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

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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>
This commit is contained in:
Alexander Kappner 2018-05-18 21:50:15 -07:00 committed by Greg Kroah-Hartman
parent 05826ff135
commit 8c4e97ddfe
1 changed files with 6 additions and 0 deletions
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6
drivers/usb/storage/uas.c
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@ -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;
}