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authorMichael Buesch <mb@bu3sch.de>2007-11-28 17:49:34 +0100
committerJohn W. Linville <linville@tuxdriver.com>2007-11-29 18:08:48 -0500
commit7f4c534178722ac9ffb4feae3a4d54e3fbe3f22c (patch)
tree5067b23f30c5758bb6d6eee5e169afb98c98cd79 /net
parent8312512e81ab16d845b49d1ec695fad1c72f19f6 (diff)
downloadlinux-7f4c534178722ac9ffb4feae3a4d54e3fbe3f22c.tar.bz2
rfkill: fix double-mutex-locking
rfkill_toggle_radio is called from functions where rfkill->mutex is already aquired. Remove the lock from rfkill_toggle_radio() and add it to the only calling function that calls it without the lock held. Signed-off-by: Michael Buesch <mb@bu3sch.de> Acked-by: Ivo van Doorn <IvDoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net')
-rw-r--r--net/rfkill/rfkill.c14
1 files changed, 5 insertions, 9 deletions
diff --git a/net/rfkill/rfkill.c b/net/rfkill/rfkill.c
index 73d60a307129..4469a7be006c 100644
--- a/net/rfkill/rfkill.c
+++ b/net/rfkill/rfkill.c
@@ -60,11 +60,7 @@ static void rfkill_led_trigger(struct rfkill *rfkill,
static int rfkill_toggle_radio(struct rfkill *rfkill,
enum rfkill_state state)
{
- int retval;
-
- retval = mutex_lock_interruptible(&rfkill->mutex);
- if (retval)
- return retval;
+ int retval = 0;
if (state != rfkill->state) {
retval = rfkill->toggle_radio(rfkill->data, state);
@@ -74,7 +70,6 @@ static int rfkill_toggle_radio(struct rfkill *rfkill,
}
}
- mutex_unlock(&rfkill->mutex);
return retval;
}
@@ -158,12 +153,13 @@ static ssize_t rfkill_state_store(struct device *dev,
if (!capable(CAP_NET_ADMIN))
return -EPERM;
+ if (mutex_lock_interruptible(&rfkill->mutex))
+ return -ERESTARTSYS;
error = rfkill_toggle_radio(rfkill,
state ? RFKILL_STATE_ON : RFKILL_STATE_OFF);
- if (error)
- return error;
+ mutex_unlock(&rfkill->mutex);
- return count;
+ return error ? error : count;
}
static ssize_t rfkill_claim_show(struct device *dev,