This is a note to let you know that I've just added the patch titled
SCSI: sd: don't fail if the device doesn't recognize SYNCHRONIZE CACHE
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
scsi-sd-don-t-fail-if-the-device-doesn-t-recognize-synchronize-cache.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7aae51347b21eb738dc1981df1365b57a6c5ee4e Mon Sep 17 00:00:00 2001
From: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Date: Wed, 15 Jan 2014 15:37:04 -0500
Subject: SCSI: sd: don't fail if the device doesn't recognize SYNCHRONIZE CACHE
From: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
commit 7aae51347b21eb738dc1981df1365b57a6c5ee4e upstream.
Evidently some wacky USB-ATA bridges don't recognize the SYNCHRONIZE
CACHE command, as shown in this email thread:
http://marc.info/?t=138978356200002&r=1&w=2
The fact that we can't tell them to drain their caches shouldn't
prevent the system from going into suspend. Therefore sd_sync_cache()
shouldn't return an error if the device replies with an Invalid
Command ASC.
Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Reported-by: Sven Neumann <s.neumann@xxxxxxxxxxxx>
Tested-by: Daniel Mack <zonque@xxxxxxxxx>
Signed-off-by: James Bottomley <JBottomley@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/scsi/sd.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1463,8 +1463,8 @@ static int sd_sync_cache(struct scsi_dis
sd_print_sense_hdr(sdkp, &sshdr);
/* we need to evaluate the error return */
if (scsi_sense_valid(&sshdr) &&
- /* 0x3a is medium not present */
- sshdr.asc == 0x3a)
+ (sshdr.asc == 0x3a || /* medium not present */
+ sshdr.asc == 0x20)) /* invalid command */
/* this is no error here */
return 0;
Patches currently in stable-queue which might be from stern@xxxxxxxxxxxxxxxxxxx are
queue-3.14/scsi-sd-don-t-fail-if-the-device-doesn-t-recognize-synchronize-cache.patch
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