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| author | Michael Buesch <mb@bu3sch.de> | 2007-11-28 17:49:34 +0100 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2007-11-29 18:08:48 -0500 |
| commit | 7f4c534178722ac9ffb4feae3a4d54e3fbe3f22c (patch) | |
| tree | 5067b23f30c5758bb6d6eee5e169afb98c98cd79 /net/rfkill | |
| parent | 8312512e81ab16d845b49d1ec695fad1c72f19f6 (diff) | |
| download | linux-stable-7f4c534178722ac9ffb4feae3a4d54e3fbe3f22c.tar.gz linux-stable-7f4c534178722ac9ffb4feae3a4d54e3fbe3f22c.tar.bz2 linux-stable-7f4c534178722ac9ffb4feae3a4d54e3fbe3f22c.zip | |
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/rfkill')
| -rw-r--r-- | net/rfkill/rfkill.c | 14 |
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, |