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iio: adc: at91: signedness bug in at91_adc_get_trigger_value_by_name()

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at91_adc_get_trigger_value_by_name() was returning -ENOMEM truncated to
a positive u8 and that doesn't work.  I've changed it to int and
refactored it to preserve the error code.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Tested-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Cc: Stable@vger.kernel.org
This commit is contained in:
Dan Carpenter 2014-11-06 09:13:00 +00:00 committed by Jonathan Cameron
parent 19bc4981a2
commit 4f3bcd878f
1 changed files with 8 additions and 8 deletions
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16
drivers/iio/adc/at91_adc.c
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@ -322,12 +322,11 @@ static int at91_adc_channel_init(struct iio_dev *idev)
return idev->num_channels;
}
static u8 at91_adc_get_trigger_value_by_name(struct iio_dev *idev,
static int at91_adc_get_trigger_value_by_name(struct iio_dev *idev,
struct at91_adc_trigger *triggers,
const char *trigger_name)
{
struct at91_adc_state *st = iio_priv(idev);
u8 value = 0;
int i;
for (i = 0; i < st->trigger_number; i++) {
@ -340,15 +339,16 @@ static u8 at91_adc_get_trigger_value_by_name(struct iio_dev *idev,
return -ENOMEM;
if (strcmp(trigger_name, name) == 0) {
value = triggers[i].value;
kfree(name);
break;
if (triggers[i].value == 0)
return -EINVAL;
return triggers[i].value;
}
kfree(name);
}
return value;
return -EINVAL;
}
static int at91_adc_configure_trigger(struct iio_trigger *trig, bool state)
@ -358,14 +358,14 @@ static int at91_adc_configure_trigger(struct iio_trigger *trig, bool state)
struct iio_buffer *buffer = idev->buffer;
struct at91_adc_reg_desc *reg = st->registers;
u32 status = at91_adc_readl(st, reg->trigger_register);
u8 value;
int value;
u8 bit;
value = at91_adc_get_trigger_value_by_name(idev,
st->trigger_list,
idev->trig->name);
if (value == 0)
return -EINVAL;
if (value < 0)
return value;
if (state) {
st->buffer = kmalloc(idev->scan_bytes, GFP_KERNEL);