[PATCH 3/3] w1_bq27000: Only one thread can access the bq27000 at atime.

[NeilBrown]

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

Signed-off-by: NeilBrown <neilb@xxxxxxx>
---

 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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