linux-kernel - Re: [PATCH -next] dmaengine: at_xdmac: Fix missing unlock in at_xdmac

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Message-ID: <Ygs5d3MFR7R+Z5YA@matsya>
Date:   Tue, 15 Feb 2022 10:56:15 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Yang Yingliang <yangyingliang@...wei.com>
Cc:     linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        ludovic.desroches@...rochip.com, tudor.ambarus@...rochip.com
Subject: Re: [PATCH -next] dmaengine: at_xdmac: Fix missing unlock in
 at_xdmac_tasklet()

On 07-01-22, 10:40, Yang Yingliang wrote:
> Add the missing unlock before return from at_xdmac_tasklet().

Applied, thanks

> 
> Fixes: e77e561925df ("dmaengine: at_xdmac: Fix race over irq_status")
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> ---
>  drivers/dma/at_xdmac.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c
> index a1da2b4b6d73..1476156af74b 100644
> --- a/drivers/dma/at_xdmac.c
> +++ b/drivers/dma/at_xdmac.c
> @@ -1681,8 +1681,10 @@ static void at_xdmac_tasklet(struct tasklet_struct *t)
>  		__func__, atchan->irq_status);
>  
>  	if (!(atchan->irq_status & AT_XDMAC_CIS_LIS) &&
> -	    !(atchan->irq_status & error_mask))
> +	    !(atchan->irq_status & error_mask)) {
> +		spin_unlock_irq(&atchan->lock);
>  		return;
> +	}
>  
>  	if (atchan->irq_status & error_mask)
>  		at_xdmac_handle_error(atchan);
> -- 
> 2.25.1

-- 
~Vinod