[PATCH] drm/msm: make sure to not queue up recovery more than once

[Akhil P Oommen]

On 8/21/2025 6:36 PM, Antonino Maniscalco wrote:
> If two fault IRQs arrive in short succession recovery work will be
> queued up twice.
> 
> When recovery runs a second time it may end up killing an unrelated
> context.
> 
> Prevent this by masking off interrupts when triggering recovery.
> 
> Signed-off-by: Antonino Maniscalco <antomani103 at gmail.com>

Reviewed-by: Akhil P Oommen <akhilpo at oss.qualcomm.com>

-Akhil

> ---
>  drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> index 45dd5fd1c2bfcb0a01b71a326c7d95b0f9496d99..f8992a68df7fb77362273206859e696c1a52e02f 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> @@ -1727,6 +1727,9 @@ static void a6xx_fault_detect_irq(struct msm_gpu *gpu)
>  	/* Turn off the hangcheck timer to keep it from bothering us */
>  	timer_delete(&gpu->hangcheck_timer);
>  
> +	/* Turn off interrupts to avoid triggering recovery again */
> +	gpu_write(gpu, REG_A6XX_RBBM_INT_0_MASK, 0);
> +
>  	kthread_queue_work(gpu->worker, &gpu->recover_work);
>  }
>  
> 
> ---
> base-commit: ba0f4c4c0f9d0f90300578fc8d081f43be281a71
> change-id: 20250821-recovery-fix-350c07a92f97
> 
> Best regards,