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authorSimon Guinot <simon.guinot@sequanux.org>2013-03-19 11:07:29 -0700
committerBryan Wu <cooloney@gmail.com>2013-04-01 11:04:52 -0700
commit3de1929ba61df87a0561c4f1fb7161c401fe3d04 (patch)
tree92d07b007a17379e26fc1d77851a260ea537b519 /drivers/leds/leds-ns2.c
parentc971ff185f6443e834686f140ba6d6e341ced600 (diff)
downloadop-kernel-dev-3de1929ba61df87a0561c4f1fb7161c401fe3d04.zip
op-kernel-dev-3de1929ba61df87a0561c4f1fb7161c401fe3d04.tar.gz
leds: leds-ns2: fix oops at module removal
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>
Diffstat (limited to 'drivers/leds/leds-ns2.c')
-rw-r--r--drivers/leds/leds-ns2.c38
1 files changed, 25 insertions, 13 deletions
diff --git a/drivers/leds/leds-ns2.c b/drivers/leds/leds-ns2.c
index e02b313..70137b1 100644
--- a/drivers/leds/leds-ns2.c
+++ b/drivers/leds/leds-ns2.c
@@ -308,10 +308,21 @@ static const struct of_device_id of_ns2_leds_match[] = {
};
#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)
{
struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
- struct ns2_led_data *leds_data;
+ struct ns2_led_priv *priv;
int i;
int ret;
@@ -332,21 +343,23 @@ static int ns2_led_probe(struct platform_device *pdev)
return -EINVAL;
#endif /* CONFIG_OF_GPIO */
- leds_data = devm_kzalloc(&pdev->dev, sizeof(struct ns2_led_data) *
- pdata->num_leds, GFP_KERNEL);
- if (!leds_data)
+ priv = devm_kzalloc(&pdev->dev,
+ sizeof_ns2_led_priv(pdata->num_leds), GFP_KERNEL);
+ if (!priv)
return -ENOMEM;
+ priv->num_leds = pdata->num_leds;
- for (i = 0; i < pdata->num_leds; i++) {
- ret = create_ns2_led(pdev, &leds_data[i], &pdata->leds[i]);
+ for (i = 0; i < priv->num_leds; i++) {
+ ret = create_ns2_led(pdev, &priv->leds_data[i],
+ &pdata->leds[i]);
if (ret < 0) {
for (i = i - 1; i >= 0; i--)
- delete_ns2_led(&leds_data[i]);
+ delete_ns2_led(&priv->leds_data[i]);
return ret;
}
}
- platform_set_drvdata(pdev, leds_data);
+ platform_set_drvdata(pdev, priv);
return 0;
}
@@ -354,13 +367,12 @@ static int ns2_led_probe(struct platform_device *pdev)
static int ns2_led_remove(struct platform_device *pdev)
{
int i;
- struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
- struct ns2_led_data *leds_data;
+ struct ns2_led_priv *priv;
- leds_data = platform_get_drvdata(pdev);
+ priv = platform_get_drvdata(pdev);
- for (i = 0; i < pdata->num_leds; i++)
- delete_ns2_led(&leds_data[i]);
+ for (i = 0; i < priv->num_leds; i++)
+ delete_ns2_led(&priv->leds_data[i]);
platform_set_drvdata(pdev, NULL);
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