linux-kernel - [PATCH] usb:hub set hub->change_bits when over-current happens

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Date:	Wed, 8 Jan 2014 14:45:42 +0800
From:	Shen Guang <shenguang10@...il.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] usb:hub set hub->change_bits when over-current happens

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@...il.com>
---
 drivers/usb/core/hub.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index bd9dc35..98b5679 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1154,7 +1154,8 @@ static void hub_activate(struct usb_hub *hub,
enum hub_activation_type type)
                        /* 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) {
--
1.7.9.5

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