Commit f13e2201 authored Aug 07, 2009 by Gwendal Grignou Committed by Tejun Heo Oct 07, 2013

libata: make ata_eh_qc_retry() bump scmd->allowed on bogus failures



libata EH decrements scmd->retries when the command failed for reasons
unrelated to the command itself so that, for example, commands aborted
due to suspend / resume cycle don't get penalized; however,
decrementing scmd->retries isn't enough for ATA passthrough commands.

Without this fix, ATA passthrough commands are not resend to the
drive, and no error is signalled to the caller because:

- allowed retry count is 1
- ata_eh_qc_complete fill the sense data, so result is valid
- sense data is filled with untouched ATA registers.

Signed-off-by: Gwendal Grignou <gwendal@google.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: stable@vger.kernel.org

parent 0fed4c09

drivers/ata/libata-eh.c

+3 −3

Original line number	Diff line number	Diff line
		@@ -1322,14 +1322,14 @@ void ata_eh_qc_complete(struct ata_queued_cmd *qc)
		* should be retried. To be used from EH.
		*
		* SCSI midlayer limits the number of retries to scmd->allowed.
		* scmd->retries is decremented for commands which get retried
		* scmd->allowed is incremented for commands which get retried
		* due to unrelated failures (qc->err_mask is zero).
		*/
		void ata_eh_qc_retry(struct ata_queued_cmd *qc)
		{
		struct scsi_cmnd *scmd = qc->scsicmd;
		if (!qc->err_mask && scmd->retries)
		scmd->retries--;
		if (!qc->err_mask)
		scmd->allowed++;
		__ata_eh_qc_complete(qc);
		}