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w1_bq27000: Only one thread can access the bq27000 at a time.

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

Signed-off-by: NeilBrown <neilb@suse.de>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
NeilBrown 2012-02-19 13:10:00 +11:00 committed by Greg Kroah-Hartman
parent df7019f370
commit f6e8a1d7b4
1 changed files with 2 additions and 0 deletions
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drivers/w1/slaves/w1_bq27000.c
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@ -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;
}