[PATCH 1/2] iommu: apple: Mark device with DM_FLAG_VITAL

[Mark Kettenis]

> From: Janne Grunau <j at jannau.net>
> Date: Thu, 31 Oct 2024 23:48:01 +0100
> 
> Avoids NULL pointer dereferences in apple_dart_unmap when the iommu
> device is removed before its user. U-boot's device model does not track
> dependencies between devices.
> Observed on a M1 Ultra Mac Studio with v2024.10.
> 
> Signed-off-by: Janne Grunau <j at jannau.net>

Acked-by: Mark Kettenis <kettenis at openbsd.org>

> ---
>  drivers/iommu/apple_dart.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iommu/apple_dart.c b/drivers/iommu/apple_dart.c
> index 611ac7cd6deb4fccd45ccfe8cbb9b3e36e2af753..9df174f32d721c39079e65736c91e3e27a72ace2 100644
> --- a/drivers/iommu/apple_dart.c
> +++ b/drivers/iommu/apple_dart.c
> @@ -312,5 +312,5 @@ U_BOOT_DRIVER(apple_dart) = {
>  	.ops = &apple_dart_ops,
>  	.probe = apple_dart_probe,
>  	.remove = apple_dart_remove,
> -	.flags	= DM_FLAG_OS_PREPARE
> +	.flags	= DM_FLAG_OS_PREPARE | DM_FLAG_VITAL
>  };
> 
> -- 
> 2.47.0
> 
>