1.Replacing `of_find_node_by_path("/")` with `of_root` avoids multiple
calls to `of_node_put()`.
2.Fixes potential kernel oops during early boot when memory
allocation fails while parsing CPU model from device tree.

--Replacing `of_find_node_by_path("/")` with `of_root`,

Signed-off-by: Li Jun <lijun01@kylinos.cn>
---
 arch/loongarch/kernel/env.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/arch/loongarch/kernel/env.c b/arch/loongarch/kernel/env.c
index 841206fde3ab..652456768b55 100644
--- a/arch/loongarch/kernel/env.c
+++ b/arch/loongarch/kernel/env.c
@@ -42,16 +42,15 @@ static int __init init_cpu_fullname(void)
 	int cpu, ret;
 	char *cpuname;
 	const char *model;
-	struct device_node *root;
 
 	/* Parsing cpuname from DTS model property */
-	root = of_find_node_by_path("/");
-	ret = of_property_read_string(root, "model", &model);
+	ret = of_property_read_string(of_root, "model", &model);
 	if (ret == 0) {
 		cpuname = kstrdup(model, GFP_KERNEL);
+		if (!cpuname)
+			return -ENOMEM;
 		loongson_sysconf.cpuname = strsep(&cpuname, " ");
 	}
-	of_node_put(root);
 
 	if (loongson_sysconf.cpuname && !strncmp(loongson_sysconf.cpuname, "Loongson", 8)) {
 		for (cpu = 0; cpu < NR_CPUS; cpu++)
-- 
2.34.1

Applied, thanks.

Huacai

On Fri, Mar 20, 2026 at 1:39 PM Li Jun <lijun01@kylinos.cn> wrote:
>
> 1.Replacing `of_find_node_by_path("/")` with `of_root` avoids multiple
> calls to `of_node_put()`.
> 2.Fixes potential kernel oops during early boot when memory
> allocation fails while parsing CPU model from device tree.
>
> --Replacing `of_find_node_by_path("/")` with `of_root`,
>
> Signed-off-by: Li Jun <lijun01@kylinos.cn>
> ---
>  arch/loongarch/kernel/env.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
>
> diff --git a/arch/loongarch/kernel/env.c b/arch/loongarch/kernel/env.c
> index 841206fde3ab..652456768b55 100644
> --- a/arch/loongarch/kernel/env.c
> +++ b/arch/loongarch/kernel/env.c
> @@ -42,16 +42,15 @@ static int __init init_cpu_fullname(void)
>         int cpu, ret;
>         char *cpuname;
>         const char *model;
> -       struct device_node *root;
>
>         /* Parsing cpuname from DTS model property */
> -       root = of_find_node_by_path("/");
> -       ret = of_property_read_string(root, "model", &model);
> +       ret = of_property_read_string(of_root, "model", &model);
>         if (ret == 0) {
>                 cpuname = kstrdup(model, GFP_KERNEL);
> +               if (!cpuname)
> +                       return -ENOMEM;
>                 loongson_sysconf.cpuname = strsep(&cpuname, " ");
>         }
> -       of_node_put(root);
>
>         if (loongson_sysconf.cpuname && !strncmp(loongson_sysconf.cpuname, "Loongson", 8)) {
>                 for (cpu = 0; cpu < NR_CPUS; cpu++)
> --
> 2.34.1
>
>