w1 - call request_module with w1 master mutex unlocked

request_module for w1 slave modules needs to be called with the w1
master mutex unlocked. Because w1_attach_slave_device gets always(?)
called with mutex locked, we need to temporarily unlock the w1 master
mutex for the loading of the w1 slave module.

Signed-off by: Hans-Frieder Vogt <hfvogt@gmx.net>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Cc: stable <stable@vger.kernel.org> # 3.11+

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index 0781217d2396..fa932c2f7d97 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -716,7 +716,10 @@ static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn)
         atomic_set(&sl->refcnt, 0);
         init_completion(&sl->released);
 
+        /* slave modules need to be loaded in a context with unlocked mutex */
+        mutex_unlock(&dev->mutex);
         request_module("w1-family-0x%0x", rn->family);
+        mutex_lock(&dev->mutex);
 
         spin_lock(&w1_flock);
         f = w1_family_registered(rn->family);