w1: Only wake up the search process if it is going to be searching

It's valid to set the search count to 0 to stop searching, so don't
wake up the search thread to not search.

Signed-off-by: David Fries <David@Fries.net>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index 67b6d5fb25bc..92766a9f8b4d 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -243,7 +243,9 @@ static ssize_t w1_master_attribute_store_search(struct device * dev,
         mutex_lock(&md->mutex);
         md->search_count = tmp;
         mutex_unlock(&md->mutex);
-        wake_up_process(md->thread);
+        /* Only wake if it is going to be searching. */
+        if (tmp)
+                wake_up_process(md->thread);
 
         return count;
 }