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authorAlan Cox <alan@redhat.com>2009-03-24 11:23:46 +0100
committerJeff Garzik <jgarzik@redhat.com>2009-03-25 03:52:39 +0100
commitc96f1732e25362d10ee7bcac1df8412a2e6b7d23 (patch)
tree66e24eddb174d6751579ec5952f72cbbac0fb038 /drivers/ata/libata-eh.c
parent[libata] Drain data on errors (diff)
downloadlinux-c96f1732e25362d10ee7bcac1df8412a2e6b7d23.tar.xz
linux-c96f1732e25362d10ee7bcac1df8412a2e6b7d23.zip
[libata] Improve timeout handling
On a timeout call a device specific handler early in the recovery so that we can complete and process successful commands which timed out due to IRQ loss or the like rather more elegantly. [Revised to exclude the timeout handling on a few devices that inherit from SFF but are not SFF enough to use the default timeout handler] Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata/libata-eh.c')
-rw-r--r--drivers/ata/libata-eh.c19
1 files changed, 17 insertions, 2 deletions
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index ea890911d4fa..01831312c360 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 */