[PATCH] leds: leds-ns2: fix locking
Simon Guinot
simon at sequanux.org
Sun Sep 19 09:51:08 EDT 2010
From: Simon Guinot <sguinot at lacie.com>
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 at lacie.com>
---
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 74dce4b..350eb34 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,
--
1.6.3.1
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