This is a note to let you know that I've just added the patch titled
usb:hub set hub->change_bits when over-current happens
to the 3.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-hub-set-hub-change_bits-when-over-current-happens.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 08d1dec6f4054e3613f32051d9b149d4203ce0d2 Mon Sep 17 00:00:00 2001
From: Shen Guang <shenguang10@xxxxxxxxx>
Date: Wed, 8 Jan 2014 14:45:42 +0800
Subject: usb:hub set hub->change_bits when over-current happens
From: Shen Guang <shenguang10@xxxxxxxxx>
commit 08d1dec6f4054e3613f32051d9b149d4203ce0d2 upstream.
When we are doing compliance test with xHCI, we found that if we
enable CONFIG_USB_SUSPEND and plug in a bad device which causes
over-current condition to the root port, software will not be noticed.
The reason is that current code don't set hub->change_bits in
hub_activate() when over-current happens, and then hub_events() will
not check the port status because it thinks nothing changed.
If CONFIG_USB_SUSPEND is disabled, the interrupt pipe of the hub will
report the change and set hub->event_bits, and then hub_events() will
check what events happened.In this case over-current can be detected.
Signed-off-by: Shen Guang <shenguang10@xxxxxxxxx>
Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Acked-by: Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx>
Cc: Frans Klaver <fransklaver@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/core/hub.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1165,7 +1165,8 @@ static void hub_activate(struct usb_hub
/* Tell khubd to disconnect the device or
* check for a new connection
*/
- if (udev || (portstatus & USB_PORT_STAT_CONNECTION))
+ if (udev || (portstatus & USB_PORT_STAT_CONNECTION) ||
+ (portstatus & USB_PORT_STAT_OVERCURRENT))
set_bit(port1, hub->change_bits);
} else if (portstatus & USB_PORT_STAT_ENABLE) {
Patches currently in stable-queue which might be from shenguang10@xxxxxxxxx are
queue-3.10/usb-hub-set-hub-change_bits-when-over-current-happens.patch
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