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[SCSI] sd: Fix handling of NO_SENSE check condition 

The current handling of NO_SENSE check condition is the same as
RECOVERED_ERROR, and assumes that in both cases, the I/O was fully
transferred.

We have seen cases of arrays returning with NO_SENSE (no error), but
the I/O was not completely transferred, thus residual set.  Thus,
rather than return good_bytes as the entire transfer, set good_bytes
to 0, so that the midlayer then applies the residual in calculating
the transfer, and for sd, will fail the I/O and fall into a retry
path.

Signed-off-by: Jamie Wellnitz <Jamie.Wellnitz@emulex.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Jamie Wellnitz 2008-09-11 21:39:36 -04:00 committed by James Bottomley
parent 6c5121b78b
commit 10dab22664
1 changed files with 9 additions and 1 deletions
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10
drivers/scsi/sd.c
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@ -1054,7 +1054,6 @@ static int sd_done(struct scsi_cmnd *SCpnt)
good_bytes = sd_completed_bytes(SCpnt);
break;
case RECOVERED_ERROR:
case NO_SENSE:
/* Inform the user, but make sure that it's not treated
* as a hard error.
*/
@ -1063,6 +1062,15 @@ static int sd_done(struct scsi_cmnd *SCpnt)
memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
good_bytes = scsi_bufflen(SCpnt);
break;
case NO_SENSE:
/* This indicates a false check condition, so ignore it. An
* unknown amount of data was transferred so treat it as an
* error.
*/
scsi_print_sense("sd", SCpnt);
SCpnt->result = 0;
memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
break;
case ABORTED_COMMAND:
if (sshdr.asc == 0x10) { /* DIF: Disk detected corruption */
scsi_print_result(SCpnt);