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SCSI: sd: don't fail if the device doesn't recognize SYNCHRONIZE CACHE

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commit 7aae51347b 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@rowland.harvard.edu>
Reported-by: Sven Neumann <s.neumann@raumfeld.com>
Tested-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Stern 2014-01-15 15:37:04 -05:00 committed by Greg Kroah-Hartman
parent 4f06f7c753
commit d8e33d97e0
1 changed files with 2 additions and 2 deletions
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4
drivers/scsi/sd.c
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@ -1463,8 +1463,8 @@ static int sd_sync_cache(struct scsi_disk *sdkp)
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;