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backlight: mp3309c: Fix uninitialized local variable

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In the function "pm3309c_parse_dt_node", when the dimming analog control
mode (by I2C messages) is enabled, the local variable "prop_levels" is
tested without any initialization, as indicated by the following smatch
warning:

drivers/video/backlight/mp3309c.c:279 pm3309c_parse_dt_node() error: uninitialized symbol 'prop_levels'.

To avoid any problem in case of undefined behavior, we need to initialize
it to "NULL".

Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/dri-devel/af0a1870-693b-442f-9b11-0503cfcd944a@moroto.mountain/
Fixes: 2e914516a5 ("backlight: mp3309c: Add support for MPS MP3309C")
Signed-off-by: Flavio Suligoi <f.suligoi@asem.it>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Link: https://lore.kernel.org/r/20231129164514.2772719-1-f.suligoi@asem.it
Signed-off-by: Lee Jones <lee@kernel.org>
This commit is contained in:
Flavio Suligoi 2023-11-29 17:45:14 +01:00 committed by Lee Jones
parent 58793f263a
commit ab47505ce4
1 changed files with 2 additions and 1 deletions
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3
drivers/video/backlight/mp3309c.c
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@ -203,7 +203,8 @@ static int pm3309c_parse_dt_node(struct mp3309c_chip *chip,
struct mp3309c_platform_data *pdata)
{
struct device_node *node = chip->dev->of_node;
struct property *prop_pwms, *prop_levels;
struct property *prop_pwms;
struct property *prop_levels = NULL;
int length = 0;
int ret, i;
unsigned int num_levels, tmp_value;