[PATCH] watchdog: s3c2410: Fix potential deadlock on &wdt->lock

[Chengfeng Ye]

Please kindly note that I am resending the last email since it did not
reach maillist.

> Hi, Krzysztof
> Thanks for the reply.
> > This interrupt is a threaded interrupt. Therefore the
> > s3c2410wdt_keepalive() will be called again from process thread. Are you
> > sure there is deadlock?
> Is it really that s3c2410wdt_irq is a threaded interrupt? I could be wrong but I can
> see that the interrupt is registered via the following code. It is the third argument
> of devm_request_irq but not devm_request_threaded_irq or request_threaded_irq,
> as far as I know, it should be an interrupt handler for the interrupt line wdt_irq
> executed under irq context.
> ret = devm_request_irq(dev, wdt_irq, s3c2410wdt_irq, 0, pdev->name, pdev);
> > Anyway, please also strip unrelated paths and rather use function names,
> > not references to lines, because these might be not accurate.
> No problem, I will provide a new patch with the function name soon.
> Best Regards,
> Chengfeng