linux-kernel - Re: [PATCH] [SCSI] pm8001: Use spin_lock_irqsave() for task

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Date:	Fri, 9 Mar 2012 07:59:33 -0500
From:	Mark Salyzyn <mark_salyzyn@...atex.com>
To:	santosh nayak <santoshprasadnayak@...il.com>
Cc:	Mark Salyzyn <mark_salyzyn@...atex.com>, jack_wang@...sh.com,
	lindar_liu@...sh.com, JBottomley@...allels.com,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] [SCSI] pm8001: Use spin_lock_irqsave() for task_state.

ACK

On Mar 9, 2012, at 3:13 AM, santosh nayak wrote:

> From: Santosh Nayak <santoshprasadnayak@...il.com>
> 
> Use spin_lock_irqsave() for task_state.
> 
> Signed-off-by: Santosh Nayak <santoshprasadnayak@...il.com>
> ---
> drivers/scsi/pm8001/pm8001_hwi.c |   18 ++++++++++--------
> 1 files changed, 10 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/scsi/pm8001/pm8001_hwi.c b/drivers/scsi/pm8001/pm8001_hwi.c
> index 3619f6e..9d82ee5 100644
> --- a/drivers/scsi/pm8001/pm8001_hwi.c
> +++ b/drivers/scsi/pm8001/pm8001_hwi.c
> @@ -2093,6 +2093,7 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
> 	struct ata_task_resp *resp ;
> 	u32 *sata_resp;
> 	struct pm8001_device *pm8001_dev;
> +	unsigned long flags;
> 
> 	psataPayload = (struct sata_completion_resp *)(piomb + 4);
> 	status = le32_to_cpu(psataPayload->status);
> @@ -2382,26 +2383,26 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
> 		ts->stat = SAS_DEV_NO_RESPONSE;
> 		break;
> 	}
> -	spin_lock_irq(&t->task_state_lock);
> +	spin_lock_irqsave(&t->task_state_lock, flags);
> 	t->task_state_flags &= ~SAS_TASK_STATE_PENDING;
> 	t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
> 	t->task_state_flags |= SAS_TASK_STATE_DONE;
> 	if (unlikely((t->task_state_flags & SAS_TASK_STATE_ABORTED))) {
> -		spin_unlock_irq(&t->task_state_lock);
> +		spin_unlock_irqrestore(&t->task_state_lock, flags);
> 		PM8001_FAIL_DBG(pm8001_ha,
> 			pm8001_printk("task 0x%p done with io_status 0x%x"
> 			" 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_irq(&t->task_state_lock);
> +		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) {
> -		spin_unlock_irq(&t->task_state_lock);
> +		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);
> @@ -2423,6 +2424,7 @@ static void mpi_sata_event(struct pm8001_hba_info *pm8001_ha , void *piomb)
> 	u32 tag = le32_to_cpu(psataPayload->tag);
> 	u32 port_id = le32_to_cpu(psataPayload->port_id);
> 	u32 dev_id = le32_to_cpu(psataPayload->device_id);
> +	unsigned long flags;
> 
> 	ccb = &pm8001_ha->ccb_info[tag];
> 	t = ccb->task;
> @@ -2593,26 +2595,26 @@ static void mpi_sata_event(struct pm8001_hba_info *pm8001_ha , void *piomb)
> 		ts->stat = SAS_OPEN_TO;
> 		break;
> 	}
> -	spin_lock_irq(&t->task_state_lock);
> +	spin_lock_irqsave(&t->task_state_lock, flags);
> 	t->task_state_flags &= ~SAS_TASK_STATE_PENDING;
> 	t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
> 	t->task_state_flags |= SAS_TASK_STATE_DONE;
> 	if (unlikely((t->task_state_flags & SAS_TASK_STATE_ABORTED))) {
> -		spin_unlock_irq(&t->task_state_lock);
> +		spin_unlock_irqrestore(&t->task_state_lock, flags);
> 		PM8001_FAIL_DBG(pm8001_ha,
> 			pm8001_printk("task 0x%p done with io_status 0x%x"
> 			" 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_irq(&t->task_state_lock);
> +		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) {
> -		spin_unlock_irq(&t->task_state_lock);
> +		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);

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