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 <[email protected]> Acked-by: Evgeniy Polyakov <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
hanmiltonxing · Feb 24, 2012 · f6e8a1d · f6e8a1d
1 parent df7019f
commit f6e8a1d
Showing 1 changed file with 2 additions and 0 deletions.
diff --git 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;
 }