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SubjectRe: [linux-pm] wacom + runtime PM = AA deadlock
On Mon, 13 Sep 2010, Oliver Neukum wrote:

> PM in this driver looks broken. Please try this.
> In short you want to drop the PM reference and depend on remote
> wakeup and busy marking for this driver. Currently it gets a reference
> on every open() but never drops it.
> For locking you depend on the PM core's internal lock. You simply
> make sure you have a PM reference during open() and close()

Is there any point in resuming the device during close() just in order
to kill the interrupt URB? It seems counterproductive -- if the device
had been suspended then there wouldn't be any interrupt URB to kill in
the first place.

Alan Stern

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