diff options
| author | Alexey Khoroshilov <khoroshilov@ispras.ru> | 2014-05-07 01:26:04 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-05-27 14:08:46 -0700 |
| commit | a0f104644ec27ce5bbb36e950eb426dba9a3ad44 (patch) | |
| tree | 1b6a9e19b07eda7cf09408403cb84822c58436da /drivers/w1 | |
| parent | 8a0427d192e6043834414210dd14cc1289daff18 (diff) | |
w1: do not unlock unheld list_mutex in __w1_remove_master_device()
w1_process_callbacks() expects to be called with dev->list_mutex held,
but it is the fact only in w1_process(). __w1_remove_master_device()
calls w1_process_callbacks() after it releases list_mutex.
The patch fixes __w1_remove_master_device() to acquire list_mutex
for w1_process_callbacks().
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Acked-by: David Fries <david@fries.net>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Cc: stable <stable@vger.kernel.org> # 3.15
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/w1')
| -rw-r--r-- | drivers/w1/w1.c | 2 | ||||
| -rw-r--r-- | drivers/w1/w1_int.c | 4 |
2 files changed, 6 insertions, 0 deletions
diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c index ff52618cafb..5d734152054 100644 --- a/drivers/w1/w1.c +++ b/drivers/w1/w1.c @@ -1078,6 +1078,8 @@ static void w1_search_process(struct w1_master *dev, u8 search_type) * w1_process_callbacks() - execute each dev->async_list callback entry * @dev: w1_master device * + * The w1 master list_mutex must be held. + * * Return: 1 if there were commands to executed 0 otherwise */ int w1_process_callbacks(struct w1_master *dev) diff --git a/drivers/w1/w1_int.c b/drivers/w1/w1_int.c index 9b084db739c..728039d2efe 100644 --- a/drivers/w1/w1_int.c +++ b/drivers/w1/w1_int.c @@ -219,9 +219,13 @@ void __w1_remove_master_device(struct w1_master *dev) if (msleep_interruptible(1000)) flush_signals(current); + mutex_lock(&dev->list_mutex); w1_process_callbacks(dev); + mutex_unlock(&dev->list_mutex); } + mutex_lock(&dev->list_mutex); w1_process_callbacks(dev); + mutex_unlock(&dev->list_mutex); memset(&msg, 0, sizeof(msg)); msg.id.mst.id = dev->id; |