From: Damien Le Moal damien.lemoal@opensource.wdc.com
[ Upstream commit 7fb23a785ba38dea907323a039123f231195b297 ]
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.... 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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/scsi/pm8001/pm8001_hwi.c | 52 +++++++++++-------------------- drivers/scsi/pm8001/pm8001_init.c | 3 +- drivers/scsi/pm8001/pm8001_sas.c | 13 ++++---- drivers/scsi/pm8001/pm8001_sas.h | 2 ++ drivers/scsi/pm8001/pm80xx_hwi.c | 5 --- 5 files changed, 28 insertions(+), 47 deletions(-)
diff --git a/drivers/scsi/pm8001/pm8001_hwi.c b/drivers/scsi/pm8001/pm8001_hwi.c index da9cac6671a3..e12b3ea4153a 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) { @@ -1567,11 +1566,11 @@ 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); @@ -1580,7 +1579,6 @@ 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; @@ -1614,8 +1612,8 @@ 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) { @@ -1686,19 +1684,13 @@ 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) { @@ -1707,10 +1699,11 @@ 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) { @@ -1718,7 +1711,7 @@ 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 */ @@ -2314,11 +2307,6 @@ 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; @@ -3053,7 +3041,7 @@ 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); }
@@ -3071,7 +3059,7 @@ 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); }
@@ -3098,7 +3086,7 @@ 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; } @@ -3144,7 +3132,7 @@ 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); }
@@ -3557,7 +3545,7 @@ 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; } @@ -3629,7 +3617,7 @@ 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; @@ -3665,10 +3653,6 @@ 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]; diff --git a/drivers/scsi/pm8001/pm8001_init.c b/drivers/scsi/pm8001/pm8001_init.c index d8a2121cb8d9..d2a2593f669d 100644 --- a/drivers/scsi/pm8001/pm8001_init.c +++ b/drivers/scsi/pm8001/pm8001_init.c @@ -1216,10 +1216,11 @@ 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: diff --git a/drivers/scsi/pm8001/pm8001_sas.c b/drivers/scsi/pm8001/pm8001_sas.c index 32edda3e55c6..c1f871561b32 100644 --- a/drivers/scsi/pm8001/pm8001_sas.c +++ b/drivers/scsi/pm8001/pm8001_sas.c @@ -567,7 +567,7 @@ 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); } @@ -952,9 +952,11 @@ 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; @@ -966,9 +968,6 @@ 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; @@ -989,11 +988,11 @@ 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); diff --git a/drivers/scsi/pm8001/pm8001_sas.h b/drivers/scsi/pm8001/pm8001_sas.h index a17da1cebce1..1791cdf30276 100644 --- a/drivers/scsi/pm8001/pm8001_sas.h +++ b/drivers/scsi/pm8001/pm8001_sas.h @@ -738,6 +738,8 @@ 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, diff --git a/drivers/scsi/pm8001/pm80xx_hwi.c b/drivers/scsi/pm8001/pm80xx_hwi.c index f6b9253e626b..00c95ea480ad 100644 --- a/drivers/scsi/pm8001/pm80xx_hwi.c +++ b/drivers/scsi/pm8001/pm80xx_hwi.c @@ -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;