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scsi_lib: correctly retry failed zero length REQ_TYPE_FS commands 

When SCSI was written, all commands coming from the filesystem
(REQ_TYPE_FS commands) had data.  This meant that our signal for needing
to complete the command was the number of bytes completed being equal to
the number of bytes in the request.  Unfortunately, with the advent of
flush barriers, we can now get zero length REQ_TYPE_FS commands, which
confuse this logic because they satisfy the condition every time.  This
means they never get retried even for retryable conditions, like UNIT
ATTENTION because we complete them early assuming they're done.  Fix
this by special casing the early completion condition to recognise zero
length commands with errors and let them drop through to the retry code.

Cc: stable@vger.kernel.org
Reported-by: Sebastian Parschauer <s.parschauer@gmx.de>
Signed-off-by: James E.J. Bottomley <jejb@linux.vnet.ibm.com>
Tested-by: Jack Wang <jinpu.wang@profitbricks.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
James Bottomley 2016-05-13 12:04:06 -07:00 committed by Martin K. Petersen
parent 97f00905ec
commit a621bac304
1 changed files with 5 additions and 2 deletions
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7
drivers/scsi/scsi_lib.c
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@ -821,9 +821,12 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
}
/*
* If we finished all bytes in the request we are done now.
* special case: failed zero length commands always need to
* drop down into the retry code. Otherwise, if we finished
* all bytes in the request we are done now.
*/
if (!scsi_end_request(req, error, good_bytes, 0))
if (!(blk_rq_bytes(req) == 0 && error) &&
!scsi_end_request(req, error, good_bytes, 0))
return;
/*