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[PATCH] libata: implement ata_eh_wait()

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Implement ata_eh_wait().  On return from this function, it's
guaranteed that the EH which was pending or in progress when the
function was called is complete - including the tailing part of SCSI
EH.  This will be used by hotplug and others to synchronize with EH.

Signed-off-by: Tejun Heo <htejun@gmail.com>
This commit is contained in:
Tejun Heo 2006-05-31 18:27:27 +09:00
parent 7395acb2c8
commit c6cf9e99d1
4 changed files with 42 additions and 0 deletions
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1
drivers/scsi/libata-core.c
View File

@ -5189,6 +5189,7 @@ static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
INIT_WORK(&ap->port_task, NULL, NULL);
INIT_LIST_HEAD(&ap->eh_done_q);
init_waitqueue_head(&ap->eh_wait_q);
/* set cable type */
ap->cbl = ATA_CBL_NONE;

38
drivers/scsi/libata-eh.c
View File

@ -237,6 +237,7 @@ void ata_scsi_error(struct Scsi_Host *host)
ap->eh_context.i = ap->eh_info;
memset(&ap->eh_info, 0, sizeof(ap->eh_info));
ap->flags |= ATA_FLAG_EH_IN_PROGRESS;
ap->flags &= ~ATA_FLAG_EH_PENDING;
spin_unlock_irqrestore(hs_lock, flags);
@ -290,11 +291,48 @@ void ata_scsi_error(struct Scsi_Host *host)
ata_port_printk(ap, KERN_INFO, "EH complete\n");
ap->flags &= ~ATA_FLAG_RECOVERED;
/* tell wait_eh that we're done */
ap->flags &= ~ATA_FLAG_EH_IN_PROGRESS;
wake_up_all(&ap->eh_wait_q);
spin_unlock_irqrestore(hs_lock, flags);
DPRINTK("EXIT\n");
}
/**
* ata_port_wait_eh - Wait for the currently pending EH to complete
* @ap: Port to wait EH for
*
* Wait until the currently pending EH is complete.
*
* LOCKING:
* Kernel thread context (may sleep).
*/
void ata_port_wait_eh(struct ata_port *ap)
{
unsigned long flags;
DEFINE_WAIT(wait);
retry:
spin_lock_irqsave(&ap->host_set->lock, flags);
while (ap->flags & (ATA_FLAG_EH_PENDING | ATA_FLAG_EH_IN_PROGRESS)) {
prepare_to_wait(&ap->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE);
spin_unlock_irqrestore(&ap->host_set->lock, flags);
schedule();
spin_lock_irqsave(&ap->host_set->lock, flags);
}
spin_unlock_irqrestore(&ap->host_set->lock, flags);
/* make sure SCSI EH is complete */
if (scsi_host_in_recovery(ap->host)) {
msleep(10);
goto retry;
}
}
/**
* ata_qc_timeout - Handle timeout of queued command
* @qc: Command that timed out

1
drivers/scsi/libata.h
View File

@ -103,6 +103,7 @@ extern void ata_schedule_scsi_eh(struct Scsi_Host *shost);
/* libata-eh.c */
extern enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd);
extern void ata_scsi_error(struct Scsi_Host *host);
extern void ata_port_wait_eh(struct ata_port *ap);
extern void ata_qc_schedule_eh(struct ata_queued_cmd *qc);
#endif /* __LIBATA_H__ */

2
include/linux/libata.h
View File

@ -157,6 +157,7 @@ enum {
ATA_FLAG_FLUSH_PORT_TASK = (1 << 14), /* flush port task */
ATA_FLAG_EH_PENDING = (1 << 15), /* EH pending */
ATA_FLAG_EH_IN_PROGRESS = (1 << 16), /* EH in progress */
ATA_FLAG_FROZEN = (1 << 17), /* port is frozen */
ATA_FLAG_RECOVERED = (1 << 18), /* recovery action performed */
@ -490,6 +491,7 @@ struct ata_port {
u32 msg_enable;
struct list_head eh_done_q;
wait_queue_head_t eh_wait_q;
void *private_data;