w1: introduce a slave mutex for serializing IO

[deliverable/linux.git] / drivers / w1 / w1.c

diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index 2f2e894ea0c84e23392db10c0fb4e46b25b00ab3..69075c3dfc737289023a38973ff944671de2545a 100644 (file)
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -688,6 +688,7 @@ static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn)
        memcpy(&sl->reg_num, rn, sizeof(sl->reg_num));
        atomic_set(&sl->refcnt, 0);
        init_completion(&sl->released);
+       mutex_init(&sl->mutex);
 
        spin_lock(&w1_flock);
        f = w1_family_registered(rn->family);