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drivers/staging/iio: call mutex_unlock in error handling code

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Adjust the error handling code so that it benefits from the call to
mutex_unlock at the end of the function.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@rcu exists@
position p1;
expression E;
@@

mutex_lock@p1(E);
...
mutex_unlock(E);

@exists@
position rcu.p1;
expression E;
@@

*mutex_lock@p1(E);
... when != mutex_unlock(E);
?*return ...;
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Julia Lawall 2010-08-04 21:54:26 +02:00 committed by Greg Kroah-Hartman
parent e3a92cdedf
commit d1ae4da731
1 changed files with 17 additions and 8 deletions
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25
drivers/staging/iio/magnetometer/hmc5843.c
View File

@ -220,11 +220,15 @@ static ssize_t hmc5843_set_operating_mode(struct device *dev,
int error;
mutex_lock(&data->lock);
error = strict_strtoul(buf, 10, &operating_mode);
if (error)
return error;
if (error) {
count = error;
goto exit;
}
dev_dbg(dev, "set Conversion mode to %lu\n", operating_mode);
if (operating_mode > MODE_SLEEP)
return -EINVAL;
if (operating_mode > MODE_SLEEP) {
count = -EINVAL;
goto exit;
}
status = i2c_smbus_write_byte_data(client, this_attr->address,
operating_mode);
@ -437,18 +441,23 @@ static ssize_t set_range(struct device *dev,
int error;
mutex_lock(&data->lock);
error = strict_strtoul(buf, 10, &range);
if (error)
return error;
if (error) {
count = error;
goto exit;
}
dev_dbg(dev, "set range to %lu\n", range);
if (range > RANGE_6_5)
return -EINVAL;
if (range > RANGE_6_5) {
count = -EINVAL;
goto exit;
}
data->range = range;
range = range << RANGE_GAIN_OFFSET;
if (i2c_smbus_write_byte_data(client, this_attr->address, range))
count = -EINVAL;
exit:
mutex_unlock(&data->lock);
return count;