diff options
| author | Simon Guinot <sguinot@lacie.com> | 2010-09-19 15:30:59 +0200 |
|---|---|---|
| committer | Nicolas Pitre <nico@fluxnic.net> | 2010-09-19 22:43:42 -0400 |
| commit | f539dfedbd169e5ed47912bb517c75976ab556f3 (patch) | |
| tree | 2619d29fb7da50574b60a77cde5b140a256c9461 /drivers/leds | |
| parent | c4a90588fa07ea47df7a67fd6cb03d6bc0f99634 (diff) | |
| download | lwn-f539dfedbd169e5ed47912bb517c75976ab556f3.tar.gz lwn-f539dfedbd169e5ed47912bb517c75976ab556f3.zip | |
leds: leds-ns2: fix locking
This patch replace all the lock functions with the irq safe variant.
The ns2_led_{set,get}_mode() functions must be safe in all context.
For example, the trigger timer call led_set_brightness() in a softirq
context.
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, 5 insertions, 4 deletions
diff --git a/drivers/leds/leds-ns2.c b/drivers/leds/leds-ns2.c index 74dce4ba0262..350eb34f049c 100644 --- a/drivers/leds/leds-ns2.c +++ b/drivers/leds/leds-ns2.c @@ -81,7 +81,7 @@ static int ns2_led_get_mode(struct ns2_led_data *led_dat, int cmd_level; int slow_level; - read_lock(&led_dat->rw_lock); + read_lock_irq(&led_dat->rw_lock); cmd_level = gpio_get_value(led_dat->cmd); slow_level = gpio_get_value(led_dat->slow); @@ -95,7 +95,7 @@ static int ns2_led_get_mode(struct ns2_led_data *led_dat, } } - read_unlock(&led_dat->rw_lock); + read_unlock_irq(&led_dat->rw_lock); return ret; } @@ -104,8 +104,9 @@ static void ns2_led_set_mode(struct ns2_led_data *led_dat, enum ns2_led_modes mode) { int i; + unsigned long flags; - write_lock(&led_dat->rw_lock); + write_lock_irqsave(&led_dat->rw_lock, flags); for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) { if (mode == ns2_led_modval[i].mode) { @@ -116,7 +117,7 @@ static void ns2_led_set_mode(struct ns2_led_data *led_dat, } } - write_unlock(&led_dat->rw_lock); + write_unlock_irqrestore(&led_dat->rw_lock, flags); } static void ns2_led_set(struct led_classdev *led_cdev, |