Re: [PATCH] NFC: Driver for Inside Secure MicroRead NFC chip

[Mark Brown]

On Fri, Mar 18, 2011 at 01:19:53PM +0100, Arnd Bergmann wrote:
> On Friday 18 March 2011, Waldemar Rymarkiewicz wrote:

> > +
> > +	mutex_lock(&info->rx_mutex);
> > +	info->irq_state = 1;
> > +	mutex_unlock(&info->rx_mutex);
> > +
> > +	wake_up_interruptible(&info->rx_waitq);
> > +
> > +	return IRQ_HANDLED;
> > +}

> You cannot take a mutex from interrupt context, that may
> cause deadlocks.

This is a threaded IRQ handler so mutexes are fine.
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