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Petersen" , John Garry , Xiang Chen , Jason Yan , Luo Jiaxing Subject: [PATCH v3 20/31] scsi: pm8001: Fix tag values handling Date: Mon, 14 Feb 2022 11:17:36 +0900 Message-Id: <20220214021747.4976-21-damien.lemoal@opensource.wdc.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220214021747.4976-1-damien.lemoal@opensource.wdc.com> References: <20220214021747.4976-1-damien.lemoal@opensource.wdc.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org 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. Signed-off-by: Damien Le Moal --- 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 64a87c5bd66b..640e8473ce06 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; @@ -3068,7 +3056,7 @@ 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); } @@ -3086,7 +3074,7 @@ 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); } @@ -3113,7 +3101,7 @@ 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; } @@ -3159,7 +3147,7 @@ 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); } @@ -3572,7 +3560,7 @@ 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; } @@ -3644,7 +3632,7 @@ 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; @@ -3680,10 +3668,6 @@ 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 4b9a26f008a9..8f44be8364dc 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 6062664e8698..d9b8d61b7578 100644 --- a/drivers/scsi/pm8001/pm8001_sas.c +++ b/drivers/scsi/pm8001/pm8001_sas.c @@ -563,7 +563,7 @@ 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); } @@ -943,9 +943,11 @@ 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; @@ -957,9 +959,6 @@ 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; @@ -979,11 +978,11 @@ 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 73e9379ab09a..9cea0a27f1a1 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;