From 5d3987796c7a747e5ed3ded1eb64a9632d52a1a4 Mon Sep 17 00:00:00 2001
From: Oliver Neukum
Date: Fri, 18 Dec 2009 12:14:21 +0100
Subject: USB: storage: Never reset devices that will morph to an old mode

Some devices must be switched to a new mode to fully use them.
A reset would make them revert to the old mode. Therefore a reset
must not be used for error handling with such devices.

Signed-off-by: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 drivers/usb/storage/transport.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'drivers/usb/storage/transport.c')

diff --git a/drivers/usb/storage/transport.c b/drivers/usb/storage/transport.c
index cc313d16d727..468038126e5e 100644
--- a/drivers/usb/storage/transport.c
+++ b/drivers/usb/storage/transport.c
@@ -47,6 +47,8 @@
 #include <linux/errno.h>
 #include <linux/slab.h>
 
+#include <linux/usb/quirks.h>
+
 #include <scsi/scsi.h>
 #include <scsi/scsi_eh.h>
 #include <scsi/scsi_device.h>
@@ -1297,6 +1299,10 @@ int usb_stor_port_reset(struct us_data *us)
 {
 	int result;
 
+	/*for these devices we must use the class specific method */
+	if (us->pusb_dev->quirks & USB_QUIRK_RESET_MORPHS)
+		return -EPERM;
+
 	result = usb_lock_device_for_reset(us->pusb_dev, us->pusb_intf);
 	if (result < 0)
 		US_DEBUGP("unable to lock device for reset: %d\n", result);
-- 
cgit v1.2.3