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backlight: as3711_bl: Fix Device Tree node lookup 

Fix child-node lookup during probe, which ended up searching the whole
device tree depth-first starting at the parent rather than just matching
on its children.

To make things worse, the parent mfd node was also prematurely freed.

Cc: stable <stable@vger.kernel.org>     # 3.10
Fixes: 59eb2b5e57 ("drivers/video/backlight/as3711_bl.c: add OF support")
Signed-off-by: Johan Hovold <johan@kernel.org>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Johan Hovold 2017-11-20 11:45:44 +01:00 committed by Lee Jones
parent 840d40d941
commit 4a9c8bb2ac
1 changed files with 23 additions and 10 deletions
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33
drivers/video/backlight/as3711_bl.c
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@ -262,10 +262,10 @@ static int as3711_bl_register(struct platform_device *pdev,
static int as3711_backlight_parse_dt(struct device *dev)
{
struct as3711_bl_pdata *pdata = dev_get_platdata(dev);
struct device_node *bl =
of_find_node_by_name(dev->parent->of_node, "backlight"), *fb;
struct device_node *bl, *fb;
int ret;
bl = of_get_child_by_name(dev->parent->of_node, "backlight");
if (!bl) {
dev_dbg(dev, "backlight node not found\n");
return -ENODEV;
@ -279,7 +279,7 @@ static int as3711_backlight_parse_dt(struct device *dev)
if (pdata->su1_max_uA <= 0)
ret = -EINVAL;
if (ret < 0)
return ret;
goto err_put_bl;
}
fb = of_parse_phandle(bl, "su2-dev", 0);
@ -292,7 +292,7 @@ static int as3711_backlight_parse_dt(struct device *dev)
if (pdata->su2_max_uA <= 0)
ret = -EINVAL;
if (ret < 0)
return ret;
goto err_put_bl;
if (of_find_property(bl, "su2-feedback-voltage", NULL)) {
pdata->su2_feedback = AS3711_SU2_VOLTAGE;
@ -314,8 +314,10 @@ static int as3711_backlight_parse_dt(struct device *dev)
pdata->su2_feedback = AS3711_SU2_CURR_AUTO;
count++;
}
if (count != 1)
return -EINVAL;
if (count != 1) {
ret = -EINVAL;
goto err_put_bl;
}
count = 0;
if (of_find_property(bl, "su2-fbprot-lx-sd4", NULL)) {
@ -334,8 +336,10 @@ static int as3711_backlight_parse_dt(struct device *dev)
pdata->su2_fbprot = AS3711_SU2_GPIO4;
count++;
}
if (count != 1)
return -EINVAL;
if (count != 1) {
ret = -EINVAL;
goto err_put_bl;
}
count = 0;
if (of_find_property(bl, "su2-auto-curr1", NULL)) {
@ -355,11 +359,20 @@ static int as3711_backlight_parse_dt(struct device *dev)
* At least one su2-auto-curr* must be specified iff
* AS3711_SU2_CURR_AUTO is used
*/
if (!count ^ (pdata->su2_feedback != AS3711_SU2_CURR_AUTO))
return -EINVAL;
if (!count ^ (pdata->su2_feedback != AS3711_SU2_CURR_AUTO)) {
ret = -EINVAL;
goto err_put_bl;
}
}
of_node_put(bl);
return 0;
err_put_bl:
of_node_put(bl);
return ret;
}
static int as3711_backlight_probe(struct platform_device *pdev)