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Commit c839680e authored by Alexander Kappner's avatar Alexander Kappner Committed by Greg Kroah-Hartman
Browse files

usb-storage: Add support for FL_ALWAYS_SYNC flag in the UAS driver 



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: default avatarAlexander Kappner <agk@godking.net>
Acked-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@vger.kernel.org>
Acked-by: default avatarOliver Neukum <oneukum@suse.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent f31eb729

drivers/usb/storage/uas.c

+6 −0
Original line number Diff line number Diff line
@@ -836,6 +836,12 @@ static int uas_slave_configure(struct scsi_device *sdev) 
	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;

}