diff mbox series

drm/exynos: hdmi: don't leak enable HDMI_EN regulator if probe fails

Message ID 20200220125726.19442-1-m.szyprowski@samsung.com
State Accepted
Commit 3b6a9b19ab652efac7ad4c392add6f1235019568
Headers show
Series drm/exynos: hdmi: don't leak enable HDMI_EN regulator if probe fails | expand

Commit Message

Marek Szyprowski Feb. 20, 2020, 12:57 p.m. UTC 
Move enabling and disabling HDMI_EN optional regulator to probe() function
to keep track on the regulator status. This fixes following warning if
probe() fails (for example when I2C DDC adapter cannot be yet gathered
due to the missing driver). This fixes following warning observed on
Arndale5250 board with multi_v7_defconfig:

[drm] Failed to get ddc i2c adapter by node
------------[ cut here ]------------
WARNING: CPU: 0 PID: 214 at drivers/regulator/core.c:2051 _regulator_put+0x16c/0x184
Modules linked in: ...
CPU: 0 PID: 214 Comm: systemd-udevd Not tainted 5.6.0-rc2-next-20200219-00040-g38af1dfafdbb #7570
Hardware name: Samsung Exynos (Flattened Device Tree)
[<c0312258>] (unwind_backtrace) from [<c030cc10>] (show_stack+0x10/0x14)
[<c030cc10>] (show_stack) from [<c0f0d3a0>] (dump_stack+0xcc/0xe0)
[<c0f0d3a0>] (dump_stack) from [<c0346a58>] (__warn+0xe0/0xf8)
[<c0346a58>] (__warn) from [<c0346b20>] (warn_slowpath_fmt+0xb0/0xb8)
[<c0346b20>] (warn_slowpath_fmt) from [<c0893f58>] (_regulator_put+0x16c/0x184)
[<c0893f58>] (_regulator_put) from [<c0893f8c>] (regulator_put+0x1c/0x2c)
[<c0893f8c>] (regulator_put) from [<c09b2664>] (release_nodes+0x17c/0x200)
[<c09b2664>] (release_nodes) from [<c09aebe8>] (really_probe+0x10c/0x350)
[<c09aebe8>] (really_probe) from [<c09aefa8>] (driver_probe_device+0x60/0x1a0)
[<c09aefa8>] (driver_probe_device) from [<c09af288>] (device_driver_attach+0x58/0x60)
[<c09af288>] (device_driver_attach) from [<c09af310>] (__driver_attach+0x80/0xbc)
[<c09af310>] (__driver_attach) from [<c09ace34>] (bus_for_each_dev+0x68/0xb4)
[<c09ace34>] (bus_for_each_dev) from [<c09ae00c>] (bus_add_driver+0x130/0x1e8)
[<c09ae00c>] (bus_add_driver) from [<c09afd98>] (driver_register+0x78/0x110)
[<c09afd98>] (driver_register) from [<bf139558>] (exynos_drm_init+0xe8/0x11c [exynosdrm])
[<bf139558>] (exynos_drm_init [exynosdrm]) from [<c0302fa8>] (do_one_initcall+0x50/0x220)
[<c0302fa8>] (do_one_initcall) from [<c03dc02c>] (do_init_module+0x60/0x210)
[<c03dc02c>] (do_init_module) from [<c03daf44>] (load_module+0x1c0c/0x2310)
[<c03daf44>] (load_module) from [<c03db85c>] (sys_finit_module+0xac/0xbc)
[<c03db85c>] (sys_finit_module) from [<c0301000>] (ret_fast_syscall+0x0/0x54)
Exception stack(0xecca3fa8 to 0xecca3ff0)
...
---[ end trace 276c91214635905c ]---

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>

---
 drivers/gpu/drm/exynos/exynos_hdmi.c | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

-- 
2.17.1

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Comments

Andrzej Hajda Feb. 27, 2020, 9:03 a.m. UTC | #1 
On 20.02.2020 13:57, Marek Szyprowski wrote:
> Move enabling and disabling HDMI_EN optional regulator to probe() function
> to keep track on the regulator status. This fixes following warning if
> probe() fails (for example when I2C DDC adapter cannot be yet gathered
> due to the missing driver). This fixes following warning observed on
> Arndale5250 board with multi_v7_defconfig:
>
> [drm] Failed to get ddc i2c adapter by node
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 214 at drivers/regulator/core.c:2051 _regulator_put+0x16c/0x184
> Modules linked in: ...
> CPU: 0 PID: 214 Comm: systemd-udevd Not tainted 5.6.0-rc2-next-20200219-00040-g38af1dfafdbb #7570
> Hardware name: Samsung Exynos (Flattened Device Tree)
> [<c0312258>] (unwind_backtrace) from [<c030cc10>] (show_stack+0x10/0x14)
> [<c030cc10>] (show_stack) from [<c0f0d3a0>] (dump_stack+0xcc/0xe0)
> [<c0f0d3a0>] (dump_stack) from [<c0346a58>] (__warn+0xe0/0xf8)
> [<c0346a58>] (__warn) from [<c0346b20>] (warn_slowpath_fmt+0xb0/0xb8)
> [<c0346b20>] (warn_slowpath_fmt) from [<c0893f58>] (_regulator_put+0x16c/0x184)
> [<c0893f58>] (_regulator_put) from [<c0893f8c>] (regulator_put+0x1c/0x2c)
> [<c0893f8c>] (regulator_put) from [<c09b2664>] (release_nodes+0x17c/0x200)
> [<c09b2664>] (release_nodes) from [<c09aebe8>] (really_probe+0x10c/0x350)
> [<c09aebe8>] (really_probe) from [<c09aefa8>] (driver_probe_device+0x60/0x1a0)
> [<c09aefa8>] (driver_probe_device) from [<c09af288>] (device_driver_attach+0x58/0x60)
> [<c09af288>] (device_driver_attach) from [<c09af310>] (__driver_attach+0x80/0xbc)
> [<c09af310>] (__driver_attach) from [<c09ace34>] (bus_for_each_dev+0x68/0xb4)
> [<c09ace34>] (bus_for_each_dev) from [<c09ae00c>] (bus_add_driver+0x130/0x1e8)
> [<c09ae00c>] (bus_add_driver) from [<c09afd98>] (driver_register+0x78/0x110)
> [<c09afd98>] (driver_register) from [<bf139558>] (exynos_drm_init+0xe8/0x11c [exynosdrm])
> [<bf139558>] (exynos_drm_init [exynosdrm]) from [<c0302fa8>] (do_one_initcall+0x50/0x220)
> [<c0302fa8>] (do_one_initcall) from [<c03dc02c>] (do_init_module+0x60/0x210)
> [<c03dc02c>] (do_init_module) from [<c03daf44>] (load_module+0x1c0c/0x2310)
> [<c03daf44>] (load_module) from [<c03db85c>] (sys_finit_module+0xac/0xbc)
> [<c03db85c>] (sys_finit_module) from [<c0301000>] (ret_fast_syscall+0x0/0x54)
> Exception stack(0xecca3fa8 to 0xecca3ff0)
> ...
> ---[ end trace 276c91214635905c ]---
>
> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>


Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>

 --
Regards
Andrzej


> ---
>  drivers/gpu/drm/exynos/exynos_hdmi.c | 22 ++++++++++++----------
>  1 file changed, 12 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
> index 9ff921f43a93..f141916eade6 100644
> --- a/drivers/gpu/drm/exynos/exynos_hdmi.c
> +++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
> @@ -1805,18 +1805,10 @@ static int hdmi_resources_init(struct hdmi_context *hdata)
>  
>  	hdata->reg_hdmi_en = devm_regulator_get_optional(dev, "hdmi-en");
>  
> -	if (PTR_ERR(hdata->reg_hdmi_en) != -ENODEV) {
> +	if (PTR_ERR(hdata->reg_hdmi_en) != -ENODEV)
>  		if (IS_ERR(hdata->reg_hdmi_en))
>  			return PTR_ERR(hdata->reg_hdmi_en);
>  
> -		ret = regulator_enable(hdata->reg_hdmi_en);
> -		if (ret) {
> -			DRM_DEV_ERROR(dev,
> -				      "failed to enable hdmi-en regulator\n");
> -			return ret;
> -		}
> -	}
> -
>  	return hdmi_bridge_init(hdata);
>  }
>  
> @@ -2023,6 +2015,15 @@ static int hdmi_probe(struct platform_device *pdev)
>  		}
>  	}
>  
> +	if (!IS_ERR(hdata->reg_hdmi_en)) {
> +		ret = regulator_enable(hdata->reg_hdmi_en);
> +		if (ret) {
> +			DRM_DEV_ERROR(dev,
> +			      "failed to enable hdmi-en regulator\n");
> +			goto err_hdmiphy;
> +		}
> +	}
> +
>  	pm_runtime_enable(dev);
>  
>  	audio_infoframe = &hdata->audio.infoframe;
> @@ -2047,7 +2048,8 @@ static int hdmi_probe(struct platform_device *pdev)
>  
>  err_rpm_disable:
>  	pm_runtime_disable(dev);
> -
> +	if (!IS_ERR(hdata->reg_hdmi_en))
> +		regulator_disable(hdata->reg_hdmi_en);
>  err_hdmiphy:
>  	if (hdata->hdmiphy_port)
>  		put_device(&hdata->hdmiphy_port->dev);
diff mbox series

Patch

diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
index 9ff921f43a93..f141916eade6 100644
--- a/drivers/gpu/drm/exynos/exynos_hdmi.c
+++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
@@ -1805,18 +1805,10 @@  static int hdmi_resources_init(struct hdmi_context *hdata)
 
 	hdata->reg_hdmi_en = devm_regulator_get_optional(dev, "hdmi-en");
 
-	if (PTR_ERR(hdata->reg_hdmi_en) != -ENODEV) {
+	if (PTR_ERR(hdata->reg_hdmi_en) != -ENODEV)
 		if (IS_ERR(hdata->reg_hdmi_en))
 			return PTR_ERR(hdata->reg_hdmi_en);
 
-		ret = regulator_enable(hdata->reg_hdmi_en);
-		if (ret) {
-			DRM_DEV_ERROR(dev,
-				      "failed to enable hdmi-en regulator\n");
-			return ret;
-		}
-	}
-
 	return hdmi_bridge_init(hdata);
 }
 
@@ -2023,6 +2015,15 @@  static int hdmi_probe(struct platform_device *pdev)
 		}
 	}
 
+	if (!IS_ERR(hdata->reg_hdmi_en)) {
+		ret = regulator_enable(hdata->reg_hdmi_en);
+		if (ret) {
+			DRM_DEV_ERROR(dev,
+			      "failed to enable hdmi-en regulator\n");
+			goto err_hdmiphy;
+		}
+	}
+
 	pm_runtime_enable(dev);
 
 	audio_infoframe = &hdata->audio.infoframe;
@@ -2047,7 +2048,8 @@  static int hdmi_probe(struct platform_device *pdev)
 
 err_rpm_disable:
 	pm_runtime_disable(dev);
-
+	if (!IS_ERR(hdata->reg_hdmi_en))
+		regulator_disable(hdata->reg_hdmi_en);
 err_hdmiphy:
 	if (hdata->hdmiphy_port)
 		put_device(&hdata->hdmiphy_port->dev);