From f6e8a1d7b4c4087e13913da43deb45b3e3413f29 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Sun, 19 Feb 2012 13:10:00 +1100 Subject: [PATCH] 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 Acked-by: Evgeniy Polyakov Signed-off-by: Greg Kroah-Hartman --- drivers/w1/slaves/w1_bq27000.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/w1/slaves/w1_bq27000.c b/drivers/w1/slaves/w1_bq27000.c index 6ae60aa1315..52ad812fa1e 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; } -- 2.20.1