[PATCH 3.2 124/185] usb: hub: Use correct reset for wedged USB3devices that are NOTATTACHED

From: Ben Hutchings
Date: Sat Dec 28 2013 - 21:39:00 EST

3.2.54-rc1 review patch. If anyone has any objections, please let me know.


From: Julius Werner <jwerner@xxxxxxxxxxxx>

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@xxxxxxxxxxxx>
Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
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
@@ -3754,8 +3754,9 @@ static void hub_events(void)
hub->hdev->children[i - 1];

dev_dbg(hub_dev, "warm reset port %d\n", i);
- if (!udev || !(portstatus &
+ if (!udev ||
+ !(portstatus & USB_PORT_STAT_CONNECTION) ||
+ udev->state == USB_STATE_NOTATTACHED) {
status = hub_port_reset(hub, i,

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