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leds: blinkm: avoid uninitialized data use 

gcc-8 reports missing error handling in blinkm_detect, when blinkm()
fails, tmpargs[] is uninitialized:

drivers/leds/leds-blinkm.c: In function 'blinkm_detect':
drivers/leds/leds-blinkm.c:555:6: error: 'tmpargs' may be used uninitialized in this function [-Werror=maybe-uninitialized]

This adds a missing error checks.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
This commit is contained in:
Arnd Bergmann 2017-12-04 15:45:29 +01:00 committed by Jacek Anaszewski
parent a72d3b5dc6
commit e0d4229879
1 changed files with 4 additions and 0 deletions
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4
drivers/leds/leds-blinkm.c
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@ -549,8 +549,12 @@ static int blinkm_detect(struct i2c_client *client, struct i2c_board_info *info)
/* make sure the blinkM is balanced (read/writes) */
while (count > 0) {
ret = blinkm_write(client, BLM_GET_ADDR, NULL);
if (ret)
return ret;
usleep_range(5000, 10000);
ret = blinkm_read(client, BLM_GET_ADDR, tmpargs);
if (ret)
return ret;
usleep_range(5000, 10000);
if (tmpargs[0] == 0x09)
count = 0;