linux-kernel - [PATCH 3/3] w1_bq27000: Only one thread can access the bq27000 at a time.

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Message-ID: <20120219021000.4958.21513.stgit@notabene.brown>
Date:	Sun, 19 Feb 2012 13:10:00 +1100
From:	NeilBrown <neilb@...e.de>
To:	Evgeniy Polyakov <zbr@...emap.net>
Cc:	GregKH <greg@...ah.com>, Thomas Weber <weber@...science.de>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	linux-kernel@...r.kernel.org, NeilBrown <neilb@...e.de>
Subject: [PATCH 3/3] w1_bq27000: Only one thread can access the bq27000 at a
 time.

If multiple threads try, they trip over each other badly.

Signed-off-by: NeilBrown <neilb@...e.de>
---

 drivers/w1/slaves/w1_bq27000.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/w1/slaves/w1_bq27000.c b/drivers/w1/slaves/w1_bq27000.c
index 6ae60aa..52ad812 100644
--- a/drivers/w1/slaves/w1_bq27000.c
+++ b/drivers/w1/slaves/w1_bq27000.c
@@ -31,8 +31,10 @@ static int w1_bq27000_read(struct device *dev, unsigned int reg)
 	u8 val;
 	struct w1_slave *sl = container_of(dev->parent, struct w1_slave, dev);
 
+	mutex_lock(&sl->master->mutex);
 	w1_write_8(sl->master, HDQ_CMD_READ | reg);
 	val = w1_read_8(sl->master);
+	mutex_unlock(&sl->master->mutex);
 
 	return val;
 }


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