[PATCH 4.14 12/36] usb-storage: Add support for FL_ALWAYS_SYNC flag in the UAS driver

Greg Kroah-Hartman
2018-06-14T14:31:38Z

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;
}