linux-kernel - Re: [PATCH] serial:ifx6x60:Delete SPI timer when shut down port

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Date:	Fri, 23 Nov 2012 09:25:09 +0800
From:	chao bi <chao.bi@...el.com>
To:	Alan Cox <alan@...ux.intel.com>
Cc:	richardx.r.gorby@...el.com, jun.d.chen@...el.com,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] serial:ifx6x60:Delete SPI timer when shut down port

On Thu, 2012-11-22 at 11:06 +0000, Alan Cox wrote:
> > --- a/drivers/tty/serial/ifx6x60.c
> > +++ b/drivers/tty/serial/ifx6x60.c
> > @@ -552,7 +552,10 @@ static void ifx_port_shutdown(struct tty_port
> > *port) container_of(port, struct ifx_spi_device, tty_port);
> >  
> >  	mrdy_set_low(ifx_dev);
> > -	clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags);
> > +	if (test_and_clear_bit(IFX_SPI_STATE_TIMER_PENDING,
> > +		&ifx_dev->flags)) {
> > +		del_timer(&ifx_dev->spi_timer);
> > +	}
> 
> You don't actually need the test here as far as I can see. Providing a
> timer has been initialised (init_timer) then running del_timer is safe
> even if the timer is not currently queued or has completed.
> 
> Alan

Yes, thanks. I'll update it.

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