redonkable/remarkable-linux
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leds: leds-ns2: fix oops at module removal

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This patch fixes a regression introduced by commit 72052fcc10
("leds: leds-ns2: add device tree binding").

When the driver is initialized with device tree data, platform_data
pointer is NULL. This causes a kernel oops at removal.

To fix this bug, num_leds is moved into driver_data and platform_data
is not longer used from ns2_led_remove().

Signed-off-by: Simon Guinot <simon.guinot@sequanux.org>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
This commit is contained in:
Simon Guinot 2013-03-19 11:07:29 -07:00 committed by Bryan Wu
parent c971ff185f
commit 3de1929ba6
1 changed files with 25 additions and 13 deletions
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38
drivers/leds/leds-ns2.c
View file

@ -308,10 +308,21 @@ static const struct of_device_id of_ns2_leds_match[] = {
}; };
#endif /* CONFIG_OF_GPIO */ #endif /* CONFIG_OF_GPIO */
struct ns2_led_priv {
int num_leds;
struct ns2_led_data leds_data[];
};
static inline int sizeof_ns2_led_priv(int num_leds)
{
return sizeof(struct ns2_led_priv) +
(sizeof(struct ns2_led_data) * num_leds);
}
static int ns2_led_probe(struct platform_device *pdev) static int ns2_led_probe(struct platform_device *pdev)
{ {
struct ns2_led_platform_data *pdata = pdev->dev.platform_data; struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
struct ns2_led_data *leds_data; struct ns2_led_priv *priv;
int i; int i;
int ret; int ret;
@ -332,21 +343,23 @@ static int ns2_led_probe(struct platform_device *pdev)
return -EINVAL; return -EINVAL;
#endif /* CONFIG_OF_GPIO */ #endif /* CONFIG_OF_GPIO */
leds_data = devm_kzalloc(&pdev->dev, sizeof(struct ns2_led_data) * priv = devm_kzalloc(&pdev->dev,
pdata->num_leds, GFP_KERNEL); sizeof_ns2_led_priv(pdata->num_leds), GFP_KERNEL);
if (!leds_data) if (!priv)
return -ENOMEM; return -ENOMEM;
priv->num_leds = pdata->num_leds;
for (i = 0; i < pdata->num_leds; i++) { for (i = 0; i < priv->num_leds; i++) {
ret = create_ns2_led(pdev, &leds_data[i], &pdata->leds[i]); ret = create_ns2_led(pdev, &priv->leds_data[i],
&pdata->leds[i]);
if (ret < 0) { if (ret < 0) {
for (i = i - 1; i >= 0; i--) for (i = i - 1; i >= 0; i--)
delete_ns2_led(&leds_data[i]); delete_ns2_led(&priv->leds_data[i]);
return ret; return ret;
} }
} }
platform_set_drvdata(pdev, leds_data); platform_set_drvdata(pdev, priv);
return 0; return 0;
} }
@ -354,13 +367,12 @@ static int ns2_led_probe(struct platform_device *pdev)
static int ns2_led_remove(struct platform_device *pdev) static int ns2_led_remove(struct platform_device *pdev)
{ {
int i; int i;
struct ns2_led_platform_data *pdata = pdev->dev.platform_data; struct ns2_led_priv *priv;
struct ns2_led_data *leds_data;
leds_data = platform_get_drvdata(pdev); priv = platform_get_drvdata(pdev);
for (i = 0; i < pdata->num_leds; i++) for (i = 0; i < priv->num_leds; i++)
delete_ns2_led(&leds_data[i]); delete_ns2_led(&priv->leds_data[i]);
platform_set_drvdata(pdev, NULL); platform_set_drvdata(pdev, NULL);