From: Oliver Neukum <oliver@neukum.org>
Date: Wed, 29 Apr 2009 15:12:12 +0000 (+0200)
Subject: HID: fix possible deadlock in usbhid_close()
X-Git-Tag: v2.6.30-rc5~58^2~1
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=89092ddd7aca598e3b8874f7a49216e7917d8f3f;p=platform%2Fkernel%2Flinux-stable.git

HID: fix possible deadlock in usbhid_close()

This patch switches usbhid_close() from flush_scheduled_work() to canceling
the outstanding work. This fixes a possible deadlock due to work taking
the mutex usbhid_close() holds. Lockdep reported the problem.

Signed-off-by: Oliver Neukum <oliver@neukum.org>

--
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---

diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index 4306cb1..900ce18 100644
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -662,8 +662,8 @@ void usbhid_close(struct hid_device *hid)
 	spin_lock_irq(&usbhid->lock);
 	if (!--hid->open) {
 		spin_unlock_irq(&usbhid->lock);
+		hid_cancel_delayed_stuff(usbhid);
 		usb_kill_urb(usbhid->urbin);
-		flush_scheduled_work();
 		usbhid->intf->needs_remote_wakeup = 0;
 	} else {
 		spin_unlock_irq(&usbhid->lock);