A panthor group can have at most MAX_CS_PER_CSG panthor queues.

Fixes: 4bdca11507928 ("drm/panthor: Add the driver frontend block")
Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com> # v1
Reviewed-by: Steven Price <steven.price@arm.com>

---
v2:
 - move validation up to panthor_ioctl_group_create
 - add Fixes tag
---
 drivers/gpu/drm/panthor/panthor_drv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panthor/panthor_drv.c b/drivers/gpu/drm/panthor/panthor_drv.c
index 9256806eb6623..4c202fc5ce050 100644
--- a/drivers/gpu/drm/panthor/panthor_drv.c
+++ b/drivers/gpu/drm/panthor/panthor_drv.c
@@ -1094,7 +1094,7 @@ static int panthor_ioctl_group_create(struct drm_device *ddev, void *data,
 	struct drm_panthor_queue_create *queue_args;
 	int ret;
 
-	if (!args->queues.count)
+	if (!args->queues.count || args->queues.count > MAX_CS_PER_CSG)
 		return -EINVAL;
 
 	ret = PANTHOR_UOBJ_GET_ARRAY(queue_args, &args->queues);
-- 
2.51.0.338.gd7d06c2dae-goog

On 03/09/2025 20:21, Chia-I Wu wrote:
> A panthor group can have at most MAX_CS_PER_CSG panthor queues.
> 
> Fixes: 4bdca11507928 ("drm/panthor: Add the driver frontend block")
> Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
> Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com> # v1
> Reviewed-by: Steven Price <steven.price@arm.com>

Pushed to drm-misc-fixes.

Thanks,
Steve

> 
> ---
> v2:
>  - move validation up to panthor_ioctl_group_create
>  - add Fixes tag
> ---
>  drivers/gpu/drm/panthor/panthor_drv.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/panthor/panthor_drv.c b/drivers/gpu/drm/panthor/panthor_drv.c
> index 9256806eb6623..4c202fc5ce050 100644
> --- a/drivers/gpu/drm/panthor/panthor_drv.c
> +++ b/drivers/gpu/drm/panthor/panthor_drv.c
> @@ -1094,7 +1094,7 @@ static int panthor_ioctl_group_create(struct drm_device *ddev, void *data,
>  	struct drm_panthor_queue_create *queue_args;
>  	int ret;
>  
> -	if (!args->queues.count)
> +	if (!args->queues.count || args->queues.count > MAX_CS_PER_CSG)
>  		return -EINVAL;
>  
>  	ret = PANTHOR_UOBJ_GET_ARRAY(queue_args, &args->queues);