Re: [PATCH v3 3/3] drm/panthor: Take reqs_lock in soft_reset for clearing pending_reqs

[Liviu Dudau]

On Tue, Aug 11, 2026 at 04:08:33PM +0200, Nicolas Frattaroli wrote:
> panthor_gpu_soft_reset() sets pending_reqs to 0 without taking the
> requisite reqs_lock.
> 
> Fix this by taking the lock for the duration of the modification.
> 
> Fixes: 5cd894e258c4 ("drm/panthor: Add the GPU logical block")
> Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@xxxxxxxxxxxxx>

Reviewed-by: Liviu Dudau <liviu.dudau@xxxxxxx>

Best regards,
Liviu

> ---
>  drivers/gpu/drm/panthor/panthor_gpu.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/panthor/panthor_gpu.c b/drivers/gpu/drm/panthor/panthor_gpu.c
> index cb5319d1c5de..12e7e29b35b5 100644
> --- a/drivers/gpu/drm/panthor/panthor_gpu.c
> +++ b/drivers/gpu/drm/panthor/panthor_gpu.c
> @@ -405,7 +405,10 @@ int panthor_gpu_soft_reset(struct panthor_device *ptdev)
>  		return -ETIMEDOUT;
>  	}
>  
> -	ptdev->gpu->pending_reqs = 0;
> +	scoped_guard(spinlock, &ptdev->gpu->reqs_lock) {
> +		ptdev->gpu->pending_reqs = 0;
> +	}
> +
>  	return 0;
>  }
>  
> 
> -- 
> 2.55.0
> 

-- 
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