From: Suresh Thiagarajan Date: Thu, 16 Jan 2014 09:56:21 +0000 (+0530) Subject: [SCSI] pm80xx: Spinlock fix X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=2b01d816f5f884d5ea16ab2498736b1221bc027c;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git [SCSI] pm80xx: Spinlock fix spin_lock_irqsave for the HBA lock is called in one function where flag is local to that function. Another function is called from the first function where lock has to be released using spin_unlock_irqrestore for calling task_done of libsas. In the second function also flag is declared and used. For calling task_done there is no need to enable the irq. So instead of using spin_lock_irqsave and spin_unlock_irqrestore, spin_lock and spin_unlock is used now. This also avoids passing the flags across all the functions where HBA lock is being used. Also removed redundant code. Reported-by: Jason Seba Signed-off-by: Oleg Nesterov Signed-off-by: Suresh Thiagarajan Signed-off-by: Viswas G Acked-by: Jack Wang Signed-off-by: James Bottomley --- diff --git a/drivers/scsi/pm8001/pm8001_hwi.c b/drivers/scsi/pm8001/pm8001_hwi.c index 561ca2c348d6..a97be015e52e 100644 --- a/drivers/scsi/pm8001/pm8001_hwi.c +++ b/drivers/scsi/pm8001/pm8001_hwi.c @@ -2502,11 +2502,7 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb) IO_OPEN_CNX_ERROR_IT_NEXUS_LOSS); ts->resp = SAS_TASK_UNDELIVERED; ts->stat = SAS_QUEUE_FULL; - pm8001_ccb_task_free(pm8001_ha, t, ccb, tag); - mb();/*in order to force CPU ordering*/ - spin_unlock_irq(&pm8001_ha->lock); - t->task_done(t); - spin_lock_irq(&pm8001_ha->lock); + pm8001_ccb_task_free_done(pm8001_ha, t, ccb, tag); return; } break; @@ -2522,11 +2518,7 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb) IO_OPEN_CNX_ERROR_IT_NEXUS_LOSS); ts->resp = SAS_TASK_UNDELIVERED; ts->stat = SAS_QUEUE_FULL; - pm8001_ccb_task_free(pm8001_ha, t, ccb, tag); - mb();/*ditto*/ - spin_unlock_irq(&pm8001_ha->lock); - t->task_done(t); - spin_lock_irq(&pm8001_ha->lock); + pm8001_ccb_task_free_done(pm8001_ha, t, ccb, tag); return; } break; @@ -2550,11 +2542,7 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb) IO_OPEN_CNX_ERROR_STP_RESOURCES_BUSY); ts->resp = SAS_TASK_UNDELIVERED; ts->stat = SAS_QUEUE_FULL; - pm8001_ccb_task_free(pm8001_ha, t, ccb, tag); - mb();/* ditto*/ - spin_unlock_irq(&pm8001_ha->lock); - t->task_done(t); - spin_lock_irq(&pm8001_ha->lock); + pm8001_ccb_task_free_done(pm8001_ha, t, ccb, tag); return; } break; @@ -2617,11 +2605,7 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb) IO_DS_NON_OPERATIONAL); ts->resp = SAS_TASK_UNDELIVERED; ts->stat = SAS_QUEUE_FULL; - pm8001_ccb_task_free(pm8001_ha, t, ccb, tag); - mb();/*ditto*/ - spin_unlock_irq(&pm8001_ha->lock); - t->task_done(t); - spin_lock_irq(&pm8001_ha->lock); + pm8001_ccb_task_free_done(pm8001_ha, t, ccb, tag); return; } break; @@ -2641,11 +2625,7 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb) IO_DS_IN_ERROR); ts->resp = SAS_TASK_UNDELIVERED; ts->stat = SAS_QUEUE_FULL; - pm8001_ccb_task_free(pm8001_ha, t, ccb, tag); - mb();/*ditto*/ - spin_unlock_irq(&pm8001_ha->lock); - t->task_done(t); - spin_lock_irq(&pm8001_ha->lock); + pm8001_ccb_task_free_done(pm8001_ha, t, ccb, tag); return; } break; @@ -2674,20 +2654,9 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb) " resp 0x%x stat 0x%x but aborted by upper layer!\n", t, status, ts->resp, ts->stat)); pm8001_ccb_task_free(pm8001_ha, t, ccb, tag); - } else if (t->uldd_task) { - spin_unlock_irqrestore(&t->task_state_lock, flags); - pm8001_ccb_task_free(pm8001_ha, t, ccb, tag); - mb();/* ditto */ - spin_unlock_irq(&pm8001_ha->lock); - t->task_done(t); - spin_lock_irq(&pm8001_ha->lock); - } else if (!t->uldd_task) { + } else { spin_unlock_irqrestore(&t->task_state_lock, flags); - pm8001_ccb_task_free(pm8001_ha, t, ccb, tag); - mb();/*ditto*/ - spin_unlock_irq(&pm8001_ha->lock); - t->task_done(t); - spin_lock_irq(&pm8001_ha->lock); + pm8001_ccb_task_free_done(pm8001_ha, t, ccb, tag); } } @@ -2796,11 +2765,7 @@ static void mpi_sata_event(struct pm8001_hba_info *pm8001_ha , void *piomb) IO_OPEN_CNX_ERROR_IT_NEXUS_LOSS); ts->resp = SAS_TASK_COMPLETE; ts->stat = SAS_QUEUE_FULL; - pm8001_ccb_task_free(pm8001_ha, t, ccb, tag); - mb();/*ditto*/ - spin_unlock_irq(&pm8001_ha->lock); - t->task_done(t); - spin_lock_irq(&pm8001_ha->lock); + pm8001_ccb_task_free_done(pm8001_ha, t, ccb, tag); return; } break; @@ -2909,20 +2874,9 @@ static void mpi_sata_event(struct pm8001_hba_info *pm8001_ha , void *piomb) " resp 0x%x stat 0x%x but aborted by upper layer!\n", t, event, ts->resp, ts->stat)); pm8001_ccb_task_free(pm8001_ha, t, ccb, tag); - } else if (t->uldd_task) { - spin_unlock_irqrestore(&t->task_state_lock, flags); - pm8001_ccb_task_free(pm8001_ha, t, ccb, tag); - mb();/* ditto */ - spin_unlock_irq(&pm8001_ha->lock); - t->task_done(t); - spin_lock_irq(&pm8001_ha->lock); - } else if (!t->uldd_task) { + } else { spin_unlock_irqrestore(&t->task_state_lock, flags); - pm8001_ccb_task_free(pm8001_ha, t, ccb, tag); - mb();/*ditto*/ - spin_unlock_irq(&pm8001_ha->lock); - t->task_done(t); - spin_lock_irq(&pm8001_ha->lock); + pm8001_ccb_task_free_done(pm8001_ha, t, ccb, tag); } } @@ -4467,23 +4421,11 @@ static int pm8001_chip_sata_req(struct pm8001_hba_info *pm8001_ha, " stat 0x%x but aborted by upper layer " "\n", task, ts->resp, ts->stat)); pm8001_ccb_task_free(pm8001_ha, task, ccb, tag); - } else if (task->uldd_task) { - spin_unlock_irqrestore(&task->task_state_lock, - flags); - pm8001_ccb_task_free(pm8001_ha, task, ccb, tag); - mb();/* ditto */ - spin_unlock_irq(&pm8001_ha->lock); - task->task_done(task); - spin_lock_irq(&pm8001_ha->lock); - return 0; - } else if (!task->uldd_task) { + } else { spin_unlock_irqrestore(&task->task_state_lock, flags); - pm8001_ccb_task_free(pm8001_ha, task, ccb, tag); - mb();/*ditto*/ - spin_unlock_irq(&pm8001_ha->lock); - task->task_done(task); - spin_lock_irq(&pm8001_ha->lock); + pm8001_ccb_task_free_done(pm8001_ha, task, + ccb, tag); return 0; } } diff --git a/drivers/scsi/pm8001/pm8001_sas.h b/drivers/scsi/pm8001/pm8001_sas.h index 6c5fd5ee22d3..1ee06f21803b 100644 --- a/drivers/scsi/pm8001/pm8001_sas.h +++ b/drivers/scsi/pm8001/pm8001_sas.h @@ -708,5 +708,17 @@ ssize_t pm8001_get_gsm_dump(struct device *cdev, u32, char *buf); /* ctl shared API */ extern struct device_attribute *pm8001_host_attrs[]; +static inline void +pm8001_ccb_task_free_done(struct pm8001_hba_info *pm8001_ha, + struct sas_task *task, struct pm8001_ccb_info *ccb, + u32 ccb_idx) +{ + pm8001_ccb_task_free(pm8001_ha, task, ccb, ccb_idx); + smp_mb(); /*in order to force CPU ordering*/ + spin_unlock(&pm8001_ha->lock); + task->task_done(task); + spin_lock(&pm8001_ha->lock); +} + #endif diff --git a/drivers/scsi/pm8001/pm80xx_hwi.c b/drivers/scsi/pm8001/pm80xx_hwi.c index 9b5414249cc4..d70587f96184 100644 --- a/drivers/scsi/pm8001/pm80xx_hwi.c +++ b/drivers/scsi/pm8001/pm80xx_hwi.c @@ -2168,11 +2168,7 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb) IO_OPEN_CNX_ERROR_IT_NEXUS_LOSS); ts->resp = SAS_TASK_UNDELIVERED; ts->stat = SAS_QUEUE_FULL; - pm8001_ccb_task_free(pm8001_ha, t, ccb, tag); - mb();/*in order to force CPU ordering*/ - spin_unlock_irq(&pm8001_ha->lock); - t->task_done(t); - spin_lock_irq(&pm8001_ha->lock); + pm8001_ccb_task_free_done(pm8001_ha, t, ccb, tag); return; } break; @@ -2188,11 +2184,7 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb) IO_OPEN_CNX_ERROR_IT_NEXUS_LOSS); ts->resp = SAS_TASK_UNDELIVERED; ts->stat = SAS_QUEUE_FULL; - pm8001_ccb_task_free(pm8001_ha, t, ccb, tag); - mb();/*ditto*/ - spin_unlock_irq(&pm8001_ha->lock); - t->task_done(t); - spin_lock_irq(&pm8001_ha->lock); + pm8001_ccb_task_free_done(pm8001_ha, t, ccb, tag); return; } break; @@ -2214,11 +2206,7 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb) IO_OPEN_CNX_ERROR_STP_RESOURCES_BUSY); ts->resp = SAS_TASK_UNDELIVERED; ts->stat = SAS_QUEUE_FULL; - pm8001_ccb_task_free(pm8001_ha, t, ccb, tag); - mb();/* ditto*/ - spin_unlock_irq(&pm8001_ha->lock); - t->task_done(t); - spin_lock_irq(&pm8001_ha->lock); + pm8001_ccb_task_free_done(pm8001_ha, t, ccb, tag); return; } break; @@ -2281,11 +2269,7 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb) IO_DS_NON_OPERATIONAL); ts->resp = SAS_TASK_UNDELIVERED; ts->stat = SAS_QUEUE_FULL; - pm8001_ccb_task_free(pm8001_ha, t, ccb, tag); - mb();/*ditto*/ - spin_unlock_irq(&pm8001_ha->lock); - t->task_done(t); - spin_lock_irq(&pm8001_ha->lock); + pm8001_ccb_task_free_done(pm8001_ha, t, ccb, tag); return; } break; @@ -2305,11 +2289,7 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb) IO_DS_IN_ERROR); ts->resp = SAS_TASK_UNDELIVERED; ts->stat = SAS_QUEUE_FULL; - pm8001_ccb_task_free(pm8001_ha, t, ccb, tag); - mb();/*ditto*/ - spin_unlock_irq(&pm8001_ha->lock); - t->task_done(t); - spin_lock_irq(&pm8001_ha->lock); + pm8001_ccb_task_free_done(pm8001_ha, t, ccb, tag); return; } break; @@ -2338,20 +2318,9 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb) " resp 0x%x stat 0x%x but aborted by upper layer!\n", t, status, ts->resp, ts->stat)); pm8001_ccb_task_free(pm8001_ha, t, ccb, tag); - } else if (t->uldd_task) { - spin_unlock_irqrestore(&t->task_state_lock, flags); - pm8001_ccb_task_free(pm8001_ha, t, ccb, tag); - mb();/* ditto */ - spin_unlock_irq(&pm8001_ha->lock); - t->task_done(t); - spin_lock_irq(&pm8001_ha->lock); - } else if (!t->uldd_task) { + } else { spin_unlock_irqrestore(&t->task_state_lock, flags); - pm8001_ccb_task_free(pm8001_ha, t, ccb, tag); - mb();/*ditto*/ - spin_unlock_irq(&pm8001_ha->lock); - t->task_done(t); - spin_lock_irq(&pm8001_ha->lock); + pm8001_ccb_task_free_done(pm8001_ha, t, ccb, tag); } } @@ -2463,11 +2432,7 @@ static void mpi_sata_event(struct pm8001_hba_info *pm8001_ha , void *piomb) IO_OPEN_CNX_ERROR_IT_NEXUS_LOSS); ts->resp = SAS_TASK_COMPLETE; ts->stat = SAS_QUEUE_FULL; - pm8001_ccb_task_free(pm8001_ha, t, ccb, tag); - mb();/*ditto*/ - spin_unlock_irq(&pm8001_ha->lock); - t->task_done(t); - spin_lock_irq(&pm8001_ha->lock); + pm8001_ccb_task_free_done(pm8001_ha, t, ccb, tag); return; } break; @@ -2589,20 +2554,9 @@ static void mpi_sata_event(struct pm8001_hba_info *pm8001_ha , void *piomb) " resp 0x%x stat 0x%x but aborted by upper layer!\n", t, event, ts->resp, ts->stat)); pm8001_ccb_task_free(pm8001_ha, t, ccb, tag); - } else if (t->uldd_task) { - spin_unlock_irqrestore(&t->task_state_lock, flags); - pm8001_ccb_task_free(pm8001_ha, t, ccb, tag); - mb();/* ditto */ - spin_unlock_irq(&pm8001_ha->lock); - t->task_done(t); - spin_lock_irq(&pm8001_ha->lock); - } else if (!t->uldd_task) { + } else { spin_unlock_irqrestore(&t->task_state_lock, flags); - pm8001_ccb_task_free(pm8001_ha, t, ccb, tag); - mb();/*ditto*/ - spin_unlock_irq(&pm8001_ha->lock); - t->task_done(t); - spin_lock_irq(&pm8001_ha->lock); + pm8001_ccb_task_free_done(pm8001_ha, t, ccb, tag); } } @@ -4297,23 +4251,11 @@ static int pm80xx_chip_sata_req(struct pm8001_hba_info *pm8001_ha, "\n", task, ts->resp, ts->stat)); pm8001_ccb_task_free(pm8001_ha, task, ccb, tag); return 0; - } else if (task->uldd_task) { - spin_unlock_irqrestore(&task->task_state_lock, - flags); - pm8001_ccb_task_free(pm8001_ha, task, ccb, tag); - mb();/* ditto */ - spin_unlock_irq(&pm8001_ha->lock); - task->task_done(task); - spin_lock_irq(&pm8001_ha->lock); - return 0; - } else if (!task->uldd_task) { + } else { spin_unlock_irqrestore(&task->task_state_lock, flags); - pm8001_ccb_task_free(pm8001_ha, task, ccb, tag); - mb();/*ditto*/ - spin_unlock_irq(&pm8001_ha->lock); - task->task_done(task); - spin_lock_irq(&pm8001_ha->lock); + pm8001_ccb_task_free_done(pm8001_ha, task, + ccb, tag); return 0; } }