[SCSI] sr: fix corrupt CD data after media change and delay

Reported-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>

If you delay 30s or more before mounting a CD after inserting it then
the kernel has the wrong value for the CD size.

http://marc.info/?t=121276133000001

The problem is in sr_test_unit_ready(): the function eats unit
attentions without adjusting the sdev->changed status.  This means
that when the CD signals changed media via unit attention, we can
ignore it.  Fix by making sr_test_unit_ready() adjust the changed
status.

Tested-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Cc: Stable Tree <stable@kernel.org>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 7ee86d4a761..c82df8bd4d8 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -178,6 +178,9 @@ int sr_test_unit_ready(struct scsi_device *sdev, struct scsi_sense_hdr *sshdr)
                 the_result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL,
                                               0, sshdr, SR_TIMEOUT,
                                               retries--);
+                if (scsi_sense_valid(sshdr) &&
+                    sshdr->sense_key == UNIT_ATTENTION)
+                        sdev->changed = 1;
 
         } while (retries > 0 &&
                  (!scsi_status_is_good(the_result) ||