Commit 2b01d816 authored by Suresh Thiagarajan's avatar Suresh Thiagarajan Committed by James Bottomley
Browse files

[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: default avatarJason Seba <jason.seba42@gmail.com>
Signed-off-by: default avatarOleg Nesterov <oleg@redhat.com>
Signed-off-by: default avatarSuresh Thiagarajan <Suresh.Thiagarajan@pmcs.com>
Signed-off-by: default avatarViswas G <viswas.g@pmcs.com>
Acked-by: default avatarJack Wang <xjtuwjp@gmail.com>
Signed-off-by: default avatarJames Bottomley <JBottomley@Parallels.com>
parent eee0f03a

drivers/scsi/pm8001/pm8001_hwi.c

+13 −71
Original line number Diff line number Diff line
@@ -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;

			}

		}

drivers/scsi/pm8001/pm8001_sas.h

+12 −0
Original line number Diff line number Diff line
@@ -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

drivers/scsi/pm8001/pm80xx_hwi.c

+13 −71
Original line number Diff line number Diff line
@@ -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;

			}

		}

CRA Git | Maintained and supported by SUSTech CRA and CCSE