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| author | Oliver Neukum <oneukum@suse.com> | 2016-09-12 15:19:41 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-09-13 08:08:24 +0200 |
| commit | 050bc4e846af24e77af82d0fa5f718e0919d15a4 (patch) | |
| tree | 9a670fd070e7d58478639602cb133509826329d2 /include/linux/usb_usual.h | |
| parent | 6406c3d226374c28d452b11db3b5ac241ce26191 (diff) | |
| download | lwn-050bc4e846af24e77af82d0fa5f718e0919d15a4.tar.gz lwn-050bc4e846af24e77af82d0fa5f718e0919d15a4.zip | |
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 'include/linux/usb_usual.h')
| -rw-r--r-- | include/linux/usb_usual.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/usb_usual.h b/include/linux/usb_usual.h index 245f57dbbb61..0aae1b2ee931 100644 --- a/include/linux/usb_usual.h +++ b/include/linux/usb_usual.h @@ -81,6 +81,8 @@ /* Sets max_sectors to 240 */ \ US_FLAG(NO_REPORT_LUNS, 0x10000000) \ /* Cannot handle REPORT_LUNS */ \ + US_FLAG(ALWAYS_SYNC, 0x20000000) \ + /* lies about caching, so always sync */ \ #define US_FLAG(name, value) US_FL_##name = value , enum { US_DO_ALL_FLAGS }; |