linux-kernel - [PATCH 6/35] W1: w1_process, block when there's nothing to do

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Message-ID: <20080328122456.GG3613@spacedout.fries.net>
Date:	Fri, 28 Mar 2008 07:24:56 -0500
From:	David Fries <david@...es.net>
To:	linux-kernel@...r.kernel.org
Cc:	Evgeniy Polyakov <johnpol@....mipt.ru>
Subject: [PATCH 6/35] W1: w1_process, block when there's nothing to do

w1.c 1.10
Instead of sleeping with a timeout, it will now sleep with a timeout
only when there is an active bus search.  When the search is not
active it will block until something wakes it up.  kthread_stop and
changing the search_count will wake up the thread.  Now if the search
value is changed (to request a new search) it will wake up and do the
search immediately, rather than waiting for the end of the current
timeout.

Signed-off-by: David Fries <david@...es.net>
---
 drivers/w1/w1.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index 7dd34f2..5d8c2c7 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -251,6 +251,7 @@ static ssize_t w1_master_attribute_store_search(struct device * dev,
 	mutex_lock(&md->mutex);
 	md->search_count = simple_strtol(buf, NULL, 0);
 	mutex_unlock(&md->mutex);
+	wake_up_process(md->thread);
 
 	return count;
 }
@@ -828,7 +829,11 @@ int w1_process(void *data)
 		if(kthread_should_stop())
 			break;
 
-		schedule_timeout(jtime);
+		/* Only sleep when the search is active. */
+		if(dev->search_count)
+			schedule_timeout(jtime);
+		else
+			schedule();
 	}
 
 	atomic_dec(&dev->refcnt);
-- 
1.4.4.4

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