lkml.org 
[lkml]   [2014]   [May]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v2] w1: do not unlock unheld list_mutex in __w1_remove_master_device()
Date
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>
---
drivers/w1/w1.c | 2 ++
drivers/w1/w1_int.c | 4 ++++
2 files changed, 6 insertions(+)

diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index ff52618cafbe..5d7341520544 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 9b084db739c7..728039d2efe1 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;
--
1.8.3.2


\
 
 \ /
  Last update: 2014-05-07 00:41    [W:0.136 / U:3.524 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site