Nouveau - Sep 2019 - [PATCH] drm/nouveau: add missing single_release()

When using single_open() for opening, single_release() should be
used, otherwise there is a memory leak.

This is detected by Coccinelle semantic patch.

Fixes: 6e9fc177399f ("drm/nouveau/debugfs: add copy of sysfs pstate
interface ported to debugfs")
Signed-off-by: Wei Yongjun <weiyongjun1 at huawei.com>
---
 drivers/gpu/drm/nouveau/nouveau_debugfs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/nouveau/nouveau_debugfs.c
b/drivers/gpu/drm/nouveau/nouveau_debugfs.c
index 7dfbbbc1beea..35695f493271 100644
--- a/drivers/gpu/drm/nouveau/nouveau_debugfs.c
+++ b/drivers/gpu/drm/nouveau/nouveau_debugfs.c
@@ -202,6 +202,7 @@ static const struct file_operations nouveau_pstate_fops = {
 	.open = nouveau_debugfs_pstate_open,
 	.read = seq_read,
 	.write = nouveau_debugfs_pstate_set,
+	.release = single_release,
 };
 
 static struct drm_info_list nouveau_debugfs_list[] = {

Reviewed-by: Karol Herbst <kherbst at redhat.com>

On Thu, Sep 5, 2019 at 9:14 AM Wei Yongjun <weiyongjun1 at huawei.com>
wrote:
>
> When using single_open() for opening, single_release() should be
> used, otherwise there is a memory leak.
>
> This is detected by Coccinelle semantic patch.
>
> Fixes: 6e9fc177399f ("drm/nouveau/debugfs: add copy of sysfs pstate
interface ported to debugfs")
> Signed-off-by: Wei Yongjun <weiyongjun1 at huawei.com>
> ---
>  drivers/gpu/drm/nouveau/nouveau_debugfs.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/nouveau/nouveau_debugfs.c
b/drivers/gpu/drm/nouveau/nouveau_debugfs.c
> index 7dfbbbc1beea..35695f493271 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_debugfs.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_debugfs.c
> @@ -202,6 +202,7 @@ static const struct file_operations nouveau_pstate_fops
= {
>         .open = nouveau_debugfs_pstate_open,
>         .read = seq_read,
>         .write = nouveau_debugfs_pstate_set,
> +       .release = single_release,
>  };
>
>  static struct drm_info_list nouveau_debugfs_list[] = {
>
>
>
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