4.9-stable review patch. If anyone has any objections, please let me know.
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From: Alexander Kappner agk@godking.net
commit 8c4e97ddfe73a0958bb0abf7e6a3bc4cc3e04936 upstream.
The ALWAYS_SYNC flag is currently honored by the usb-storage driver but not UAS and is required to work around devices that become unstable upon being queried for cache. This code is taken straight from: drivers/usb/storage/scsiglue.c:284
Signed-off-by: Alexander Kappner agk@godking.net Acked-by: Alan Stern stern@rowland.harvard.edu Cc: stable stable@vger.kernel.org Acked-by: Oliver Neukum oneukum@suse.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/usb/storage/uas.c | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/drivers/usb/storage/uas.c +++ b/drivers/usb/storage/uas.c @@ -836,6 +836,12 @@ static int uas_slave_configure(struct sc if (devinfo->flags & US_FL_BROKEN_FUA) sdev->broken_fua = 1;
+ /* UAS also needs to support FL_ALWAYS_SYNC */ + if (devinfo->flags & US_FL_ALWAYS_SYNC) { + sdev->skip_ms_page_3f = 1; + sdev->skip_ms_page_8 = 1; + sdev->wce_default_on = 1; + } scsi_change_queue_depth(sdev, devinfo->qdepth - 2); return 0; }