diff options
Diffstat (limited to 'drivers/ata/libata-eh.c')
| -rw-r--r-- | drivers/ata/libata-eh.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c index ea890911d4f..01831312c36 100644 --- a/drivers/ata/libata-eh.c +++ b/drivers/ata/libata-eh.c @@ -547,7 +547,7 @@ void ata_scsi_error(struct Scsi_Host *host) /* For new EH, all qcs are finished in one of three ways - * normal completion, error completion, and SCSI timeout. - * Both cmpletions can race against SCSI timeout. When normal + * Both completions can race against SCSI timeout. When normal * completion wins, the qc never reaches EH. When error * completion wins, the qc has ATA_QCFLAG_FAILED set. * @@ -562,7 +562,19 @@ void ata_scsi_error(struct Scsi_Host *host) int nr_timedout = 0; spin_lock_irqsave(ap->lock, flags); - + + /* This must occur under the ap->lock as we don't want + a polled recovery to race the real interrupt handler + + The lost_interrupt handler checks for any completed but + non-notified command and completes much like an IRQ handler. + + We then fall into the error recovery code which will treat + this as if normal completion won the race */ + + if (ap->ops->lost_interrupt) + ap->ops->lost_interrupt(ap); + list_for_each_entry_safe(scmd, tmp, &host->eh_cmd_q, eh_entry) { struct ata_queued_cmd *qc; @@ -606,6 +618,9 @@ void ata_scsi_error(struct Scsi_Host *host) ap->eh_tries = ATA_EH_MAX_TRIES; } else spin_unlock_wait(ap->lock); + + /* If we timed raced normal completion and there is nothing to + recover nr_timedout == 0 why exactly are we doing error recovery ? */ repeat: /* invoke error handler */ |