netdev - RE: [PATCH net] r8152: use cancel_delayed

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Message-ID: <0835B3720019904CB8F7AA43166CEEB2EC81CA@RTITMBSV03.realtek.com.tw>
Date:	Mon, 20 Oct 2014 02:19:27 +0000
From:	Hayes Wang <hayeswang@...ltek.com>
To:	Oliver Neukum <oliver@...kum.org>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	nic_swsd <nic_swsd@...ltek.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: RE: [PATCH net] r8152: use cancel_delayed_work for runtime suspend

 Oliver Neukum [mailto:oliver@...kum.org] 
> Sent: Sunday, October 19, 2014 3:48 AM
[...]
> The diagnosis is good, the fix is not good. It opens a race
> during which the queued work can touch a suspended device.

The delayed work would wake up the device by
calling usb_autopm_get_interface() before
accessing the device. Besides, there is a mutex
to avoid the race.
 
Best Regards,
Hayes
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