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backlight: mp3309c: Fix signedness bug in mp3309c_parse_fwnode()

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The "num_levels" variable is used to store error codes from
device_property_count_u32() so it needs to be signed.  This doesn't
cause an issue at runtime because devm_kcalloc() won't allocate negative
sizes.  However, it's still worth fixing.

Fixes: b54c828bdb ("backlight: mp3309c: Make use of device properties")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Tested-by: Flavio Suligoi <f.suligoi@asem.it>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/74347f67-360d-4513-8939-595e3c4764fa@moroto.mountain
Signed-off-by: Lee Jones <lee@kernel.org>
This commit is contained in:
Dan Carpenter 2024-03-16 12:45:27 +03:00 committed by Lee Jones
parent 13cb61bed5
commit e962f13b1e
1 changed files with 2 additions and 1 deletions
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3
drivers/video/backlight/mp3309c.c
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@ -205,8 +205,9 @@ static int mp3309c_parse_fwnode(struct mp3309c_chip *chip,
struct mp3309c_platform_data *pdata)
{
int ret, i;
unsigned int num_levels, tmp_value;
unsigned int tmp_value;
struct device *dev = chip->dev;
int num_levels;
if (!dev_fwnode(dev))
return dev_err_probe(dev, -ENODEV, "failed to get firmware node\n");