Re: [PATCH] dmaengine: stm32-mdma: Remove dead code in stm32_mdma_irq_handler()

[Amelie Delaunay]

Hi Alexey,

On 6/13/22 00:23, Alexey Khoroshilov wrote:
> Local variable chan is initialized by an address of element of chan array
> that is part of stm32_mdma_device struct, so it does not make sense to
> compare chan with NULL.
>
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
>
> Signed-off-by: Alexey Khoroshilov <khoroshilov@xxxxxxxxx>
> Fixes: a4ffb13c8946 ("dmaengine: Add STM32 MDMA driver")
> ---
>   drivers/dma/stm32-mdma.c | 5 -----
>   1 file changed, 5 deletions(-)
>
> diff --git a/drivers/dma/stm32-mdma.c b/drivers/dma/stm32-mdma.c
> index caf0cce8f528..b11927ed4367 100644
> --- a/drivers/dma/stm32-mdma.c
> +++ b/drivers/dma/stm32-mdma.c
> @@ -1328,12 +1328,7 @@ static irqreturn_t stm32_mdma_irq_handler(int irq, void *devid)
>   		return IRQ_NONE;
>   	}
>   	id = __ffs(status);
> -
>   	chan = &dmadev->chan[id];
> -	if (!chan) {
> -		dev_warn(mdma2dev(dmadev), "MDMA channel not initialized\n");
> -		return IRQ_NONE;
> -	}
>   
>   	/* Handle interrupt for the channel */
>   	spin_lock(&chan->vchan.lock);

Thanks for your patch,

Reviewed-by: Amelie Delaunay <amelie.delaunay@xxxxxxxxxxx>