[patch] drm/radeon: check for allocation failure in radeon_ring_backup()

[Christian König]

On 20.07.2012 13:17, Dan Carpenter wrote:
> Static checkers complain if this we don't check for allocation failure.
> Also we can use the new kmalloc_array() function here as a cleanup.
>
> Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>
What's the benefit of using kmalloc_array instead of just kmalloc?

Anyway it's:

Reviewed-by: Christian König <christian.koenig at amd.com>

>
> diff --git a/drivers/gpu/drm/radeon/radeon_ring.c b/drivers/gpu/drm/radeon/radeon_ring.c
> index 75cbe46..5a0ef24 100644
> --- a/drivers/gpu/drm/radeon/radeon_ring.c
> +++ b/drivers/gpu/drm/radeon/radeon_ring.c
> @@ -402,7 +402,11 @@ unsigned radeon_ring_backup(struct radeon_device *rdev, struct radeon_ring *ring
>   	}
>   
>   	/* and then save the content of the ring */
> -	*data = kmalloc(size * 4, GFP_KERNEL);
> +	*data = kmalloc_array(size, sizeof(uint32_t), GFP_KERNEL);
> +	if (!*data) {
> +		mutex_unlock(&rdev->ring_lock);
> +		return 0;
> +	}
>   	for (i = 0; i < size; ++i) {
>   		(*data)[i] = ring->ring[ptr++];
>   		ptr &= ring->ptr_mask;
>