[PATCH 3/4] sd: deal with removal of medium to be synched

[Oliver Neukum <oliver@xxxxxxxxxx>]

sd_sync_cache() is called for purposes of power management.
Under those circumstances a medium removal is no error.
The data is lost under any circumstances, so the system may as
well sleep.

Signed-off-by: Oliver Neukum <oneukum@xxxxxxx>
---
 drivers/scsi/sd.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index a344220..c39a97e 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1278,8 +1278,16 @@ static int sd_sync_cache(struct scsi_disk *sdkp)
 
 	if (res) {
 		sd_print_result(sdkp, res);
+
 		if (driver_byte(res) & DRIVER_SENSE)
 			sd_print_sense_hdr(sdkp, &sshdr);
+		/*
+		 * we need to evaluate the error return
+		 * 0x3a is medium not present
+		 * this is no error here
+		 */
+		if ((scsi_sense_valid(&sshdr) && sshdr.asc == 0x3a))
+			return 0;
 	}
 
 	if (res)
-- 
1.7.7

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