diff options
| author | Oliver Neukum | 2016-09-12 15:19:41 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2016-09-13 08:08:24 +0200 |
| commit | 050bc4e846af24e77af82d0fa5f718e0919d15a4 (patch) | |
| tree | 9a670fd070e7d58478639602cb133509826329d2 /drivers/usb/storage/scsiglue.c | |
| parent | 6406c3d226374c28d452b11db3b5ac241ce26191 (diff) | |
scsi: introduce a quirk for false cache reporting
Some SATA to USB bridges fail to cooperate with some
drives resulting in no cache being present being reported
to the host. That causes the host to skip sending
a command to synchronize caches. That causes data loss
when the drive is powered down.
Signed-off-by: Oliver Neukum <oneukum@suse.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/storage/scsiglue.c')
| -rw-r--r-- | drivers/usb/storage/scsiglue.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c index 33eb923df892..8cd2926fb1fe 100644 --- a/drivers/usb/storage/scsiglue.c +++ b/drivers/usb/storage/scsiglue.c @@ -296,6 +296,14 @@ static int slave_configure(struct scsi_device *sdev) if (us->fflags & US_FL_BROKEN_FUA) sdev->broken_fua = 1; + /* Some even totally fail to indicate a cache */ + if (us->fflags & US_FL_ALWAYS_SYNC) { + /* don't read caching information */ + sdev->skip_ms_page_8 = 1; + sdev->skip_ms_page_3f = 1; + /* assume sync is needed */ + sdev->wce_default_on = 1; + } } else { /* |