[PATCH v2 2/3] drm/panthor: Fix ordering in _irq_suspend()

[Steven Price]

On 25/03/2024 13:57, Boris Brezillon wrote:
> Make sure we set suspended=true last to avoid generating an irq storm
> in the unlikely case where an IRQ happens between the suspended=true
> assignment and the _INT_MASK update.
> 
> v2:
> - New patch
> 
> Reported-by: Steven Price <steven.price at arm.com>
> Signed-off-by: Boris Brezillon <boris.brezillon at collabora.com>

Reviewed-by: Steven Price <steven.price at arm.com>

Thanks!

Steve

> ---
>  drivers/gpu/drm/panthor/panthor_device.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panthor/panthor_device.h b/drivers/gpu/drm/panthor/panthor_device.h
> index 7ee4987a3796..3a930a368ae1 100644
> --- a/drivers/gpu/drm/panthor/panthor_device.h
> +++ b/drivers/gpu/drm/panthor/panthor_device.h
> @@ -325,7 +325,7 @@ static inline void panthor_ ## __name ## _irq_suspend(struct panthor_irq *pirq)
>  {												\
>  	int cookie;										\
>  												\
> -	atomic_set(&pirq->suspended, true);							\
> +	pirq->mask = 0;										\
>  												\
>  	if (drm_dev_enter(&pirq->ptdev->base, &cookie)) {					\
>  		gpu_write(pirq->ptdev, __reg_prefix ## _INT_MASK, 0);				\
> @@ -333,7 +333,7 @@ static inline void panthor_ ## __name ## _irq_suspend(struct panthor_irq *pirq)
>  		drm_dev_exit(cookie);								\
>  	}											\
>  												\
> -	pirq->mask = 0;										\
> +	atomic_set(&pirq->suspended, true);							\
>  }												\
>  												\
>  static inline void panthor_ ## __name ## _irq_resume(struct panthor_irq *pirq, u32 mask)	\