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Re: [PATCH] hid: usbhid: fix possible deadlock in __usbhid_submit_report

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On Sun, Apr 22, 2012 at 1:31 AM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote:
> On Sat, 21 Apr 2012, Ming Lei wrote:
>> How about always scheduling a tasklet to run what usb_unlink_urb does?
>> just implement usb_unlink_urb as something like
>> tasklet_schedule(unlink_tasklet).
>> Then we can have a uniform lock requirement and no changes are involved
>> on host controller drivers.
> The return values would not be correct.

If you run 'git grep -n usb_unlink_urb drivers/usb/', it may show that
most of callers do not check its return value, and the others only check
for dumping warnings. If usb_unlink_urb is converted into tasklet
implementation, we still can dump these warnings inside its tasklet function.

> On the other hand, usbnet could call usb_unlink_urb from within a
> tasklet.

Sorry, you mean tasklet_schedule can't be called inside a tasklet?

Ming Lei
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