Hi,
On 02/06/2023 01:48, Vikram Garhwal wrote:
> Change __unflatten_device_tree() return type to integer so it can propagate
> memory allocation failure. Add panic() in dt_unflatten_host_device_tree() for
> memory allocation failure during boot.
>
> Fixes: fb97eb614acf ("xen/arm: Create a hierarchical device tree")
>
> Signed-off-by: Vikram Garhwal <vikram.garhwal@amd.com>
With Michal's remark handled (it can be done on commit):
Acked-by: Julien Grall <jgrall@amazon.com>
Cheers,
> Reviewed-by: Henry Wang <Henry.Wang@arm.com>
> ---
> xen/common/device_tree.c | 14 +++++++++++---
> 1 file changed, 11 insertions(+), 3 deletions(-)
>
> diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
> index 8da1052911..dfdb10e488 100644
> --- a/xen/common/device_tree.c
> +++ b/xen/common/device_tree.c
> @@ -2092,8 +2092,8 @@ static unsigned long __init unflatten_dt_node(const void *fdt,
> * @fdt: The fdt to expand
> * @mynodes: The device_node tree created by the call
> */
> -static void __init __unflatten_device_tree(const void *fdt,
> - struct dt_device_node **mynodes)
> +static int __init __unflatten_device_tree(const void *fdt,
> + struct dt_device_node **mynodes)
> {
> unsigned long start, mem, size;
> struct dt_device_node **allnextp = mynodes;
> @@ -2114,6 +2114,8 @@ static void __init __unflatten_device_tree(const void *fdt,
>
> /* Allocate memory for the expanded device tree */
> mem = (unsigned long)_xmalloc (size + 4, __alignof__(struct dt_device_node));
> + if ( !mem )
> + return -ENOMEM;
>
> ((__be32 *)mem)[size / 4] = cpu_to_be32(0xdeadbeef);
>
> @@ -2131,6 +2133,8 @@ static void __init __unflatten_device_tree(const void *fdt,
> *allnextp = NULL;
>
> dt_dprintk(" <- unflatten_device_tree()\n");
> +
> + return 0;
> }
>
> static void dt_alias_add(struct dt_alias_prop *ap,
> @@ -2215,7 +2219,11 @@ dt_find_interrupt_controller(const struct dt_device_match *matches)
>
> void __init dt_unflatten_host_device_tree(void)
> {
> - __unflatten_device_tree(device_tree_flattened, &dt_host);
> + int error = __unflatten_device_tree(device_tree_flattened, &dt_host);
> +
> + if ( error )
> + panic("__unflatten_device_tree failed with error %d\n", error);
> +
> dt_alias_scan();
> }
>
--
Julien Grall