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| author | TARUISI Hiroaki <taruishi.hiroak@jp.fujitsu.com> | 2011-08-11 20:25:20 +0900 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2011-08-27 08:36:41 -0600 |
| commit | dfcf7775815504d13a1d273073810058caf84b9d (patch) | |
| tree | 148e02241525e2a14df6c7e8b2dc0af455344f44 /drivers/scsi/scsi_error.c | |
| parent | 2ada7fc5d4c4ddeb15bb624045fa3b36ddc025e6 (diff) | |
| download | blackbird-op-linux-dfcf7775815504d13a1d273073810058caf84b9d.tar.gz blackbird-op-linux-dfcf7775815504d13a1d273073810058caf84b9d.zip | |
[SCSI] Fix out of spec CD-ROM problem with media change
Some CD-ROMs fail to report a media change correctly. The specific
one for this patch simply fails to respond to commands, then gives a
UNIT ATTENTION after being reset which returns ASC/ASCQ 28/00. This
is out of spec behaviour, but add a check in the eat CC/UA on reset
path to catch this case so the CD-ROM will function somewhat properly.
[jejb: fixed up white space and accepted without signoff]
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/scsi_error.c')
| -rw-r--r-- | drivers/scsi/scsi_error.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c index a4b9cdbaaa0b..dc6131e6a1ba 100644 --- a/drivers/scsi/scsi_error.c +++ b/drivers/scsi/scsi_error.c @@ -293,8 +293,16 @@ static int scsi_check_sense(struct scsi_cmnd *scmd) * so that we can deal with it there. */ if (scmd->device->expecting_cc_ua) { - scmd->device->expecting_cc_ua = 0; - return NEEDS_RETRY; + /* + * Because some device does not queue unit + * attentions correctly, we carefully check + * additional sense code and qualifier so as + * not to squash media change unit attention. + */ + if (sshdr.asc != 0x28 || sshdr.ascq != 0x00) { + scmd->device->expecting_cc_ua = 0; + return NEEDS_RETRY; + } } /* * if the device is in the process of becoming ready, we |
