linux-kernel - [PATCH 3.12 030/118] usb: hub: Use correct reset for wedged USB3 devices that are NOTATTACHED

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Message-Id: <20131218211220.329337986@linuxfoundation.org>
Date:	Wed, 18 Dec 2013 13:11:07 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Julius Werner <jwerner@...omium.org>,
	Alan Stern <stern@...land.harvard.edu>
Subject: [PATCH 3.12 030/118] usb: hub: Use correct reset for wedged USB3 devices that are NOTATTACHED

3.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Julius Werner <jwerner@...omium.org>

commit 2d51f3cd11f414c56a87dc018196b85fd50b04a4 upstream.

This patch adds a check for USB_STATE_NOTATTACHED to the
hub_port_warm_reset_required() workaround for ports that end up in
Compliance Mode in hub_events() when trying to decide which reset
function to use. Trying to call usb_reset_device() with a NOTATTACHED
device will just fail and leave the port broken.

Signed-off-by: Julius Werner <jwerner@...omium.org>
Acked-by: Alan Stern <stern@...land.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/core/hub.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -4836,8 +4836,9 @@ static void hub_events(void)
 					hub->ports[i - 1]->child;
 
 				dev_dbg(hub_dev, "warm reset port %d\n", i);
-				if (!udev || !(portstatus &
-						USB_PORT_STAT_CONNECTION)) {
+				if (!udev ||
+				    !(portstatus & USB_PORT_STAT_CONNECTION) ||
+				    udev->state == USB_STATE_NOTATTACHED) {
 					status = hub_port_reset(hub, i,
 							NULL, HUB_BH_RESET_TIME,
 							true);


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