This is a note to let you know that I've just added the patch titled
usb: core: notify disconnection when core detects disconnect
to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From b2108f1e519e983e5dd5712b3a44f7366ab509e4 Mon Sep 17 00:00:00 2001
From: Peter Chen <peter.chen@xxxxxxxxxxxxx>
Date: Tue, 4 Nov 2014 11:14:31 +0800
Subject: usb: core: notify disconnection when core detects disconnect
It is safe to call notify disconnect when the usb core
thinks the device is disconnected.
This commit also fixes one bug found at below situation:
we have not enabled usb wakeup, we do system suspend when
there is an usb device at the port, after suspend, we plug out
the usb device, then plug in device again. At that time,
the nofity disconnect was not called at current code, as
the controller doesn't know the usb device was disconnected
during the suspend, but USB core knows the port has changed
during that periods.
So to fix this problem, and let the usb core call notify disconnect.
Cc: 3.17+ <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Peter Chen <peter.chen@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/core/hub.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 65a8e5055885..b649fef2e35d 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -4624,8 +4624,7 @@ static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus,
/* Disconnect any existing devices under this port */
if (udev) {
- if (hcd->usb_phy && !hdev->parent &&
- !(portstatus & USB_PORT_STAT_CONNECTION))
+ if (hcd->usb_phy && !hdev->parent)
usb_phy_notify_disconnect(hcd->usb_phy, udev->speed);
usb_disconnect(&port_dev->child);
}
--
2.1.3
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