cciss: switch to using hlist for command list management

This both cleans up the code and also helps detect the spurious case
of a command attempted being removed from a queue it doesn't belong
to.
Acked-by: Mike Miller <mike.miller@hp.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

drivers/block/cciss.c

@@ -215,31 +215,17 @@ static struct block_device_operations cciss_fops = {
 /*
  * Enqueuing and dequeuing functions for cmdlists.
  */
-static inline void addQ(CommandList_struct **Qptr, CommandList_struct *c)
+static inline void addQ(struct hlist_head *list, CommandList_struct *c)
 {
-	if (*Qptr == NULL) {
-		*Qptr = c;
-		c->next = c->prev = c;
-	} else {
-		c->prev = (*Qptr)->prev;
-		c->next = (*Qptr);
-		(*Qptr)->prev->next = c;
-		(*Qptr)->prev = c;
-	}
+	hlist_add_head(&c->list, list);
 }
 
-static inline CommandList_struct *removeQ(CommandList_struct **Qptr,
-					  CommandList_struct *c)
+static inline void removeQ(CommandList_struct *c)
 {
-	if (c && c->next != c) {
-		if (*Qptr == c)
-			*Qptr = c->next;
-		c->prev->next = c->next;
-		c->next->prev = c->prev;
-	} else {
-		*Qptr = NULL;
-	}
-	return c;
+	if (WARN_ON(hlist_unhashed(&c->list)))
+		return;
+
+	hlist_del_init(&c->list);
 }
 
 #include "cciss_scsi.c"		/* For SCSI tape support */
@@ -506,6 +492,7 @@ static CommandList_struct *cmd_alloc(ctlr_info_t *h, int get_from_pool)
 		c->cmdindex = i;
 	}
 
+	INIT_HLIST_NODE(&c->list);
 	c->busaddr = (__u32) cmd_dma_handle;
 	temp64.val = (__u64) err_dma_handle;
 	c->ErrDesc.Addr.lower = temp64.val32.lower;
@@ -2548,7 +2535,8 @@ static void start_io(ctlr_info_t *h)
 {
 	CommandList_struct *c;
 
-	while ((c = h->reqQ) != NULL) {
+	while (!hlist_empty(&h->reqQ)) {
+		c = hlist_entry(h->reqQ.first, CommandList_struct, list);
 		/* can't do anything if fifo is full */
 		if ((h->access.fifo_full(h))) {
 			printk(KERN_WARNING "cciss: fifo full\n");
@@ -2556,14 +2544,14 @@ static void start_io(ctlr_info_t *h)
 		}
 
 		/* Get the first entry from the Request Q */
-		removeQ(&(h->reqQ), c);
+		removeQ(c);
 		h->Qdepth--;
 
 		/* Tell the controller execute command */
 		h->access.submit_command(h, c);
 
 		/* Put job onto the completed Q */
-		addQ(&(h->cmpQ), c);
+		addQ(&h->cmpQ, c);
 	}
 }
 
@@ -2576,7 +2564,7 @@ static inline void resend_cciss_cmd(ctlr_info_t *h, CommandList_struct *c)
 	memset(c->err_info, 0, sizeof(ErrorInfo_struct));
 
 	/* add it to software queue and then send it to the controller */
-	addQ(&(h->reqQ), c);
+	addQ(&h->reqQ, c);
 	h->Qdepth++;
 	if (h->Qdepth > h->maxQsinceinit)
 		h->maxQsinceinit = h->Qdepth;
@@ -2897,7 +2885,7 @@ static void do_cciss_request(struct request_queue *q)
 
 	spin_lock_irq(q->queue_lock);
 
-	addQ(&(h->reqQ), c);
+	addQ(&h->reqQ, c);
 	h->Qdepth++;
 	if (h->Qdepth > h->maxQsinceinit)
 		h->maxQsinceinit = h->Qdepth;
@@ -2985,16 +2973,12 @@ static irqreturn_t do_cciss_intr(int irq, void *dev_id)
 				a = c->busaddr;
 
 			} else {
+				struct hlist_node *tmp;
+
 				a &= ~3;
-				if ((c = h->cmpQ) == NULL) {
-					printk(KERN_WARNING
-					       "cciss: Completion of %08x ignored\n",
-					       a1);
-					continue;
-				}
-				while (c->busaddr != a) {
-					c = c->next;
-					if (c == h->cmpQ)
+				c = NULL;
+				hlist_for_each_entry(c, tmp, &h->cmpQ, list) {
+					if (c->busaddr == a)
 						break;
 				}
 			}
@@ -3002,8 +2986,8 @@ static irqreturn_t do_cciss_intr(int irq, void *dev_id)
 			 * If we've found the command, take it off the
 			 * completion Q and free it
 			 */
-			if (c->busaddr == a) {
-				removeQ(&h->cmpQ, c);
+			if (c && c->busaddr == a) {
+				removeQ(c);
 				if (c->cmd_type == CMD_RWREQ) {
 					complete_command(h, c, 0);
 				} else if (c->cmd_type == CMD_IOCTL_PEND) {
@@ -3423,6 +3407,8 @@ static int __devinit cciss_init_one(struct pci_dev *pdev,
 		return -1;
 
 	hba[i]->busy_initializing = 1;
+	INIT_HLIST_HEAD(&hba[i]->cmpQ);
+	INIT_HLIST_HEAD(&hba[i]->reqQ);
 
 	if (cciss_pci_init(hba[i], pdev) != 0)
 		goto clean1;
@@ -3730,15 +3716,17 @@ static void fail_all_cmds(unsigned long ctlr)
 	pci_disable_device(h->pdev);	/* Make sure it is really dead. */
 
 	/* move everything off the request queue onto the completed queue */
-	while ((c = h->reqQ) != NULL) {
-		removeQ(&(h->reqQ), c);
+	while (!hlist_empty(&h->reqQ)) {
+		c = hlist_entry(h->reqQ.first, CommandList_struct, list);
+		removeQ(c);
 		h->Qdepth--;
-		addQ(&(h->cmpQ), c);
+		addQ(&h->cmpQ, c);
 	}
 
 	/* Now, fail everything on the completed queue with a HW error */
-	while ((c = h->cmpQ) != NULL) {
-		removeQ(&h->cmpQ, c);
+	while (!hlist_empty(&h->cmpQ)) {
+		c = hlist_entry(h->cmpQ.first, CommandList_struct, list);
+		removeQ(c);
 		c->err_info->CommandStatus = CMD_HARDWARE_ERR;
 		if (c->cmd_type == CMD_RWREQ) {
 			complete_command(h, c, 0);

drivers/block/cciss.h

@@ -89,8 +89,8 @@ struct ctlr_info
 	struct access_method access;
 
 	/* queue and queue Info */ 
-	CommandList_struct *reqQ;
-	CommandList_struct  *cmpQ;
+	struct hlist_head reqQ;
+	struct hlist_head cmpQ;
 	unsigned int Qdepth;
 	unsigned int maxQsinceinit;
 	unsigned int maxSG;

drivers/block/cciss_cmd.h

@@ -265,8 +265,7 @@ typedef struct _CommandList_struct {
   int			   ctlr;
   int			   cmd_type; 
   long			   cmdindex;
-  struct _CommandList_struct *prev;
-  struct _CommandList_struct *next;
+  struct hlist_node list;
   struct request *	   rq;
   struct completion *waiting;
   int	 retry_count;