W1: don't delay search start

Move the creation of the w1_process thread to after the device has been
initialized.  This way w1_process doesn't have to check to see if it has
been initialized and the bus search can proceed without sleeping.  That
also eliminates two checks in the w1_process loop.  The sleep now happens
at the end of the loop not the beginning.

Also added a comment for why the atomic_set was 2.

Signed-off-by: David Fries <david@fries.net>
Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 13 deletions

diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index aac03f151fe0..730faa49d8dc 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -813,21 +813,14 @@ int w1_process(void *data)
         struct w1_master *dev = (struct w1_master *) data;
 
         while (!kthread_should_stop() && !test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
+                if (dev->search_count) {
+                        mutex_lock(&dev->mutex);
+                        w1_search_process(dev, W1_SEARCH);
+                        mutex_unlock(&dev->mutex);
+                }
+
                 try_to_freeze();
                 msleep_interruptible(w1_timeout * 1000);
-
-                if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags))
-                        break;
-
-                if (!dev->initialized)
-                        continue;
-
-                if (dev->search_count == 0)
-                        continue;
-
-                mutex_lock(&dev->mutex);
-                w1_search_process(dev, W1_SEARCH);
-                mutex_unlock(&dev->mutex);
         }
 
         atomic_dec(&dev->refcnt);