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libata: fix EH locking

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Wrap ata_qc_complete() calls in EH context in spinlocks, to prevent
races (mainly in ATAPI code paths).
This commit is contained in:
Jeff Garzik
2005-08-25 22:01:20 -04:00
parent 617e44fdfd
commit b8f6153ee4
4 changed files with 28 additions and 3 deletions
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14
drivers/scsi/libata-core.c
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@ -2388,12 +2388,13 @@ static int ata_sg_setup(struct ata_queued_cmd *qc)
void ata_poll_qc_complete(struct ata_queued_cmd *qc, u8 drv_stat)
{
struct ata_port *ap = qc->ap;
unsigned long flags;
spin_lock_irq(&ap->host_set->lock);
spin_lock_irqsave(&ap->host_set->lock, flags);
ap->flags &= ~ATA_FLAG_NOINTR;
ata_irq_on(ap);
ata_qc_complete(qc, drv_stat);
spin_unlock_irq(&ap->host_set->lock);
spin_unlock_irqrestore(&ap->host_set->lock, flags);
}
/**
@ -2973,8 +2974,10 @@ static void atapi_request_sense(struct ata_port *ap, struct ata_device *dev,
static void ata_qc_timeout(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct ata_host_set *host_set = ap->host_set;
struct ata_device *dev = qc->dev;
u8 host_stat = 0, drv_stat;
unsigned long flags;
DPRINTK("ENTER\n");
@ -2985,7 +2988,9 @@ static void ata_qc_timeout(struct ata_queued_cmd *qc)
if (!(cmd->eh_eflags & SCSI_EH_CANCEL_CMD)) {
/* finish completing original command */
spin_lock_irqsave(&host_set->lock, flags);
__ata_qc_complete(qc);
spin_unlock_irqrestore(&host_set->lock, flags);
atapi_request_sense(ap, dev, cmd);
@ -2996,6 +3001,8 @@ static void ata_qc_timeout(struct ata_queued_cmd *qc)
}
}
spin_lock_irqsave(&host_set->lock, flags);
/* hack alert! We cannot use the supplied completion
* function from inside the ->eh_strategy_handler() thread.
* libata is the only user of ->eh_strategy_handler() in
@ -3029,6 +3036,9 @@ static void ata_qc_timeout(struct ata_queued_cmd *qc)
ata_qc_complete(qc, drv_stat);
break;
}
spin_unlock_irqrestore(&host_set->lock, flags);
out:
DPRINTK("EXIT\n");
}