[PATCH 080/106] USB: EHCI: Fix resume signalling on remote wakeup

From: Luis Henriques
Date: Tue Jul 30 2013 - 05:41:40 EST -stable review patch. If anyone has any objections, please let me know.


From: Roger Quadros <rogerq@xxxxxx>

commit 47a64a13d54f6c669b00542848d5550be3d3310e upstream.

Set the ehci->resuming flag for the port we receive a remote
wakeup on so that resume signalling can be completed.

Without this, the root hub timer will not fire again to check
if the resume was completed and there will be a never-ending wait on
on the port.

This effect is only observed if the HUB IRQ IN does not come after we
have initiated the port resume.

Signed-off-by: Roger Quadros <rogerq@xxxxxx>
Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
[ luis: backported to 3.5: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
drivers/usb/host/ehci-hub.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index 349d3fe..c3a3a72 100644
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -827,6 +827,7 @@ static int ehci_hub_control (
/* resume signaling for 20 msec */
ehci->reset_done[wIndex] = jiffies
+ msecs_to_jiffies(20);
+ set_bit(wIndex, &ehci->resuming_ports);
/* check the port again */

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/