diff options
| author | Oliver Neukum <oneukum@suse.com> | 2016-09-12 16:19:41 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-09-13 09:08:24 +0300 |
| commit | 050bc4e846af24e77af82d0fa5f718e0919d15a4 (patch) | |
| tree | 9a670fd070e7d58478639602cb133509826329d2 /drivers/usb/storage/usb.c | |
| parent | 6406c3d226374c28d452b11db3b5ac241ce26191 (diff) | |
| download | linux-050bc4e846af24e77af82d0fa5f718e0919d15a4.tar.xz | |
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/usb.c')
| -rw-r--r-- | drivers/usb/storage/usb.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c index c8afd2d4c40b..2cba13a532cd 100644 --- a/drivers/usb/storage/usb.c +++ b/drivers/usb/storage/usb.c @@ -498,7 +498,8 @@ void usb_stor_adjust_quirks(struct usb_device *udev, unsigned long *fflags) US_FL_NO_READ_DISC_INFO | US_FL_NO_READ_CAPACITY_16 | US_FL_INITIAL_READ10 | US_FL_WRITE_CACHE | US_FL_NO_ATA_1X | US_FL_NO_REPORT_OPCODES | - US_FL_MAX_SECTORS_240 | US_FL_NO_REPORT_LUNS); + US_FL_MAX_SECTORS_240 | US_FL_NO_REPORT_LUNS | + US_FL_ALWAYS_SYNC); p = quirks; while (*p) { @@ -581,6 +582,9 @@ void usb_stor_adjust_quirks(struct usb_device *udev, unsigned long *fflags) case 'w': f |= US_FL_NO_WP_DETECT; break; + case 'y': + f |= US_FL_ALWAYS_SYNC; + break; /* Ignore unrecognized flag characters */ } } |