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scsi: replace sr_test_unit_ready() with scsi_test_unit_ready()

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The usage of TUR has been confusing involving several different
commits updating different parts over time.  Currently, the only
differences between scsi_test_unit_ready() and sr_test_unit_ready()
are,

* scsi_test_unit_ready() also sets sdev->changed on NOT_READY.

* scsi_test_unit_ready() returns 0 if TUR ended with UNIT_ATTENTION or
  NOT_READY.

Due to the above two differences, sr is using its own
sr_test_unit_ready(), but sd - the sole user of the above extra
handling - doesn't even need them.

Where scsi_test_unit_ready() is used in sd_media_changed(), the code
is looking for device ready w/ media present state which is true iff
TUR succeeds w/o sense data or UA, and when the device is not ready
for whatever reason sd_media_changed() explicitly marks media as
missing so there's no reason to set sdev->changed automatically from
scsi_test_unit_ready() on NOT_READY.

Drop both special handlings from scsi_test_unit_ready(), which makes
it equivalant to sr_test_unit_ready(), and replace
sr_test_unit_ready() with scsi_test_unit_ready().  Also, drop the
unnecessary explicit NOT_READY check from sd_media_changed().
Checking return value is enough for testing device readiness.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Tejun Heo
2010-12-08 20:57:40 +01:00
committed by Jens Axboe
parent 638428ece6
commit 9f8a2c23c6
5 changed files with 6 additions and 51 deletions
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13
drivers/scsi/scsi_lib.c
View File

@@ -1984,8 +1984,7 @@ EXPORT_SYMBOL(scsi_mode_sense);
* in.
*
* Returns zero if unsuccessful or an error if TUR failed. For
* removable media, a return of NOT_READY or UNIT_ATTENTION is
* translated to success, with the ->changed flag updated.
* removable media, UNIT_ATTENTION sets ->changed flag.
**/
int
scsi_test_unit_ready(struct scsi_device *sdev, int timeout, int retries,
@@ -2012,16 +2011,6 @@ scsi_test_unit_ready(struct scsi_device *sdev, int timeout, int retries,
} while (scsi_sense_valid(sshdr) &&
sshdr->sense_key == UNIT_ATTENTION && --retries);
if (!sshdr)
/* could not allocate sense buffer, so can't process it */
return result;
if (sdev->removable && scsi_sense_valid(sshdr) &&
(sshdr->sense_key == UNIT_ATTENTION ||
sshdr->sense_key == NOT_READY)) {
sdev->changed = 1;
result = 0;
}
if (!sshdr_external)
kfree(sshdr);
return result;