[#upstream-fixes] libata: retry FS IOs even if it has failed with AC_ERR_INVALID

Submitted by Tejun Heo on Jan. 14, 2010, 7:18 a.m.

Details

Message ID 4B4EC531.2010001@kernel.org
State Not Applicable
Delegated to: David Miller
Headers show

Commit Message

Tejun Heo Jan. 14, 2010, 7:18 a.m.
libata currently doesn't retry if a command fails with AC_ERR_INVALID
assuming that retrying won't get it any further even if retried.
However, a failure may be classified as invalid through hardware
glitch (incorrect reading of the error register or firmware bug) and
there isn't whole lot to gain by not retrying as actually invalid
commands will be failed immediately.  Also, commands serving FS IOs
are extremely unlikely to be invalid.  Retry FS IOs even if it's
marked invalid.

Transient and incorrect invalid failure was seen while debugging
firmware related issue on Samsung n130 on bko#14314.

  http://bugzilla.kernel.org/show_bug.cgi?id=14314

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Johannes Stezenbach <js@sig21.net>
---
 drivers/ata/libata-eh.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

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Comments

Jeff Garzik Jan. 20, 2010, 7:25 p.m.
On 01/14/2010 02:18 AM, Tejun Heo wrote:
> libata currently doesn't retry if a command fails with AC_ERR_INVALID
> assuming that retrying won't get it any further even if retried.
> However, a failure may be classified as invalid through hardware
> glitch (incorrect reading of the error register or firmware bug) and
> there isn't whole lot to gain by not retrying as actually invalid
> commands will be failed immediately.  Also, commands serving FS IOs
> are extremely unlikely to be invalid.  Retry FS IOs even if it's
> marked invalid.
>
> Transient and incorrect invalid failure was seen while debugging
> firmware related issue on Samsung n130 on bko#14314.
>
>    http://bugzilla.kernel.org/show_bug.cgi?id=14314
>
> Signed-off-by: Tejun Heo<tj@kernel.org>
> Reported-by: Johannes Stezenbach<js@sig21.net>

applied


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Patch hide | download patch | download mbox

Index: ata/drivers/ata/libata-eh.c
===================================================================
--- ata.orig/drivers/ata/libata-eh.c
+++ ata/drivers/ata/libata-eh.c
@@ -2028,8 +2028,9 @@  static void ata_eh_link_autopsy(struct a
 			qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_OTHER);
 
 		/* determine whether the command is worth retrying */
-		if (!(qc->err_mask & AC_ERR_INVALID) &&
-		    ((qc->flags & ATA_QCFLAG_IO) || qc->err_mask != AC_ERR_DEV))
+		if (qc->flags & ATA_QCFLAG_IO ||
+		    (!(qc->err_mask & AC_ERR_INVALID) &&
+		     qc->err_mask != AC_ERR_DEV))
 			qc->flags |= ATA_QCFLAG_RETRY;
 
 		/* accumulate error info */