex_lock(&dqm->lock);
@@ -259,8 +254,6 @@ static int create_compute_queue_nocpsch(struct device_queue_manager *dqm,
 	int retval;
 	struct mqd_manager *mqd;
 
-	BUG_ON(!dqm || !q || !qpd);
-
 	mqd = dqm->ops.get_mqd_manager(dqm, KFD_MQD_TYPE_COMPUTE);
 	if (!mqd)
 		return -ENOMEM;
@@ -299,8 +292,6 @@ static int destroy_queue_nocpsch(struct device_queue_manager *dqm,
 	int retval;
 	struct mqd_manager *mqd;
 
-	BUG_ON(!dqm || !q || !q->mqd || !qpd);
-
 	retval = 0;
 
 	mutex_lock(&dqm->lock);
@@ -362,8 +353,6 @@ static int update_queue(struct device_queue_manager *dqm, struct queue *q)
 	struct mqd_manager *mqd;
 	bool prev_active = false;
 
-	BUG_ON(!dqm || !q || !q->mqd);
-
 	mutex_lock(&dqm->lock);
 	mqd = dqm->ops.get_mqd_manager(dqm,
 			get_mqd_type_from_queue_type(q->properties.type));
@@ -399,7 +388,7 @@ static struct mqd_manager *get_mqd_manager_nocpsch(
 {
 	struct mqd_manager *mqd;
 
-	BUG_ON(!dqm || type >= KFD_MQD_TYPE_MAX);
+	BUG_ON(type >= KFD_MQD_TYPE_MAX);
 
 	pr_debug("mqd type %d\n", type);
 
@@ -420,8 +409,6 @@ static int register_process_nocpsch(struct device_queue_manager *dqm,
 	struct device_process_node *n;
 	int retval;
 
-	BUG_ON(!dqm || !qpd);
-
 	n = kzalloc(sizeof(*n), GFP_KERNEL);
 	if (!n)
 		return -ENOMEM;
@@ -446,8 +433,6 @@ static int unregister_process_nocpsch(struct device_queue_manager *dqm,
 	int retval;
 	struct device_process_node *cur, *next;
 
-	BUG_ON(!dqm || !qpd);
-
 	pr_debug("qpd->queues_list is %s\n",
 			list_empty(&qpd->queues_list) ? "empty" : "not empty");
 
@@ -488,8 +473,6 @@ static void init_interrupts(struct device_queue_manager *dqm)
 {
 	unsigned int i;
 
-	BUG_ON(!dqm);
-
 	for (i = 0 ; i < get_pipes_per_mec(dqm) ; i++)
 		if (is_pipe_enabled(dqm, 0, i))
 			dqm->dev->kfd2kgd->init_interrupts(dqm->dev->kgd, i);
@@ -499,8 +482,6 @@ static int initialize_nocpsch(struct device_queue_manager *dqm)
 {
 	int pipe, queue;
 
-	BUG_ON(!dqm);
-
 	pr_debug("num of pipes: %d\n", get_pipes_per_mec(dqm));
 
 	dqm->allocated_queues = kcalloc(get_pipes_per_mec(dqm),
@@ -532,8 +513,6 @@ static void uninitialize_nocpsch(struct device_queue_manager *dqm)
 {
 	int i;
 
-	BUG_ON(!dqm);
-
 	BUG_ON(dqm->queue_count > 0 || dqm->processes_count > 0);
 
 	kfree(dqm->allocated_queues);
@@ -631,8 +610,6 @@ static int set_sched_resources(struct device_queue_manager *dqm)
 	int i, mec;
 	struct scheduling_resources res;
 
-	BUG_ON(!dqm);
-
 	res.vmid_mask = (1 << VMID_PER_DEVICE) - 1;
 	res.vmid_mask <<= KFD_VMID_START_OFFSET;
 
@@ -674,8 +651,6 @@ static int initialize_cpsch(struct device_queue_manager *dqm)
 {
 	int retval;
 
-	BUG_ON(!dqm);
-
 	pr_debug("num of pipes: %d\n", get_pipes_per_mec(dqm));
 
 	mutex_init(&dqm->lock);
@@ -695,8 +670,6 @@ static int start_cpsch(struct device_queue_manager *dqm)
 	struct device_process_node *node;
 	int retval;
 
-	BUG_ON(!dqm);
-
 	retval = 0;
 
 	retval = pm_init(&dqm->packets, dqm);
@@ -741,8 +714,6 @@ static int stop_cpsch(struct device_queue_manager *dqm)
 	struct device_process_node *node;
 	struct kfd_process_device *pdd;
 
-	BUG_ON(!dqm);
-
 	destroy_queues_cpsch(dqm, true, true);
 
 	list_for_each_entry(node, &dqm->queues, list) {
@@ -759,8 +730,6 @@ static int create_kernel_queue_cpsch(struct device_queue_manager *dqm,
 					struct kernel_queue *kq,
 					struct qcm_process_device *qpd)
 {
-	BUG_ON(!dqm || !kq || !qpd);
-
 	mutex_lock(&dqm->lock);
 	if (dqm->total_queue_count >= max_num_of_queues_per_device) {
 		pr_warn("Can't create new kernel queue because %d queues were already created\n",
@@ -790,8 +759,6 @@ static void destroy_kernel_queue_cpsch(struct device_queue_manager *dqm,
 					struct kernel_queue *kq,
 					struct qcm_process_device *qpd)
 {
-	BUG_ON(!dqm || !kq);
-
 	mutex_lock(&dqm->lock);
 	/* here we actually preempt the DIQ */
 	destroy_queues_cpsch(dqm, true, false);
@@ -823,8 +790,6 @@ static int create_queue_cpsch(struct device_queue_manager *dqm, struct queue *q,
 	int retval;
 	struct mqd_manager *mqd;
 
-	BUG_ON(!dqm || !q || !qpd);
-
 	retval = 0;
 
 	if (allocate_vmid)
@@ -882,7 +847,6 @@ int amdkfd_fence_wait_timeout(unsigned int *fence_addr,
 				unsigned int fence_value,
 				unsigned long timeout)
 {
-	BUG_ON(!fence_addr);
 	timeout += jiffies;
 
 	while (*fence_addr != fence_value) {
@@ -911,8 +875,6 @@ static int destroy_queues_cpsch(struct device_queue_manager *dqm,
 	enum kfd_preempt_type_filter preempt_type;
 	struct kfd_process_device *pdd;
 
-	BUG_ON(!dqm);
-
 	retval = 0;
 
 	if (lock)
@@ -962,8 +924,6 @@ static int execute_queues_cpsch(struct device_queue_manager *dqm, bool lock)
 {
 	int retval;
 
-	BUG_ON(!dqm);
-
 	if (lock)
 		mutex_lock(&dqm->lock);
 
@@ -1004,8 +964,6 @@ static int destroy_queue_cpsch(struct device_queue_manager *dqm,
 	struct mqd_manager *mqd;
 	bool preempt_all_queues;
 
-	BUG_ON(!dqm || !qpd || !q);
-
 	preempt_all_queues = false;
 
 	retval = 0;
@@ -1131,8 +1089,6 @@ struct device_queue_manager *device_queue_manager_init(struct kfd_dev *dev)
 {
 	struct device_queue_manager *dqm;
 
-	BUG_ON(!dev);
-
 	pr_debug("Loading device queue manager\n");
 
 	dqm = kzalloc(sizeof(*dqm), GFP_KERNEL);
@@ -1197,8 +1153,6 @@ struct device_queue_manager *device_queue_manager_init(struct kfd_dev *dev)
 
 void device_queue_manager_uninit(struct device_queue_manager *dqm)
 {
-	BUG_ON(!dqm);
-
 	dqm->ops.uninitialize(dqm);
 	kfree(dqm);
 }

drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager_cik.c

@@ -104,8 +104,6 @@ static int register_process_cik(struct device_queue_manager *dqm,
 	struct kfd_process_device *pdd;
 	unsigned int temp;
 
-	BUG_ON(!dqm || !qpd);
-
 	pdd = qpd_to_pdd(qpd);
 
 	/* check if sh_mem_config register already configured */

drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager_vi.c

@@ -110,8 +110,6 @@ static int register_process_vi(struct device_queue_manager *dqm,
 	struct kfd_process_device *pdd;
 	unsigned int temp;
 
-	BUG_ON(!dqm || !qpd);
-
 	pdd = qpd_to_pdd(qpd);
 
 	/* check if sh_mem_config register already configured */

drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c

@@ -165,8 +165,6 @@ u32 __iomem *kfd_get_kernel_doorbell(struct kfd_dev *kfd,
 {
 	u32 inx;
 
-	BUG_ON(!kfd || !doorbell_off);
-
 	mutex_lock(&kfd->doorbell_mutex);
 	inx = find_first_zero_bit(kfd->doorbell_available_index,
 					KFD_MAX_NUM_OF_QUEUES_PER_PROCESS);
@@ -196,8 +194,6 @@ void kfd_release_kernel_doorbell(struct kfd_dev *kfd, u32 __iomem *db_addr)
 {
 	unsigned int inx;
 
-	BUG_ON(!kfd || !db_addr);
-
 	inx = (unsigned int)(db_addr - kfd->doorbell_kernel_ptr);
 
 	mutex_lock(&kfd->doorbell_mutex);

drivers/gpu/drm/amd/amdkfd/kfd_kernel_queue.c

@@ -41,7 +41,6 @@ static bool initialize(struct kernel_queue *kq, struct kfd_dev *dev,
 	int retval;
 	union PM4_MES_TYPE_3_HEADER nop;
 
-	BUG_ON(!kq || !dev);
 	BUG_ON(type != KFD_QUEUE_TYPE_DIQ && type != KFD_QUEUE_TYPE_HIQ);
 
 	pr_debug("Initializing queue type %d size %d\n", KFD_QUEUE_TYPE_HIQ,
@@ -180,8 +179,6 @@ static bool initialize(struct kernel_queue *kq, struct kfd_dev *dev,
 
 static void uninitialize(struct kernel_queue *kq)
 {
-	BUG_ON(!kq);
-
 	if (kq->queue->properties.type == KFD_QUEUE_TYPE_HIQ)
 		kq->mqd->destroy_mqd(kq->mqd,
 					NULL,
@@ -211,8 +208,6 @@ static int acquire_packet_buffer(struct kernel_queue *kq,
 	uint32_t wptr, rptr;
 	unsigned int *queue_address;
 
-	BUG_ON(!kq || !buffer_ptr);
-
 	rptr = *kq->rptr_kernel;
 	wptr = *kq->wptr_kernel;
 	queue_address = (unsigned int *)kq->pq_kernel_addr;
@@ -252,11 +247,7 @@ static void submit_packet(struct kernel_queue *kq)
 {
 #ifdef DEBUG
 	int i;
-#endif
-
-	BUG_ON(!kq);
 
-#ifdef DEBUG
 	for (i = *kq->wptr_kernel; i < kq->pending_wptr; i++) {
 		pr_debug("0x%2X ", kq->pq_kernel_addr[i]);
 		if (i % 15 == 0)
@@ -272,7 +263,6 @@ static void submit_packet(struct kernel_queue *kq)
 
 static void rollback_packet(struct kernel_queue *kq)
 {
-	BUG_ON(!kq);
 	kq->pending_wptr = *kq->queue->properties.write_ptr;
 }
 
@@ -281,8 +271,6 @@ struct kernel_queue *kernel_queue_init(struct kfd_dev *dev,
 {
 	struct kernel_queue *kq;
 
-	BUG_ON(!dev);
-
 	kq = kzalloc(sizeof(*kq), GFP_KERNEL);
 	if (!kq)
 		return NULL;
@@ -313,8 +301,6 @@ struct kernel_queue *kernel_queue_init(struct kfd_dev *dev,
 
 void kernel_queue_uninit(struct kernel_queue *kq)
 {
-	BUG_ON(!kq);
-
 	kq->ops.uninitialize(kq);
 	kfree(kq);
 }
@@ -325,8 +311,6 @@ static __attribute__((unused)) void test_kq(struct kfd_dev *dev)
 	uint32_t *buffer, i;
 	int retval;
 
-	BUG_ON(!dev);
-
 	pr_err("Starting kernel queue test\n");
 
 	kq = kernel_queue_init(dev, KFD_QUEUE_TYPE_HIQ);

drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_cik.c

@@ -44,8 +44,6 @@ static int init_mqd(struct mqd_manager *mm, void **mqd,
 	struct cik_mqd *m;
 	int retval;
 
-	BUG_ON(!mm || !q || !mqd);
-
 	retval = kfd_gtt_sa_allocate(mm->dev, sizeof(struct cik_mqd),
 					mqd_mem_obj);
 
@@ -113,8 +111,6 @@ static int init_mqd_sdma(struct mqd_manager *mm, void **mqd,
 	int retval;
 	struct cik_sdma_rlc_registers *m;
 
-	BUG_ON(!mm || !mqd || !mqd_mem_obj);
-
 	retval = kfd_gtt_sa_allocate(mm->dev,
 					sizeof(struct cik_sdma_rlc_registers),
 					mqd_mem_obj);
@@ -138,14 +134,12 @@ static int init_mqd_sdma(struct mqd_manager *mm, void **mqd,
 static void uninit_mqd(struct mqd_manager *mm, void *mqd,
 			struct kfd_mem_obj *mqd_mem_obj)
 {
-	BUG_ON(!mm || !mqd);
 	kfd_gtt_sa_free(mm->dev, mqd_mem_obj);
 }
 
 static void uninit_mqd_sdma(struct mqd_manager *mm, void *mqd,
 				struct kfd_mem_obj *mqd_mem_obj)
 {
-	BUG_ON(!mm || !mqd);
 	kfd_gtt_sa_free(mm->dev, mqd_mem_obj);
 }
 
@@ -168,8 +162,6 @@ static int update_mqd(struct mqd_manager *mm, void *mqd,
 {
 	struct cik_mqd *m;
 
-	BUG_ON(!mm || !q || !mqd);
-
 	m = get_mqd(mqd);
 	m->cp_hqd_pq_control = DEFAULT_RPTR_BLOCK_SIZE |
 				DEFAULT_MIN_AVAIL_SIZE | PQ_ATC_EN;
@@ -209,8 +201,6 @@ static int update_mqd_sdma(struct mqd_manager *mm, void *mqd,
 {
 	struct cik_sdma_rlc_registers *m;
 
-	BUG_ON(!mm || !mqd || !q);
-
 	m = get_sdma_mqd(mqd);
 	m->sdma_rlc_rb_cntl = ffs(q->queue_size / sizeof(unsigned int)) <<
 			SDMA0_RLC0_RB_CNTL__RB_SIZE__SHIFT |
@@ -296,8 +286,6 @@ static int init_mqd_hiq(struct mqd_manager *mm, void **mqd,
 	struct cik_mqd *m;
 	int retval;
 
-	BUG_ON(!mm || !q || !mqd || !mqd_mem_obj);
-
 	retval = kfd_gtt_sa_allocate(mm->dev, sizeof(struct cik_mqd),
 					mqd_mem_obj);
 
@@ -352,8 +340,6 @@ static int update_mqd_hiq(struct mqd_manager *mm, void *mqd,
 {
 	struct cik_mqd *m;
 
-	BUG_ON(!mm || !q || !mqd);
-
 	m = get_mqd(mqd);
 	m->cp_hqd_pq_control = DEFAULT_RPTR_BLOCK_SIZE |
 				DEFAULT_MIN_AVAIL_SIZE |
@@ -391,8 +377,6 @@ struct cik_sdma_rlc_registers *get_sdma_mqd(void *mqd)
 {
 	struct cik_sdma_rlc_registers *m;
 
-	BUG_ON(!mqd);
-
 	m = (struct cik_sdma_rlc_registers *)mqd;
 
 	return m;
@@ -403,7 +387,6 @@ struct mqd_manager *mqd_manager_init_cik(enum KFD_MQD_TYPE type,
 {
 	struct mqd_manager *mqd;
 
-	BUG_ON(!dev);
 	BUG_ON(type >= KFD_MQD_TYPE_MAX);
 
 	mqd = kzalloc(sizeof(*mqd), GFP_KERNEL);

drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_vi.c

@@ -106,8 +106,6 @@ static int __update_mqd(struct mqd_manager *mm, void *mqd,
 {
 	struct vi_mqd *m;
 
-	BUG_ON(!mm || !q || !mqd);
-
 	m = get_mqd(mqd);
 
 	m->cp_hqd_pq_control = 5 << CP_HQD_PQ_CONTROL__RPTR_BLOCK_SIZE__SHIFT |
@@ -186,7 +184,6 @@ static int destroy_mqd(struct mqd_manager *mm, void *mqd,
 static void uninit_mqd(struct mqd_manager *mm, void *mqd,
 			struct kfd_mem_obj *mqd_mem_obj)
 {
-	BUG_ON(!mm || !mqd);
 	kfd_gtt_sa_free(mm->dev, mqd_mem_obj);
 }
 
@@ -236,7 +233,6 @@ struct mqd_manager *mqd_manager_init_vi(enum KFD_MQD_TYPE type,
 {
 	struct mqd_manager *mqd;
 
-	BUG_ON(!dev);
 	BUG_ON(type >= KFD_MQD_TYPE_MAX);
 
 	mqd = kzalloc(sizeof(*mqd), GFP_KERNEL);

drivers/gpu/drm/amd/amdkfd/kfd_packet_manager.c

@@ -58,8 +58,6 @@ static void pm_calc_rlib_size(struct packet_manager *pm,
 	unsigned int process_count, queue_count;
 	unsigned int map_queue_size;
 
-	BUG_ON(!pm || !rlib_size || !over_subscription);
-
 	process_count = pm->dqm->processes_count;
 	queue_count = pm->dqm->queue_count;
 
@@ -96,9 +94,7 @@ static int pm_allocate_runlist_ib(struct packet_manager *pm,
 {
 	int retval;
 
-	BUG_ON(!pm);
 	BUG_ON(pm->allocated);
-	BUG_ON(!is_over_subscription);
 
 	pm_calc_rlib_size(pm, rl_buffer_size, is_over_subscription);
 
@@ -123,7 +119,7 @@ static int pm_create_runlist(struct packet_manager *pm, uint32_t *buffer,
 {
 	struct pm4_runlist *packet;
 
-	BUG_ON(!pm || !buffer || !ib);
+	BUG_ON(!ib);
 
 	packet = (struct pm4_runlist *)buffer;
 
@@ -148,8 +144,6 @@ static int pm_create_map_process(struct packet_manager *pm, uint32_t *buffer,
 	struct queue *cur;
 	uint32_t num_queues;
 
-	BUG_ON(!pm || !buffer || !qpd);
-
 	packet = (struct pm4_map_process *)buffer;
 
 	memset(buffer, 0, sizeof(struct pm4_map_process));
@@ -185,8 +179,6 @@ static int pm_create_map_queue_vi(struct packet_manager *pm, uint32_t *buffer,
 	struct pm4_mes_map_queues *packet;
 	bool use_static = is_static;
 
-	BUG_ON(!pm || !buffer || !q);
-
 	packet = (struct pm4_mes_map_queues *)buffer;
 	memset(buffer, 0, sizeof(struct pm4_map_queues));
 
@@ -247,8 +239,6 @@ static int pm_create_map_queue(struct packet_manager *pm, uint32_t *buffer,
 	struct pm4_map_queues *packet;
 	bool use_static = is_static;
 
-	BUG_ON(!pm || !buffer || !q);
-
 	packet = (struct pm4_map_queues *)buffer;
 	memset(buffer, 0, sizeof(struct pm4_map_queues));
 
@@ -315,8 +305,6 @@ static int pm_create_runlist_ib(struct packet_manager *pm,
 	struct kernel_queue *kq;
 	bool is_over_subscription;
 
-	BUG_ON(!pm || !queues || !rl_size_bytes || !rl_gpu_addr);
-
 	rl_wptr = retval = proccesses_mapped = 0;
 
 	retval = pm_allocate_runlist_ib(pm, &rl_buffer, rl_gpu_addr,
@@ -416,8 +404,6 @@ static int pm_create_runlist_ib(struct packet_manager *pm,
 
 int pm_init(struct packet_manager *pm, struct device_queue_manager *dqm)
 {
-	BUG_ON(!dqm);
-
 	pm->dqm = dqm;
 	mutex_init(&pm->lock);
 	pm->priv_queue = kernel_queue_init(dqm->dev, KFD_QUEUE_TYPE_HIQ);
@@ -432,8 +418,6 @@ int pm_init(struct packet_manager *pm, struct device_queue_manager *dqm)
 
 void pm_uninit(struct packet_manager *pm)
 {
-	BUG_ON(!pm);
-
 	mutex_destroy(&pm->lock);
 	kernel_queue_uninit(pm->priv_queue);
 }
@@ -444,8 +428,6 @@ int pm_send_set_resources(struct packet_manager *pm,
 	struct pm4_set_resources *packet;
 	int retval = 0;
 
-	BUG_ON(!pm || !res);
-
 	mutex_lock(&pm->lock);
 	pm->priv_queue->ops.acquire_packet_buffer(pm->priv_queue,
 					sizeof(*packet) / sizeof(uint32_t),
@@ -489,8 +471,6 @@ int pm_send_runlist(struct packet_manager *pm, struct list_head *dqm_queues)
 	size_t rl_ib_size, packet_size_dwords;
 	int retval;
 
-	BUG_ON(!pm || !dqm_queues);
-
 	retval = pm_create_runlist_ib(pm, dqm_queues, &rl_gpu_ib_addr,
 					&rl_ib_size);
 	if (retval)
@@ -532,7 +512,7 @@ int pm_send_query_status(struct packet_manager *pm, uint64_t fence_address,
 	int retval;
 	struct pm4_query_status *packet;
 
-	BUG_ON(!pm || !fence_address);
+	BUG_ON(!fence_address);
 
 	mutex_lock(&pm->lock);
 	retval = pm->priv_queue->ops.acquire_packet_buffer(
@@ -572,8 +552,6 @@ int pm_send_unmap_queue(struct packet_manager *pm, enum kfd_queue_type type,
 	uint32_t *buffer;
 	struct pm4_unmap_queues *packet;
 
-	BUG_ON(!pm);
-
 	mutex_lock(&pm->lock);
 	retval = pm->priv_queue->ops.acquire_packet_buffer(
 			pm->priv_queue,
@@ -645,8 +623,6 @@ int pm_send_unmap_queue(struct packet_manager *pm, enum kfd_queue_type type,
 
 void pm_release_ib(struct packet_manager *pm)
 {
-	BUG_ON(!pm);
-
 	mutex_lock(&pm->lock);
 	if (pm->allocated) {
 		kfd_gtt_sa_free(pm->dqm->dev, pm->ib_buffer_obj);

drivers/gpu/drm/amd/amdkfd/kfd_process.c

@@ -407,8 +407,6 @@ void kfd_unbind_process_from_device(struct kfd_dev *dev, unsigned int pasid)
 	struct kfd_process *p;
 	struct kfd_process_device *pdd;
 
-	BUG_ON(!dev);
-
 	/*
 	 * Look for the process that matches the pasid. If there is no such
 	 * process, we either released it in amdkfd's own notifier, or there

drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c

@@ -32,8 +32,6 @@ static inline struct process_queue_node *get_queue_by_qid(
 {
 	struct process_queue_node *pqn;
 
-	BUG_ON(!pqm);
-
 	list_for_each_entry(pqn, &pqm->queues, process_queue_list) {
 		if ((pqn->q && pqn->q->properties.queue_id == qid) ||
 		    (pqn->kq && pqn->kq->queue->properties.queue_id == qid))
@@ -48,8 +46,6 @@ static int find_available_queue_slot(struct process_queue_manager *pqm,
 {
 	unsigned long found;
 
-	BUG_ON(!pqm || !qid);
-
 	found = find_first_zero_bit(pqm->queue_slot_bitmap,
 			KFD_MAX_NUM_OF_QUEUES_PER_PROCESS);
 
@@ -69,8 +65,6 @@ static int find_available_queue_slot(struct process_queue_manager *pqm,
 
 int pqm_init(struct process_queue_manager *pqm, struct kfd_process *p)
 {
-	BUG_ON(!pqm);
-
 	INIT_LIST_HEAD(&pqm->queues);
 	pqm->queue_slot_bitmap =
 			kzalloc(DIV_ROUND_UP(KFD_MAX_NUM_OF_QUEUES_PER_PROCESS,
@@ -87,8 +81,6 @@ void pqm_uninit(struct process_queue_manager *pqm)
 	int retval;
 	struct process_queue_node *pqn, *next;
 
-	BUG_ON(!pqm);
-
 	list_for_each_entry_safe(pqn, next, &pqm->queues, process_queue_list) {
 		retval = pqm_destroy_queue(
 				pqm,
@@ -151,8 +143,6 @@ int pqm_create_queue(struct process_queue_manager *pqm,
 	int num_queues = 0;
 	struct queue *cur;
 
-	BUG_ON(!pqm || !dev || !properties || !qid);
-
 	memset(&q_properties, 0, sizeof(struct queue_properties));
 	memcpy(&q_properties, properties, sizeof(struct queue_properties));
 	q = NULL;
@@ -269,7 +259,6 @@ int pqm_destroy_queue(struct process_queue_manager *pqm, unsigned int qid)
 
 	dqm = NULL;
 
-	BUG_ON(!pqm);
 	retval = 0;
 
 	pqn = get_queue_by_qid(pqm, qid);
@@ -323,8 +312,6 @@ int pqm_update_queue(struct process_queue_manager *pqm, unsigned int qid,
 	int retval;
 	struct process_queue_node *pqn;
 
-	BUG_ON(!pqm);
-
 	pqn = get_queue_by_qid(pqm, qid);
 	if (!pqn) {
 		pr_debug("No queue %d exists for update operation\n", qid);
@@ -350,8 +337,6 @@ struct kernel_queue *pqm_get_kernel_queue(
 {
 	struct process_queue_node *pqn;
 
-	BUG_ON(!pqm);
-
 	pqn = get_queue_by_qid(pqm, qid);
 	if (pqn && pqn->kq)
 		return pqn->kq;

drivers/gpu/drm/amd/amdkfd/kfd_queue.c

@@ -67,8 +67,6 @@ int init_queue(struct queue **q, const struct queue_properties *properties)
 {
 	struct queue *tmp_q;
 
-	BUG_ON(!q);
-
 	tmp_q = kzalloc(sizeof(*tmp_q), GFP_KERNEL);
 	if (!tmp_q)
 		return -ENOMEM;

drivers/gpu/drm/amd/amdkfd/kfd_topology.c

@@ -108,9 +108,6 @@ static int kfd_topology_get_crat_acpi(void *crat_image, size_t *size)
 static void kfd_populated_cu_info_cpu(struct kfd_topology_device *dev,
 		struct crat_subtype_computeunit *cu)
 {
-	BUG_ON(!dev);
-	BUG_ON(!cu);
-
 	dev->node_props.cpu_cores_count = cu->num_cpu_cores;
 	dev->node_props.cpu_core_id_base = cu->processor_id_low;
 	if (cu->hsa_capability & CRAT_CU_FLAGS_IOMMU_PRESENT)
@@ -123,9 +120,6 @@ static void kfd_populated_cu_info_cpu(struct kfd_topology_device *dev,
 static void kfd_populated_cu_info_gpu(struct kfd_topology_device *dev,
 		struct crat_subtype_computeunit *cu)
 {
-	BUG_ON(!dev);
-	BUG_ON(!cu);
-
 	dev->node_props.simd_id_base = cu->processor_id_low;
 	dev->node_props.simd_count = cu->num_simd_cores;
 	dev->node_props.lds_size_in_kb = cu->lds_size_in_kb;
@@ -148,8 +142,6 @@ static int kfd_parse_subtype_cu(struct crat_subtype_computeunit *cu)
 	struct kfd_topology_device *dev;
 	int i = 0;
 
-	BUG_ON(!cu);
-
 	pr_info("Found CU entry in CRAT table with proximity_domain=%d caps=%x\n",
 			cu->proximity_domain, cu->hsa_capability);
 	list_for_each_entry(dev, &topology_device_list, list) {
@@ -177,8 +169,6 @@ static int kfd_parse_subtype_mem(struct crat_subtype_memory *mem)
 	struct kfd_topology_device *dev;
 	int i = 0;
 
-	BUG_ON(!mem);
-
 	pr_info("Found memory entry in CRAT table with proximity_domain=%d\n",
 			mem->promixity_domain);
 	list_for_each_entry(dev, &topology_device_list, list) {
@@ -223,8 +213,6 @@ static int kfd_parse_subtype_cache(struct crat_subtype_cache *cache)
 	struct kfd_topology_device *dev;
 	uint32_t id;
 
-	BUG_ON(!cache);
-
 	id = cache->processor_id_low;
 
 	pr_info("Found cache entry in CRAT table with processor_id=%d\n", id);
@@ -274,8 +262,6 @@ static int kfd_parse_subtype_iolink(struct crat_subtype_iolink *iolink)
 	uint32_t id_from;
 	uint32_t id_to;
 
-	BUG_ON(!iolink);
-
 	id_from = iolink->proximity_domain_from;
 	id_to = iolink->proximity_domain_to;
 
@@ -323,8 +309,6 @@ static int kfd_parse_subtype(struct crat_subtype_generic *sub_type_hdr)
 	struct crat_subtype_iolink *iolink;
 	int ret = 0;
 
-	BUG_ON(!sub_type_hdr);
-
 	switch (sub_type_hdr->type) {
 	case CRAT_SUBTYPE_COMPUTEUNIT_AFFINITY:
 		cu = (struct crat_subtype_computeunit *)sub_type_hdr;
@@ -368,8 +352,6 @@ static void kfd_release_topology_device(struct kfd_topology_device *dev)
 	struct kfd_cache_properties *cache;
 	struct kfd_iolink_properties *iolink;
 
-	BUG_ON(!dev);
-
 	list_del(&dev->list);
 
 	while (dev->mem_props.next != &dev->mem_props) {
@@ -763,8 +745,6 @@ static void kfd_remove_sysfs_node_entry(struct kfd_topology_device *dev)
 	struct kfd_cache_properties *cache;
 	struct kfd_mem_properties *mem;
 
-	BUG_ON(!dev);
-
 	if (dev->kobj_iolink) {
 		list_for_each_entry(iolink, &dev->io_link_props, list)
 			if (iolink->kobj) {
@@ -819,8 +799,6 @@ static int kfd_build_sysfs_node_entry(struct kfd_topology_device *dev,
 	int ret;
 	uint32_t i;
 
-	BUG_ON(!dev);
-
 	/*
 	 * Creating the sysfs folders
 	 */
@@ -1117,8 +1095,6 @@ static struct kfd_topology_device *kfd_assign_gpu(struct kfd_dev *gpu)
 	struct kfd_topology_device *dev;
 	struct kfd_topology_device *out_dev = NULL;
 
-	BUG_ON(!gpu);
-
 	list_for_each_entry(dev, &topology_device_list, list)
 		if (!dev->gpu && (dev->node_props.simd_count > 0)) {
 			dev->gpu = gpu;
@@ -1143,8 +1119,6 @@ int kfd_topology_add_device(struct kfd_dev *gpu)
 	struct kfd_topology_device *dev;
 	int res;
 
-	BUG_ON(!gpu);
-
 	gpu_id = kfd_generate_gpu_id(gpu);
 
 	pr_debug("Adding new GPU (ID: 0x%x) to topology\n", gpu_id);
@@ -1210,8 +1184,6 @@ int kfd_topology_remove_device(struct kfd_dev *gpu)
 	uint32_t gpu_id;
 	int res = -ENODEV;
 
-	BUG_ON(!gpu);
-
 	down_write(&topology_lock);
 
 	list_for_each_entry(dev, &topology_device_list, list)