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.com
Reviewed-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
diff --git a/drivers/scsi/pm8001/pm8001_hwi.c b/drivers/scsi/pm8001/pm8001_hwi.c
index be57b9a..6f9ee77 100644
--- a/drivers/scsi/pm8001/pm8001_hwi.c
+++ b/drivers/scsi/pm8001/pm8001_hwi.c
@@ -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];
