4.9-stable review patch. If anyone has any objections, please let me know.
------------------ From: Alexander Kappner <[email protected]> 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 <[email protected]> Acked-by: Alan Stern <[email protected]> Cc: stable <[email protected]> Acked-by: Oliver Neukum <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- 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; }
