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Subject[PATCH 3/4] drivers/video/backlight: use devm_ functions
Date
From: Julia Lawall <Julia.Lawall@lip6.fr>

The various devm_ functions allocate memory that is released when a driver
detaches. This patch uses these functions for data that is allocated in
the probe function of a platform device and is only freed in the remove
function.

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>

---
drivers/video/backlight/88pm860x_bl.c | 8 ++------
drivers/video/backlight/aat2870_bl.c | 9 ++++-----
drivers/video/backlight/cr_bllcd.c | 3 +--
drivers/video/backlight/da903x_bl.c | 6 +-----
drivers/video/backlight/max8925_bl.c | 7 ++-----
drivers/video/backlight/omap1_bl.c | 9 +++------
drivers/video/backlight/pcf50633-backlight.c | 16 +++-------------
drivers/video/backlight/pwm_bl.c | 7 ++-----
8 files changed, 18 insertions(+), 47 deletions(-)

diff --git a/drivers/video/backlight/88pm860x_bl.c b/drivers/video/backlight/88pm860x_bl.c
index a1376dc..915943a 100644
--- a/drivers/video/backlight/88pm860x_bl.c
+++ b/drivers/video/backlight/88pm860x_bl.c
@@ -187,7 +187,8 @@ static int pm860x_backlight_probe(struct platform_device *pdev)
return -EINVAL;
}

- data = kzalloc(sizeof(struct pm860x_backlight_data), GFP_KERNEL);
+ data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_backlight_data),
+ GFP_KERNEL);
if (data == NULL)
return -ENOMEM;
strncpy(name, res->name, MFD_NAME_SIZE);
@@ -200,7 +201,6 @@ static int pm860x_backlight_probe(struct platform_device *pdev)
data->port = pdata->flags;
if (data->port < 0) {
dev_err(&pdev->dev, "wrong platform data is assigned");
- kfree(data);
return -EINVAL;
}

@@ -211,7 +211,6 @@ static int pm860x_backlight_probe(struct platform_device *pdev)
&pm860x_backlight_ops, &props);
if (IS_ERR(bl)) {
dev_err(&pdev->dev, "failed to register backlight\n");
- kfree(data);
return PTR_ERR(bl);
}
bl->props.brightness = MAX_BRIGHTNESS;
@@ -247,17 +246,14 @@ static int pm860x_backlight_probe(struct platform_device *pdev)
return 0;
out:
backlight_device_unregister(bl);
- kfree(data);
return ret;
}

static int pm860x_backlight_remove(struct platform_device *pdev)
{
struct backlight_device *bl = platform_get_drvdata(pdev);
- struct pm860x_backlight_data *data = bl_get_data(bl);

backlight_device_unregister(bl);
- kfree(data);
return 0;
}

diff --git a/drivers/video/backlight/aat2870_bl.c b/drivers/video/backlight/aat2870_bl.c
index 331f1ef..7ff7522 100644
--- a/drivers/video/backlight/aat2870_bl.c
+++ b/drivers/video/backlight/aat2870_bl.c
@@ -145,7 +145,9 @@ static int aat2870_bl_probe(struct platform_device *pdev)
goto out;
}

- aat2870_bl = kzalloc(sizeof(struct aat2870_bl_driver_data), GFP_KERNEL);
+ aat2870_bl = devm_kzalloc(&pdev->dev,
+ sizeof(struct aat2870_bl_driver_data),
+ GFP_KERNEL);
if (!aat2870_bl) {
dev_err(&pdev->dev,
"Failed to allocate memory for aat2870 backlight\n");
@@ -162,7 +164,7 @@ static int aat2870_bl_probe(struct platform_device *pdev)
dev_err(&pdev->dev,
"Failed allocate memory for backlight device\n");
ret = PTR_ERR(bd);
- goto out_kfree;
+ goto out;
}

aat2870_bl->pdev = pdev;
@@ -199,8 +201,6 @@ static int aat2870_bl_probe(struct platform_device *pdev)

out_bl_dev_unregister:
backlight_device_unregister(bd);
-out_kfree:
- kfree(aat2870_bl);
out:
return ret;
}
@@ -215,7 +215,6 @@ static int aat2870_bl_remove(struct platform_device *pdev)
backlight_update_status(bd);

backlight_device_unregister(bd);
- kfree(aat2870_bl);

return 0;
}
diff --git a/drivers/video/backlight/cr_bllcd.c b/drivers/video/backlight/cr_bllcd.c
index 6c8c540..22489eb 100644
--- a/drivers/video/backlight/cr_bllcd.c
+++ b/drivers/video/backlight/cr_bllcd.c
@@ -212,7 +212,7 @@ static int cr_backlight_probe(struct platform_device *pdev)
&gpio_bar);
gpio_bar &= ~0x3F;

- crp = kzalloc(sizeof(*crp), GFP_KERNEL);
+ crp = devm_kzalloc(&pdev->dev, sizeof(*crp), GFP_KERNEL);
if (!crp) {
lcd_device_unregister(ldp);
backlight_device_unregister(bdp);
@@ -243,7 +243,6 @@ static int cr_backlight_remove(struct platform_device *pdev)
backlight_device_unregister(crp->cr_backlight_device);
lcd_device_unregister(crp->cr_lcd_device);
pci_dev_put(lpc_dev);
- kfree(crp);

return 0;
}
diff --git a/drivers/video/backlight/da903x_bl.c b/drivers/video/backlight/da903x_bl.c
index abb4a06..30e1968 100644
--- a/drivers/video/backlight/da903x_bl.c
+++ b/drivers/video/backlight/da903x_bl.c
@@ -110,7 +110,7 @@ static int da903x_backlight_probe(struct platform_device *pdev)
struct backlight_properties props;
int max_brightness;

- data = kzalloc(sizeof(*data), GFP_KERNEL);
+ data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (data == NULL)
return -ENOMEM;

@@ -124,7 +124,6 @@ static int da903x_backlight_probe(struct platform_device *pdev)
default:
dev_err(&pdev->dev, "invalid backlight device ID(%d)\n",
pdev->id);
- kfree(data);
return -EINVAL;
}

@@ -143,7 +142,6 @@ static int da903x_backlight_probe(struct platform_device *pdev)
&da903x_backlight_ops, &props);
if (IS_ERR(bl)) {
dev_err(&pdev->dev, "failed to register backlight\n");
- kfree(data);
return PTR_ERR(bl);
}

@@ -157,10 +155,8 @@ static int da903x_backlight_probe(struct platform_device *pdev)
static int da903x_backlight_remove(struct platform_device *pdev)
{
struct backlight_device *bl = platform_get_drvdata(pdev);
- struct da903x_backlight_data *data = bl_get_data(bl);

backlight_device_unregister(bl);
- kfree(data);
return 0;
}

diff --git a/drivers/video/backlight/max8925_bl.c b/drivers/video/backlight/max8925_bl.c
index c915e3b..e833ac7 100644
--- a/drivers/video/backlight/max8925_bl.c
+++ b/drivers/video/backlight/max8925_bl.c
@@ -129,7 +129,8 @@ static int __devinit max8925_backlight_probe(struct platform_device *pdev)
return -EINVAL;
}

- data = kzalloc(sizeof(struct max8925_backlight_data), GFP_KERNEL);
+ data = devm_kzalloc(&pdev->dev, sizeof(struct max8925_backlight_data),
+ GFP_KERNEL);
if (data == NULL)
return -ENOMEM;
strncpy(name, res->name, MAX8925_NAME_SIZE);
@@ -143,7 +144,6 @@ static int __devinit max8925_backlight_probe(struct platform_device *pdev)
&max8925_backlight_ops, &props);
if (IS_ERR(bl)) {
dev_err(&pdev->dev, "failed to register backlight\n");
- kfree(data);
return PTR_ERR(bl);
}
bl->props.brightness = MAX_BRIGHTNESS;
@@ -165,17 +165,14 @@ static int __devinit max8925_backlight_probe(struct platform_device *pdev)
return 0;
out:
backlight_device_unregister(bl);
- kfree(data);
return ret;
}

static int __devexit max8925_backlight_remove(struct platform_device *pdev)
{
struct backlight_device *bl = platform_get_drvdata(pdev);
- struct max8925_backlight_data *data = bl_get_data(bl);

backlight_device_unregister(bl);
- kfree(data);
return 0;
}

diff --git a/drivers/video/backlight/omap1_bl.c b/drivers/video/backlight/omap1_bl.c
index d8cde27..0175bfb 100644
--- a/drivers/video/backlight/omap1_bl.c
+++ b/drivers/video/backlight/omap1_bl.c
@@ -141,7 +141,8 @@ static int omapbl_probe(struct platform_device *pdev)
if (!pdata)
return -ENXIO;

- bl = kzalloc(sizeof(struct omap_backlight), GFP_KERNEL);
+ bl = devm_kzalloc(&pdev->dev, sizeof(struct omap_backlight),
+ GFP_KERNEL);
if (unlikely(!bl))
return -ENOMEM;

@@ -150,10 +151,8 @@ static int omapbl_probe(struct platform_device *pdev)
props.max_brightness = OMAPBL_MAX_INTENSITY;
dev = backlight_device_register("omap-bl", &pdev->dev, bl, &omapbl_ops,
&props);
- if (IS_ERR(dev)) {
- kfree(bl);
+ if (IS_ERR(dev))
return PTR_ERR(dev);
- }

bl->powermode = FB_BLANK_POWERDOWN;
bl->current_intensity = 0;
@@ -177,10 +176,8 @@ static int omapbl_probe(struct platform_device *pdev)
static int omapbl_remove(struct platform_device *pdev)
{
struct backlight_device *dev = platform_get_drvdata(pdev);
- struct omap_backlight *bl = dev_get_drvdata(&dev->dev);

backlight_device_unregister(dev);
- kfree(bl);

return 0;
}
diff --git a/drivers/video/backlight/pcf50633-backlight.c b/drivers/video/backlight/pcf50633-backlight.c
index 13e88b7..c65853c 100644
--- a/drivers/video/backlight/pcf50633-backlight.c
+++ b/drivers/video/backlight/pcf50633-backlight.c
@@ -101,14 +101,13 @@ static const struct backlight_ops pcf50633_bl_ops = {

static int __devinit pcf50633_bl_probe(struct platform_device *pdev)
{
- int ret;
struct pcf50633_bl *pcf_bl;
struct device *parent = pdev->dev.parent;
struct pcf50633_platform_data *pcf50633_data = parent->platform_data;
struct pcf50633_bl_platform_data *pdata = pcf50633_data->backlight_data;
struct backlight_properties bl_props;

- pcf_bl = kzalloc(sizeof(*pcf_bl), GFP_KERNEL);
+ pcf_bl = devm_kzalloc(&pdev->dev, sizeof(*pcf_bl), GFP_KERNEL);
if (!pcf_bl)
return -ENOMEM;

@@ -129,10 +128,8 @@ static int __devinit pcf50633_bl_probe(struct platform_device *pdev)
pcf_bl->bl = backlight_device_register(pdev->name, &pdev->dev, pcf_bl,
&pcf50633_bl_ops, &bl_props);

- if (IS_ERR(pcf_bl->bl)) {
- ret = PTR_ERR(pcf_bl->bl);
- goto err_free;
- }
+ if (IS_ERR(pcf_bl->bl))
+ return PTR_ERR(pcf_bl->bl);

platform_set_drvdata(pdev, pcf_bl);

@@ -145,11 +142,6 @@ static int __devinit pcf50633_bl_probe(struct platform_device *pdev)
backlight_update_status(pcf_bl->bl);

return 0;
-
-err_free:
- kfree(pcf_bl);
-
- return ret;
}

static int __devexit pcf50633_bl_remove(struct platform_device *pdev)
@@ -160,8 +152,6 @@ static int __devexit pcf50633_bl_remove(struct platform_device *pdev)

platform_set_drvdata(pdev, NULL);

- kfree(pcf_bl);
-
return 0;
}

diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
index 7496d04..342b7d7 100644
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c
@@ -102,7 +102,7 @@ static int pwm_backlight_probe(struct platform_device *pdev)
return ret;
}

- pb = kzalloc(sizeof(*pb), GFP_KERNEL);
+ pb = devm_kzalloc(&pdev->dev, sizeof(*pb), GFP_KERNEL);
if (!pb) {
dev_err(&pdev->dev, "no memory for state\n");
ret = -ENOMEM;
@@ -121,7 +121,7 @@ static int pwm_backlight_probe(struct platform_device *pdev)
if (IS_ERR(pb->pwm)) {
dev_err(&pdev->dev, "unable to request PWM for backlight\n");
ret = PTR_ERR(pb->pwm);
- goto err_pwm;
+ goto err_alloc;
} else
dev_dbg(&pdev->dev, "got pwm for backlight\n");

@@ -144,8 +144,6 @@ static int pwm_backlight_probe(struct platform_device *pdev)

err_bl:
pwm_free(pb->pwm);
-err_pwm:
- kfree(pb);
err_alloc:
if (data->exit)
data->exit(&pdev->dev);
@@ -162,7 +160,6 @@ static int pwm_backlight_remove(struct platform_device *pdev)
pwm_config(pb->pwm, 0, pb->period);
pwm_disable(pb->pwm);
pwm_free(pb->pwm);
- kfree(pb);
if (data->exit)
data->exit(&pdev->dev);
return 0;


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