linux-kernel - Re: [PATCH v2 26/31] staging/comedi/das16: Make timer initialization unconditional

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Message-ID: <70303732-0988-2f54-f572-5130e2031b3a@mev.co.uk>
Date:   Thu, 21 Sep 2017 11:33:21 +0100
From:   Ian Abbott <abbotti@....co.uk>
To:     Kees Cook <keescook@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     H Hartley Sweeten <hsweeten@...ionengravers.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 26/31] staging/comedi/das16: Make timer initialization
 unconditional

On 21/09/17 00:27, Kees Cook wrote:
> With timer initialization made unconditional, there is no reason to
> make del_timer_sync() calls conditionally, there by removing the test
> of the .data field.
> 
> Cc: Ian Abbott <abbotti@....co.uk>
> Cc: H Hartley Sweeten <hsweeten@...ionengravers.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: devel@...verdev.osuosl.org
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
>   drivers/staging/comedi/drivers/das16.c | 10 ++++------
>   1 file changed, 4 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/staging/comedi/drivers/das16.c b/drivers/staging/comedi/drivers/das16.c
> index 5d157951f63f..2b2a446af3f5 100644
> --- a/drivers/staging/comedi/drivers/das16.c
> +++ b/drivers/staging/comedi/drivers/das16.c
> @@ -934,6 +934,9 @@ static void das16_alloc_dma(struct comedi_device *dev, unsigned int dma_chan)
>   {
>   	struct das16_private_struct *devpriv = dev->private;
>   
> +	setup_timer(&devpriv->timer, das16_timer_interrupt,
> +		    (unsigned long)dev);
> +
>   	/* only DMA channels 3 and 1 are valid */
>   	if (!(dma_chan == 1 || dma_chan == 3))
>   		return;
> @@ -941,10 +944,6 @@ static void das16_alloc_dma(struct comedi_device *dev, unsigned int dma_chan)
>   	/* DMA uses two buffers */
>   	devpriv->dma = comedi_isadma_alloc(dev, 2, dma_chan, dma_chan,
>   					   DAS16_DMA_SIZE, COMEDI_ISADMA_READ);
> -	if (devpriv->dma) {
> -		setup_timer(&devpriv->timer, das16_timer_interrupt,
> -			    (unsigned long)dev);
> -	}
>   }
>   
>   static void das16_free_dma(struct comedi_device *dev)
> @@ -952,8 +951,7 @@ static void das16_free_dma(struct comedi_device *dev)
>   	struct das16_private_struct *devpriv = dev->private;
>   
>   	if (devpriv) {
> -		if (devpriv->timer.data)
> -			del_timer_sync(&devpriv->timer);
> +		del_timer_sync(&devpriv->timer);
>   		comedi_isadma_free(devpriv->dma);
>   	}
>   }
> 

That's fine.

Reviewed-by: Ian Abbott <abbotti@....co.uk>

-- 
-=( Ian Abbott @ MEV Ltd.    E-mail: <abbotti@....co.uk> )=-
-=(                          Web: http://www.mev.co.uk/  )=-