linux-kernel - Re: [PATCH v2] staging: comedi: dt282x: fix IRQ assignment for dev->irq.

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Date:   Mon, 9 Oct 2017 10:22:07 +0100
From:   Ian Abbott <abbotti@....co.uk>
To:     Arvind Yadav <arvind.yadav.cs@...il.com>,
        hsweeten@...ionengravers.com, gregkh@...uxfoundation.org
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] staging: comedi: dt282x: fix IRQ assignment for
 dev->irq.

On 06/10/17 19:25, Arvind Yadav wrote:
> Here, dev->irq is not assigned with irq. comedi_legacy_detach()
> is using dev->irq for release irq and dt282x_attach() is using dev->irq
> for initialize comedi_subdevice.
> 
> Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
> ---
> changes in v2:
> 	comedi_isadma_alloc() can fail. adding dev->irq assignment after
>          successful return of comedi_isadma_alloc().
> 
>   drivers/staging/comedi/drivers/dt282x.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/staging/comedi/drivers/dt282x.c b/drivers/staging/comedi/drivers/dt282x.c
> index d5295bb..217a4b8 100644
> --- a/drivers/staging/comedi/drivers/dt282x.c
> +++ b/drivers/staging/comedi/drivers/dt282x.c
> @@ -1062,6 +1062,8 @@ static void dt282x_alloc_dma(struct comedi_device *dev,
>   					   PAGE_SIZE, 0);
>   	if (!devpriv->dma)
>   		free_irq(irq_num, dev);
> +	else
> +		dev->irq = irq_num;
>   }
>   
>   static void dt282x_free_dma(struct comedi_device *dev)
> 

Good catch. Thanks!

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

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