linux-kernel - Re: [PATCH 3/3] HID: usbhid: defer LED setting to a workqueue

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Date:	Mon, 7 Nov 2011 15:48:04 +0100
From:	Oliver Neukum <oneukum@...e.de>
To:	Daniel Kurtz <djkurtz@...omium.org>
Cc:	jkosina@...e.cz, bleung@...omium.org, stern@...land.harvard.edu,
	olofj@...omium.org, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH 3/3] HID: usbhid: defer LED setting to a workqueue

Am Dienstag, 1. November 2011, 10:25:47 schrieb Daniel Kurtz:
> Defer LED setting action to a workqueue.
> This is more likely to perform all LED change events in a single URB.
> 
> Signed-off-by: Daniel Kurtz <djkurtz@...omium.org>
> ---
>  drivers/hid/hid-input.c       |   42 ++++++++++++++++++++++++++++++++++++++++
>  drivers/hid/usbhid/hid-core.c |   43 +++++++++++++++++++++++++++++++---------
>  drivers/hid/usbhid/usbhid.h   |    2 +
>  include/linux/hid.h           |    2 +

> @@ -1292,6 +1314,7 @@ static void hid_cancel_delayed_stuff(struct usbhid_device *usbhid)
>  {
>  	del_timer_sync(&usbhid->io_retry);
>  	cancel_work_sync(&usbhid->reset_work);
> +	cancel_work_sync(&usbhid->led_work);
>  }

Hi,

this seems to introduce a race in usbhid_stop() which might fail to kill the urb
used to change the LEDs.

	Regards
		Oliver
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