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| author | Simon Guinot <sguinot@lacie.com> | 2010-10-07 16:35:40 +0200 |
|---|---|---|
| committer | Nicolas Pitre <nico@fluxnic.net> | 2010-10-07 14:00:23 -0400 |
| commit | e5971bbc1caf0ccbab3fea74fe37abb649d1c7cf (patch) | |
| tree | 727aface2c486bbea7b70f1b587497bad9885771 /drivers/leds | |
| parent | b51d92da4ebb52b61fdc99c911171562673e88ef (diff) | |
| download | lwn-e5971bbc1caf0ccbab3fea74fe37abb649d1c7cf.tar.gz lwn-e5971bbc1caf0ccbab3fea74fe37abb649d1c7cf.zip | |
leds: leds-ns2: fix private driver data storage
dev_set_drvdata() can't be used to set the driver private data pointer.
This would overwrite the led classdev object previously registered by
led_classdev_register().
Note that despite this mistake, the driver work fine because led_dat and
led_dat->cdev are at the same memory address.
Signed-off-by: Simon Guinot <sguinot@lacie.com>
Signed-off-by: Nicolas Pitre <nico@fluxnic.net>
Diffstat (limited to 'drivers/leds')
| -rw-r--r-- | drivers/leds/leds-ns2.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/leds/leds-ns2.c b/drivers/leds/leds-ns2.c index 350eb34f049c..f77d48d0b3e4 100644 --- a/drivers/leds/leds-ns2.c +++ b/drivers/leds/leds-ns2.c @@ -141,10 +141,12 @@ static ssize_t ns2_led_sata_store(struct device *dev, struct device_attribute *attr, const char *buff, size_t count) { + struct led_classdev *led_cdev = dev_get_drvdata(dev); + struct ns2_led_data *led_dat = + container_of(led_cdev, struct ns2_led_data, cdev); int ret; unsigned long enable; enum ns2_led_modes mode; - struct ns2_led_data *led_dat = dev_get_drvdata(dev); ret = strict_strtoul(buff, 10, &enable); if (ret < 0) @@ -172,7 +174,9 @@ static ssize_t ns2_led_sata_store(struct device *dev, static ssize_t ns2_led_sata_show(struct device *dev, struct device_attribute *attr, char *buf) { - struct ns2_led_data *led_dat = dev_get_drvdata(dev); + struct led_classdev *led_cdev = dev_get_drvdata(dev); + struct ns2_led_data *led_dat = + container_of(led_cdev, struct ns2_led_data, cdev); return sprintf(buf, "%d\n", led_dat->sata); } @@ -234,7 +238,6 @@ create_ns2_led(struct platform_device *pdev, struct ns2_led_data *led_dat, if (ret < 0) goto err_free_slow; - dev_set_drvdata(led_dat->cdev.dev, led_dat); ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata); if (ret < 0) goto err_free_cdev; |