Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=7f4c534178722ac9ffb4feae3a4d54e3fbe3f22c
Commit:     7f4c534178722ac9ffb4feae3a4d54e3fbe3f22c
Parent:     8312512e81ab16d845b49d1ec695fad1c72f19f6
Author:     Michael Buesch <[EMAIL PROTECTED]>
AuthorDate: Wed Nov 28 17:49:34 2007 +0100
Committer:  John W. Linville <[EMAIL PROTECTED]>
CommitDate: Thu Nov 29 18:08:48 2007 -0500

    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 <[EMAIL PROTECTED]>
    Acked-by: Ivo van Doorn <[EMAIL PROTECTED]>
    Signed-off-by: John W. Linville <[EMAIL PROTECTED]>
---
 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 73d60a3..4469a7b 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,
-
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