Messages in this thread Patch in this message | | | From | NeilBrown <> | Date | Sun, 19 Feb 2012 13:10:00 +1100 | Subject | [PATCH 3/3] 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> ---
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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