usb-storage: Add quirks to make G-Technology "G-Drive" work

[Oliver Neukum <oneukum@suse.com>]

Am Donnerstag, den 17.05.2018, 01:15 -0700 schrieb Alexander Kappner:
> Yes. Without this flag, the device keeps throwing similar errors on 
> usb-storage. That's the same result I get on a host that doesn't have UAS 
> compiled in. Here's a dmesg:

Hi,

this is suspicious. You do not actually whether US_FL_NO_WP_DETECT
by itself would make the device work. Can you please test that?
You will need the attached patch for the quirk to be supported.

	Regards
		Oliver

From 1ff6c9c9cc66ddb4cf7ca95bea589d6a30c63623 Mon Sep 17 00:00:00 2001
From: Oliver Neukum <oneukum@suse.com>
Date: Thu, 17 May 2018 14:46:47 +0200
Subject: [PATCH] UAS: add support for the quirk US_FL_NO_WP_DETECT

The assumption that this quirk can be limited to old storage
devices was too optimistic.

Signed-off-by: Oliver Neukum <oneukum@suse.com>
---
 drivers/usb/storage/uas.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/storage/uas.c b/drivers/usb/storage/uas.c
index 6034c39b67d1..7ee67e8c1f1e 100644
--- a/drivers/usb/storage/uas.c
+++ b/drivers/usb/storage/uas.c
@@ -836,6 +836,10 @@ 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_NO_WP_DETECT */
+	if (devinfo->flags & US_FL_NO_WP_DETECT)
+		sdev->skip_ms_page_3f = 1;
+
 	scsi_change_queue_depth(sdev, devinfo->qdepth - 2);
 	return 0;
 }
-- 
2.13.6