drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
In a6xx_gpu_init(), node is obtained via of_parse_phandle().
While there was a manual of_node_put() at the end of the
common path, several early error returns would bypass this call,
resulting in a reference leak.
Fix this by using the __free(device_node) cleanup handler to
release the reference when the variable goes out of scope.
Fixes: 5a903a44a984 ("drm/msm/a6xx: Introduce GMU wrapper support")
Signed-off-by: Felix Gu <ustc.gu@gmail.com>
---
Changes in v2:
- Explicitly add header file.
- Link to v1: https://lore.kernel.org/r/20260124-a6xx_gpu-v1-1-fa0c8b2dcfb1@gmail.com
---
drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index 2129d230a92b..604b0f861d27 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -9,6 +9,7 @@
#include "a6xx_gmu.xml.h"
#include <linux/bitfield.h>
+#include <linux/cleanup.h>
#include <linux/devfreq.h>
#include <linux/firmware/qcom/qcom_scm.h>
#include <linux/pm_domain.h>
@@ -2640,7 +2641,6 @@ static struct msm_gpu *a6xx_gpu_init(struct drm_device *dev)
struct msm_drm_private *priv = dev->dev_private;
struct platform_device *pdev = priv->gpu_pdev;
struct adreno_platform_config *config = pdev->dev.platform_data;
- struct device_node *node;
struct a6xx_gpu *a6xx_gpu;
struct adreno_gpu *adreno_gpu;
struct msm_gpu *gpu;
@@ -2660,7 +2660,8 @@ static struct msm_gpu *a6xx_gpu_init(struct drm_device *dev)
adreno_gpu->registers = NULL;
/* Check if there is a GMU phandle and set it up */
- node = of_parse_phandle(pdev->dev.of_node, "qcom,gmu", 0);
+ struct device_node *node __free(device_node) =
+ of_parse_phandle(pdev->dev.of_node, "qcom,gmu", 0);
/* FIXME: How do we gracefully handle this? */
BUG_ON(!node);
@@ -2702,7 +2703,6 @@ static struct msm_gpu *a6xx_gpu_init(struct drm_device *dev)
ret = a6xx_gmu_wrapper_init(a6xx_gpu, node);
else
ret = a6xx_gmu_init(a6xx_gpu, node);
- of_node_put(node);
if (ret) {
a6xx_destroy(&(a6xx_gpu->base.base));
return ERR_PTR(ret);
---
base-commit: a0c666c25aeefd16f4b088c6549a6fb6b65a8a1d
change-id: 20260123-a6xx_gpu-cbc095dbe423
Best regards,
--
Felix Gu <ustc.gu@gmail.com>On 1/24/2026 1:04 AM, Felix Gu wrote:
> In a6xx_gpu_init(), node is obtained via of_parse_phandle().
> While there was a manual of_node_put() at the end of the
> common path, several early error returns would bypass this call,
> resulting in a reference leak.
> Fix this by using the __free(device_node) cleanup handler to
> release the reference when the variable goes out of scope.
>
> Fixes: 5a903a44a984 ("drm/msm/a6xx: Introduce GMU wrapper support")
> Signed-off-by: Felix Gu <ustc.gu@gmail.com>
Reviewed-by: Akhil P Oommen <akhilpo@oss.qualcomm.com>
-Akhil
> ---
> Changes in v2:
> - Explicitly add header file.
> - Link to v1: https://lore.kernel.org/r/20260124-a6xx_gpu-v1-1-fa0c8b2dcfb1@gmail.com
> ---
> drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> index 2129d230a92b..604b0f861d27 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> @@ -9,6 +9,7 @@
> #include "a6xx_gmu.xml.h"
>
> #include <linux/bitfield.h>
> +#include <linux/cleanup.h>
> #include <linux/devfreq.h>
> #include <linux/firmware/qcom/qcom_scm.h>
> #include <linux/pm_domain.h>
> @@ -2640,7 +2641,6 @@ static struct msm_gpu *a6xx_gpu_init(struct drm_device *dev)
> struct msm_drm_private *priv = dev->dev_private;
> struct platform_device *pdev = priv->gpu_pdev;
> struct adreno_platform_config *config = pdev->dev.platform_data;
> - struct device_node *node;
> struct a6xx_gpu *a6xx_gpu;
> struct adreno_gpu *adreno_gpu;
> struct msm_gpu *gpu;
> @@ -2660,7 +2660,8 @@ static struct msm_gpu *a6xx_gpu_init(struct drm_device *dev)
> adreno_gpu->registers = NULL;
>
> /* Check if there is a GMU phandle and set it up */
> - node = of_parse_phandle(pdev->dev.of_node, "qcom,gmu", 0);
> + struct device_node *node __free(device_node) =
> + of_parse_phandle(pdev->dev.of_node, "qcom,gmu", 0);
> /* FIXME: How do we gracefully handle this? */
> BUG_ON(!node);
>
> @@ -2702,7 +2703,6 @@ static struct msm_gpu *a6xx_gpu_init(struct drm_device *dev)
> ret = a6xx_gmu_wrapper_init(a6xx_gpu, node);
> else
> ret = a6xx_gmu_init(a6xx_gpu, node);
> - of_node_put(node);
> if (ret) {
> a6xx_destroy(&(a6xx_gpu->base.base));
> return ERR_PTR(ret);
>
> ---
> base-commit: a0c666c25aeefd16f4b088c6549a6fb6b65a8a1d
> change-id: 20260123-a6xx_gpu-cbc095dbe423
>
> Best regards,
On Sat, Jan 24, 2026 at 03:34:23AM +0800, Felix Gu wrote:
> In a6xx_gpu_init(), node is obtained via of_parse_phandle().
> While there was a manual of_node_put() at the end of the
> common path, several early error returns would bypass this call,
> resulting in a reference leak.
> Fix this by using the __free(device_node) cleanup handler to
> release the reference when the variable goes out of scope.
>
> Fixes: 5a903a44a984 ("drm/msm/a6xx: Introduce GMU wrapper support")
> Signed-off-by: Felix Gu <ustc.gu@gmail.com>
> ---
> Changes in v2:
> - Explicitly add header file.
> - Link to v1: https://lore.kernel.org/r/20260124-a6xx_gpu-v1-1-fa0c8b2dcfb1@gmail.com
> ---
> drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
--
With best wishes
Dmitry
… > While there was a manual of_node_put() at the end of the > common path, several early error returns would bypass this call, … * How do you think about to benefit any more from a known text formatting parameter? https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v6.19-rc6#n659 * Were any source code analysis tools involved here? Regards, Markus
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