2023-07-12 14:03:02

by Wang Ming

Subject: [PATCH v1] bus:Fix error checking for debugfs_create_dir() in mvebu_mbus_debugfs_init()

debugfs_create_dir() does not return NULL,but it is
possible to return error pointer. Most incorrect error checks
were fixed,but the one in mvebu_mbus_debugfs_init() was forgotten.

Fix the remaining error check.

Signed-off-by: Wang Ming <[email protected]>
---
drivers/bus/mvebu-mbus.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/bus/mvebu-mbus.c b/drivers/bus/mvebu-mbus.c
index 00cb792bda18..4c514894cc1f 100644
--- a/drivers/bus/mvebu-mbus.c
+++ b/drivers/bus/mvebu-mbus.c
@@ -993,7 +993,7 @@ static __init int mvebu_mbus_debugfs_init(void)
return 0;

s->debugfs_root = debugfs_create_dir("mvebu-mbus", NULL);
- if (s->debugfs_root) {
+ if (!IS_ERR(s->debugfs_root)) {
s->debugfs_sdram = debugfs_create_file("sdram", S_IRUGO,
s->debugfs_root, NULL,
&mvebu_sdram_debug_fops);
--
2.25.1

2023-08-04 16:30:06

by Greg Kroah-Hartman

Subject: Re: [PATCH v1] bus:Fix error checking for debugfs_create_dir() in mvebu_mbus_debugfs_init()

On Wed, Jul 12, 2023 at 09:23:28PM +0800, Wang Ming wrote:
> debugfs_create_dir() does not return NULL,but it is
> possible to return error pointer. Most incorrect error checks
> were fixed,but the one in mvebu_mbus_debugfs_init() was forgotten.
>
> Fix the remaining error check.
>
> Signed-off-by: Wang Ming <[email protected]>
> ---
> drivers/bus/mvebu-mbus.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/bus/mvebu-mbus.c b/drivers/bus/mvebu-mbus.c
> index 00cb792bda18..4c514894cc1f 100644
> --- a/drivers/bus/mvebu-mbus.c
> +++ b/drivers/bus/mvebu-mbus.c
> @@ -993,7 +993,7 @@ static __init int mvebu_mbus_debugfs_init(void)
> return 0;
>
> s->debugfs_root = debugfs_create_dir("mvebu-mbus", NULL);
> - if (s->debugfs_root) {
> + if (!IS_ERR(s->debugfs_root)) {

No need for this check at all.

thanks,

greg k-h