]> err.no Git - linux-2.6/commit
[SCSI] stale residual returned on write following BUSY retry
authorMichael Reed <mdr@sgi.com>
Mon, 17 Sep 2007 22:11:39 +0000 (15:11 -0700)
committerJames Bottomley <jejb@mulgrave.localdomain>
Fri, 12 Oct 2007 18:49:04 +0000 (14:49 -0400)
commit52aeeca9001d1b4037a8e5d0c001ebb5fdc61b37
tree6da81f575055bb26f960d80e9b2c6d1b03567cc8
parentcec744fb2b78e9dcd377a6740f2de05227c7faef
[SCSI] stale residual returned on write following BUSY retry

A BUSY status returned on a write request results in a stale residual
being returned when the write ultimately successfully completes.

This can be reproduced as follows:

1) issue immediate mode rewind to scsi tape drive
2) issue write request

The tape drive returns busy.  The low level driver detects underrun and
sets the residual into the scsi command.  The low level driver responds
with (DID_OK << 16) | scsi_status.  scsi_status is 8, hence
status_byte(result) == 4, i.e., BUSY.

scsi_softirq_done() calls scsi_decide_disposition() which returns
ADD_TO_MLQUEUE.  scsi_softirq_done() then calls scsi_queue_insert()
which, on the way to resubmitting the request to the driver, calls
scsi_init_cmd_errh().

The attached patch modifies scsi_init_cmd_errh() to clear the resid
field.  This prevents a "stale" residual from being returned when the
scsi command finally completes without a BUSY status.

Signed-off-by: Michael Reed <mdr@sgi.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
drivers/scsi/scsi_lib.c