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rfkill: fix double-mutex-locking

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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>
This commit is contained in:
Michael Buesch 2007-11-28 17:49:34 +01:00 • committed by John W. Linville
parent 8312512e81
commit 7f4c534178
1 changed files with 5 additions and 9 deletions
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14
net/rfkill/rfkill.c
View file

@ -60,11 +60,7 @@ static void rfkill_led_trigger(struct rfkill *rfkill,
static int rfkill_toggle_radio(struct rfkill *rfkill, static int rfkill_toggle_radio(struct rfkill *rfkill,
enum rfkill_state state) enum rfkill_state state)
{ {
int retval; int retval = 0;
retval = mutex_lock_interruptible(&rfkill->mutex);
if (retval)
return retval;
if (state != rfkill->state) { if (state != rfkill->state) {
retval = rfkill->toggle_radio(rfkill->data, 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; return retval;
} }
@ -158,12 +153,13 @@ static ssize_t rfkill_state_store(struct device *dev,
if (!capable(CAP_NET_ADMIN)) if (!capable(CAP_NET_ADMIN))
return -EPERM; return -EPERM;
if (mutex_lock_interruptible(&rfkill->mutex))
return -ERESTARTSYS;
error = rfkill_toggle_radio(rfkill, error = rfkill_toggle_radio(rfkill,
state ? RFKILL_STATE_ON : RFKILL_STATE_OFF); state ? RFKILL_STATE_ON : RFKILL_STATE_OFF);
if (error) mutex_unlock(&rfkill->mutex);
return error;
return count; return error ? error : count;
} }
static ssize_t rfkill_claim_show(struct device *dev, static ssize_t rfkill_claim_show(struct device *dev,