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@suse.de> Acked-by: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -31,8 +31,10 @@ static int w1_bq27000_read(struct device *dev, unsigned int reg)
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u8 val;
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struct w1_slave *sl = container_of(dev->parent, struct w1_slave, dev);
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mutex_lock(&sl->master->mutex);
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w1_write_8(sl->master, HDQ_CMD_READ | reg);
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val = w1_read_8(sl->master);
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mutex_unlock(&sl->master->mutex);
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return val;
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}
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