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Commit 7fb23a78 authored by Damien Le Moal's avatar Damien Le Moal Committed by Martin K. Petersen
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scsi: pm8001: Fix tag values handling 

The function pm8001_tag_alloc() determines free tags using the function
find_first_zero_bit() which can return 0 when the first bit of the bitmap
being inspected is 0. As such, tag 0 is a valid tag value that should not
be dismissed as invalid. Fix the functions pm8001_work_fn(),
mpi_sata_completion(), pm8001_mpi_task_abort_resp() and
pm8001_open_reject_retry() to not dismiss 0 tags as invalid.

The value 0xffffffff is used for invalid tags for unused ccb information
structures. Add the macro definition PM8001_INVALID_TAG to define this
value.

Link: https://lore.kernel.org/r/20220220031810.738362-20-damien.lemoal@opensource.wdc.comReviewed-by: default avatarJack Wang <jinpu.wang@ionos.com>
Signed-off-by: default avatarDamien Le Moal <damien.lemoal@opensource.wdc.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 7e6b7e74
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Showing with 28 additions and 47 deletions
drivers/scsi/pm8001/pm8001_hwi.c
View file @ 7fb23a78
......@@ -1522,7 +1522,6 @@ void pm8001_work_fn(struct work_struct *work)
case IO_XFER_ERROR_BREAK:
{ /* This one stashes the sas_task instead */
struct sas_task *t = (struct sas_task *)pm8001_dev;
u32 tag;
struct pm8001_ccb_info *ccb;
struct pm8001_hba_info *pm8001_ha = pw->pm8001_ha;
unsigned long flags, flags1;
......@@ -1544,8 +1543,8 @@ void pm8001_work_fn(struct work_struct *work)
/* Search for a possible ccb that matches the task */
for (i = 0; ccb = NULL, i < PM8001_MAX_CCB; i++) {
ccb = &pm8001_ha->ccb_info[i];
tag = ccb->ccb_tag;
if ((tag != 0xFFFFFFFF) && (ccb->task == t))
if ((ccb->ccb_tag != PM8001_INVALID_TAG) &&
(ccb->task == t))
break;
}
if (!ccb) {
......@@ -1566,11 +1565,11 @@ void pm8001_work_fn(struct work_struct *work)
spin_unlock_irqrestore(&t->task_state_lock, flags1);
pm8001_dbg(pm8001_ha, FAIL, "task 0x%p done with event 0x%x resp 0x%x stat 0x%x but aborted by upper layer!\n",
t, pw->handler, ts->resp, ts->stat);
pm8001_ccb_task_free(pm8001_ha, t, ccb, tag);
pm8001_ccb_task_free(pm8001_ha, t, ccb, ccb->ccb_tag);
spin_unlock_irqrestore(&pm8001_ha->lock, flags);
} else {
spin_unlock_irqrestore(&t->task_state_lock, flags1);
pm8001_ccb_task_free(pm8001_ha, t, ccb, tag);
pm8001_ccb_task_free(pm8001_ha, t, ccb, ccb->ccb_tag);
mb();/* in order to force CPU ordering */
spin_unlock_irqrestore(&pm8001_ha->lock, flags);
t->task_done(t);
......@@ -1579,7 +1578,6 @@ void pm8001_work_fn(struct work_struct *work)
case IO_XFER_OPEN_RETRY_TIMEOUT:
{ /* This one stashes the sas_task instead */
struct sas_task *t = (struct sas_task *)pm8001_dev;
u32 tag;
struct pm8001_ccb_info *ccb;
struct pm8001_hba_info *pm8001_ha = pw->pm8001_ha;
unsigned long flags, flags1;
......@@ -1613,8 +1611,8 @@ void pm8001_work_fn(struct work_struct *work)
/* Search for a possible ccb that matches the task */
for (i = 0; ccb = NULL, i < PM8001_MAX_CCB; i++) {
ccb = &pm8001_ha->ccb_info[i];
tag = ccb->ccb_tag;
if ((tag != 0xFFFFFFFF) && (ccb->task == t))
if ((ccb->ccb_tag != PM8001_INVALID_TAG) &&
(ccb->task == t))
break;
}
if (!ccb) {
......@@ -1685,19 +1683,13 @@ void pm8001_work_fn(struct work_struct *work)
struct task_status_struct *ts;
struct sas_task *task;
int i;
u32 tag, device_id;
u32 device_id;
for (i = 0; ccb = NULL, i < PM8001_MAX_CCB; i++) {
ccb = &pm8001_ha->ccb_info[i];
task = ccb->task;
ts = &task->task_status;
tag = ccb->ccb_tag;
/* check if tag is NULL */
if (!tag) {
pm8001_dbg(pm8001_ha, FAIL,
"tag Null\n");
continue;
}
if (task != NULL) {
dev = task->dev;
if (!dev) {
......@@ -1706,10 +1698,11 @@ void pm8001_work_fn(struct work_struct *work)
continue;
}
/*complete sas task and update to top layer */
pm8001_ccb_task_free(pm8001_ha, task, ccb, tag);
pm8001_ccb_task_free(pm8001_ha, task, ccb,
ccb->ccb_tag);
ts->resp = SAS_TASK_COMPLETE;
task->task_done(task);
} else if (tag != 0xFFFFFFFF) {
} else if (ccb->ccb_tag != PM8001_INVALID_TAG) {
/* complete the internal commands/non-sas task */
pm8001_dev = ccb->device;
if (pm8001_dev->dcompletion) {
......@@ -1717,7 +1710,7 @@ void pm8001_work_fn(struct work_struct *work)
pm8001_dev->dcompletion = NULL;
}
complete(pm8001_ha->nvmd_completion);
pm8001_tag_free(pm8001_ha, tag);
pm8001_tag_free(pm8001_ha, ccb->ccb_tag);
}
}
/* Deregister all the device ids */
......@@ -2313,11 +2306,6 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
param = le32_to_cpu(psataPayload->param);
tag = le32_to_cpu(psataPayload->tag);
if (!tag) {
pm8001_dbg(pm8001_ha, FAIL, "tag null\n");
return;
}
ccb = &pm8001_ha->ccb_info[tag];
t = ccb->task;
pm8001_dev = ccb->device;
......@@ -3051,7 +3039,7 @@ void pm8001_mpi_set_dev_state_resp(struct pm8001_hba_info *pm8001_ha,
device_id, pds, nds, status);
complete(pm8001_dev->setds_completion);
ccb->task = NULL;
ccb->ccb_tag = 0xFFFFFFFF;
ccb->ccb_tag = PM8001_INVALID_TAG;
pm8001_tag_free(pm8001_ha, tag);
}
......@@ -3069,7 +3057,7 @@ void pm8001_mpi_set_nvmd_resp(struct pm8001_hba_info *pm8001_ha, void *piomb)
dlen_status);
}
ccb->task = NULL;
ccb->ccb_tag = 0xFFFFFFFF;
ccb->ccb_tag = PM8001_INVALID_TAG;
pm8001_tag_free(pm8001_ha, tag);
}
......@@ -3096,7 +3084,7 @@ pm8001_mpi_get_nvmd_resp(struct pm8001_hba_info *pm8001_ha, void *piomb)
* freed by requesting path anywhere.
*/
ccb->task = NULL;
ccb->ccb_tag = 0xFFFFFFFF;
ccb->ccb_tag = PM8001_INVALID_TAG;
pm8001_tag_free(pm8001_ha, tag);
return;
}
......@@ -3142,7 +3130,7 @@ pm8001_mpi_get_nvmd_resp(struct pm8001_hba_info *pm8001_ha, void *piomb)
complete(pm8001_ha->nvmd_completion);
pm8001_dbg(pm8001_ha, MSG, "Get nvmd data complete!\n");
ccb->task = NULL;
ccb->ccb_tag = 0xFFFFFFFF;
ccb->ccb_tag = PM8001_INVALID_TAG;
pm8001_tag_free(pm8001_ha, tag);
}
......@@ -3555,7 +3543,7 @@ int pm8001_mpi_reg_resp(struct pm8001_hba_info *pm8001_ha, void *piomb)
}
complete(pm8001_dev->dcompletion);
ccb->task = NULL;
ccb->ccb_tag = 0xFFFFFFFF;
ccb->ccb_tag = PM8001_INVALID_TAG;
pm8001_tag_free(pm8001_ha, htag);
return 0;
}
......@@ -3627,7 +3615,7 @@ int pm8001_mpi_fw_flash_update_resp(struct pm8001_hba_info *pm8001_ha,
}
kfree(ccb->fw_control_context);
ccb->task = NULL;
ccb->ccb_tag = 0xFFFFFFFF;
ccb->ccb_tag = PM8001_INVALID_TAG;
pm8001_tag_free(pm8001_ha, tag);
complete(pm8001_ha->nvmd_completion);
return 0;
......@@ -3663,10 +3651,6 @@ int pm8001_mpi_task_abort_resp(struct pm8001_hba_info *pm8001_ha, void *piomb)
status = le32_to_cpu(pPayload->status);
tag = le32_to_cpu(pPayload->tag);
if (!tag) {
pm8001_dbg(pm8001_ha, FAIL, " TAG NULL. RETURNING !!!\n");
return -1;
}
scp = le32_to_cpu(pPayload->scp);
ccb = &pm8001_ha->ccb_info[tag];
......
drivers/scsi/pm8001/pm8001_init.c
View file @ 7fb23a78
......@@ -1217,10 +1217,11 @@ pm8001_init_ccb_tag(struct pm8001_hba_info *pm8001_ha, struct Scsi_Host *shost,
goto err_out;
}
pm8001_ha->ccb_info[i].task = NULL;
pm8001_ha->ccb_info[i].ccb_tag = 0xffffffff;
pm8001_ha->ccb_info[i].ccb_tag = PM8001_INVALID_TAG;
pm8001_ha->ccb_info[i].device = NULL;
++pm8001_ha->tags_num;
}
return 0;
err_out_noccb:
......
drivers/scsi/pm8001/pm8001_sas.c
View file @ 7fb23a78
......@@ -553,7 +553,7 @@ void pm8001_ccb_task_free(struct pm8001_hba_info *pm8001_ha,
task->lldd_task = NULL;
ccb->task = NULL;
ccb->ccb_tag = 0xFFFFFFFF;
ccb->ccb_tag = PM8001_INVALID_TAG;
ccb->open_retry = 0;
pm8001_tag_free(pm8001_ha, ccb_idx);
}
......@@ -831,9 +831,11 @@ void pm8001_open_reject_retry(
struct task_status_struct *ts;
struct pm8001_device *pm8001_dev;
unsigned long flags1;
u32 tag;
struct pm8001_ccb_info *ccb = &pm8001_ha->ccb_info[i];
if (ccb->ccb_tag == PM8001_INVALID_TAG)
continue;
pm8001_dev = ccb->device;
if (!pm8001_dev || (pm8001_dev->dev_type == SAS_PHY_UNUSED))
continue;
......@@ -845,9 +847,6 @@ void pm8001_open_reject_retry(
continue;
} else if (pm8001_dev != device_to_close)
continue;
tag = ccb->ccb_tag;
if (!tag || (tag == 0xFFFFFFFF))
continue;
task = ccb->task;
if (!task || !task->task_done)
continue;
......@@ -867,11 +866,11 @@ void pm8001_open_reject_retry(
& SAS_TASK_STATE_ABORTED))) {
spin_unlock_irqrestore(&task->task_state_lock,
flags1);
pm8001_ccb_task_free(pm8001_ha, task, ccb, tag);
pm8001_ccb_task_free(pm8001_ha, task, ccb, ccb->ccb_tag);
} else {
spin_unlock_irqrestore(&task->task_state_lock,
flags1);
pm8001_ccb_task_free(pm8001_ha, task, ccb, tag);
pm8001_ccb_task_free(pm8001_ha, task, ccb, ccb->ccb_tag);
mb();/* in order to force CPU ordering */
spin_unlock_irqrestore(&pm8001_ha->lock, flags);
task->task_done(task);
......
drivers/scsi/pm8001/pm8001_sas.h
View file @ 7fb23a78
......@@ -732,6 +732,8 @@ void pm8001_free_dev(struct pm8001_device *pm8001_dev);
/* ctl shared API */
extern const struct attribute_group *pm8001_host_groups[];
#define PM8001_INVALID_TAG ((u32)-1)
static inline void
pm8001_ccb_task_free_done(struct pm8001_hba_info *pm8001_ha,
struct sas_task *task, struct pm8001_ccb_info *ccb,
......
drivers/scsi/pm8001/pm80xx_hwi.c
View file @ 7fb23a78
......@@ -2402,11 +2402,6 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha,
param = le32_to_cpu(psataPayload->param);
tag = le32_to_cpu(psataPayload->tag);
if (!tag) {
pm8001_dbg(pm8001_ha, FAIL, "tag null\n");
return;
}
ccb = &pm8001_ha->ccb_info[tag];
t = ccb->task;
pm8001_dev = ccb->device;
......
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