Re: [PATCH] staging: bcm2835-audio: Disconnect and free vchi_instance on module_exit()

From: kbuild test robot
Date: Tue Apr 17 2018 - 15:57:57 EST

Hi Kirill,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on staging/staging-testing]
[also build test WARNING on v4.17-rc1]
[cannot apply to anholt/for-next]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Kirill-Marinushkin/staging-bcm2835-audio-Disconnect-and-free-vchi_instance-on-module_exit/20180417-193147
config: arm-allmodconfig
compiler: arm-linux-gnueabi-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
make.cross ARCH=arm allmodconfig
make.cross ARCH=arm

Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings

All warnings (new ones prefixed by >>):


vim +/err +307 drivers/staging/vc04_services/bcm2835-audio/bcm2835.c

325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 274
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 275 static int snd_add_child_device(struct device *device,
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 276 struct bcm2835_audio_driver *audio_driver,
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 277 u32 numchans)
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 278 {
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 279 struct snd_card *card;
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 280 struct device *child;
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 281 struct bcm2835_chip *chip;
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 282 int err, i;
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 283
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 284 child = snd_create_device(device, &audio_driver->driver,
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 285 audio_driver->driver.name);
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 286 if (IS_ERR(child)) {
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 287 dev_err(device,
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 288 "Unable to create child device %p, error %ld",
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 289 audio_driver->driver.name,
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 290 PTR_ERR(child));
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 291 return PTR_ERR(child);
23b028c8 drivers/staging/bcm2835-audio/bcm2835.c Michael Zoran 2017-01-25 292 }
23b028c8 drivers/staging/bcm2835-audio/bcm2835.c Michael Zoran 2017-01-25 293
626118b4 drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Kirill Marinushkin 2018-03-23 294 card = snd_bcm2835_card_new(child);
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 295 if (IS_ERR(card)) {
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 296 dev_err(child, "Failed to create card");
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 297 return PTR_ERR(card);
23b028c8 drivers/staging/bcm2835-audio/bcm2835.c Michael Zoran 2017-01-25 298 }
23b028c8 drivers/staging/bcm2835-audio/bcm2835.c Michael Zoran 2017-01-25 299
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 300 snd_card_set_dev(card, child);
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 301 strcpy(card->driver, audio_driver->driver.name);
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 302 strcpy(card->shortname, audio_driver->shortname);
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 303 strcpy(card->longname, audio_driver->longname);
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 304
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 305 err = snd_bcm2835_create(card, &chip);
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 306 if (err) {
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 @307 dev_err(child, "Failed to create chip, error %d\n", err);
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 308 return err;
23b028c8 drivers/staging/bcm2835-audio/bcm2835.c Michael Zoran 2017-01-25 309 }
23b028c8 drivers/staging/bcm2835-audio/bcm2835.c Michael Zoran 2017-01-25 310
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 311 chip->dev = child;
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 312
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 313 err = audio_driver->newpcm(chip, audio_driver->shortname,
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 314 audio_driver->route,
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 315 numchans);
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 316 if (err) {
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 317 dev_err(child, "Failed to create pcm, error %d\n", err);
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 318 return err;
23b028c8 drivers/staging/bcm2835-audio/bcm2835.c Michael Zoran 2017-01-25 319 }
23b028c8 drivers/staging/bcm2835-audio/bcm2835.c Michael Zoran 2017-01-25 320
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 321 err = audio_driver->newctl(chip);
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 322 if (err) {
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 323 dev_err(child, "Failed to create controls, error %d\n", err);
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 324 return err;
23b028c8 drivers/staging/bcm2835-audio/bcm2835.c Michael Zoran 2017-01-25 325 }
23b028c8 drivers/staging/bcm2835-audio/bcm2835.c Michael Zoran 2017-01-25 326
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 327 for (i = 0; i < numchans; i++)
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 328 chip->avail_substreams |= (1 << i);
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 329
23b028c8 drivers/staging/bcm2835-audio/bcm2835.c Michael Zoran 2017-01-25 330 err = snd_card_register(card);
23b028c8 drivers/staging/bcm2835-audio/bcm2835.c Michael Zoran 2017-01-25 331 if (err) {
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 332 dev_err(child, "Failed to register card, error %d\n", err);
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 333 return err;
23b028c8 drivers/staging/bcm2835-audio/bcm2835.c Michael Zoran 2017-01-25 334 }
23b028c8 drivers/staging/bcm2835-audio/bcm2835.c Michael Zoran 2017-01-25 335
626118b4 drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Kirill Marinushkin 2018-03-23 336 dev_set_drvdata(child, chip);
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 337 dev_info(child, "card created with %d channels\n", numchans);
23b028c8 drivers/staging/bcm2835-audio/bcm2835.c Michael Zoran 2017-01-25 338
23b028c8 drivers/staging/bcm2835-audio/bcm2835.c Michael Zoran 2017-01-25 339 return 0;
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 340 }
325b5b6c drivers/staging/vc04_services/bcm2835-audio/bcm2835.c Michael Zoran 2017-03-14 341

:::::: The code at line 307 was first introduced by commit
:::::: 325b5b6c96a863989078df402d1670d061f52d88 staging: bcm2835-audio: Add support for simultanous HDMI and Headphone audio

:::::: TO: Michael Zoran <mzoran@xxxxxxxxxxxx>
:::::: CC: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

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