tree be812ae236e94d84fab9435c0ca41e947e6faa3a
parent 406c057c4e00744453d5b0731eb23629ec14dcdf
author Martin K. Petersen <martin.petersen@oracle.com> 1430790861 -0400
committer Tejun Heo <tj@kernel.org> 1430832619 -0400

libata: Fall back to unqueued READ LOG EXT if the DMA variant fails

Some devices advertise support for the READ/WRITE LOG DMA EXT commands
but fail when we try to issue them. This can lead to queued TRIM being
unintentionally disabled since the relevant feature flag is located in a
general purpose log page.

Fall back to unqueued READ LOG EXT if the DMA variant fails while
reading a log page.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Tejun Heo <tj@kernel.org>