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| author | Alan Stern <stern@rowland.harvard.edu> | 2014-01-15 15:37:04 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-04-26 17:19:04 -0700 |
| commit | 0561b77b0f366aa168fa23aa07b606f5f49638c8 (patch) | |
| tree | f56de174f2c580561df9df793fa7ec7722b95acc /drivers/scsi/sd.c | |
| parent | 4f1f4df2c1aee858da70f91970f6c9cb651a63de (diff) | |
| download | lwn-0561b77b0f366aa168fa23aa07b606f5f49638c8.tar.gz lwn-0561b77b0f366aa168fa23aa07b606f5f49638c8.zip | |
SCSI: sd: don't fail if the device doesn't recognize SYNCHRONIZE CACHE
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@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>
Diffstat (limited to 'drivers/scsi/sd.c')
| -rw-r--r-- | drivers/scsi/sd.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 470954aba728..36d1a23f14be 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -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; |