From 40a16fe835f7b3df745b4787e7f4dd958b99ac7a Mon Sep 17 00:00:00 2001 From: Alex Eickhoff Date: Tue, 22 Oct 2013 21:14:33 +0200 Subject: [PATCH] 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 Acked-by: Evgeniy Polyakov Cc: stable # 3.11+ Signed-off-by: Greg Kroah-Hartman (cherry picked from commit bc04d76d6942068f75c10790072280b847ec6f1f) --- drivers/w1/w1.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c index 0459df843c582c..15a6ddf7f3ca6e 100644 --- a/drivers/w1/w1.c +++ b/drivers/w1/w1.c @@ -680,7 +680,10 @@ 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);