From: Michael Buesch Date: Wed, 28 Nov 2007 16:49:34 +0000 (+0100) Subject: rfkill: fix double-mutex-locking X-Git-Tag: v2.6.24-rc4~8^2~8^2~1 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7f4c534178722ac9ffb4feae3a4d54e3fbe3f22c;p=linux-2.6 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 Acked-by: Ivo van Doorn Signed-off-by: John W. Linville --- diff --git a/net/rfkill/rfkill.c b/net/rfkill/rfkill.c index 73d60a3071..4469a7be00 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,