Re: [PATCH v6 1/2] Bluetooth: hci_qca: Added support for WCN3998

From: Matthias Kaehlcke
Date: Thu Mar 28 2019 - 17:23:24 EST

On Fri, Mar 29, 2019 at 05:05:49AM +0800, kbuild test robot wrote:
> Hi Harish,
>
> Thank you for the patch! Perhaps something to improve:
>
> [auto build test WARNING on bluetooth-next/master]
> [also build test WARNING on next-20190328]
> [cannot apply to v5.1-rc2]
> [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/Harish-Bandi/Bluetooth-hci_qca-Added-support-for-WCN3998/20190328-213357
> base: https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next.git master
> config: riscv-allmodconfig (attached as .config)
> compiler: riscv64-linux-gcc (GCC) 8.1.0
> reproduce:
> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> chmod +x ~/bin/make.cross
> # save the attached .config to linux build tree
> GCC_VERSION=8.1.0 make.cross ARCH=riscv
>
> 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 >>):
>
> drivers/bluetooth/btqca.c: In function 'qca_uart_setup':
> >> drivers/bluetooth/btqca.c:369:3: warning: 'rom_ver' may be used uninitialized in this function [-Wmaybe-uninitialized]
> snprintf(config.fwname, sizeof(config.fwname),
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> "qca/crnv%02x.bin", rom_ver);
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> vim +/rom_ver +369 drivers/bluetooth/btqca.c
>
> 83e81961 Ben Young Tae Kim 2015-08-10 333
> aadebac4 Balakrishna Godavarthi 2018-08-03 334 int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate,
> aadebac4 Balakrishna Godavarthi 2018-08-03 335 enum qca_btsoc_type soc_type, u32 soc_ver)
> 83e81961 Ben Young Tae Kim 2015-08-10 336 {
> 83e81961 Ben Young Tae Kim 2015-08-10 337 struct rome_config config;
> 83e81961 Ben Young Tae Kim 2015-08-10 338 int err;
> 4219d468 Balakrishna Godavarthi 2018-08-03 339 u8 rom_ver;

With the use of qca_is_wcn399x() the compiler can't determine anymore
that rom_ver is only read for WCN399x, in which case it is also
initialized. Just initialize rom_ver with 0 to keep the compiler happy.

> 83e81961 Ben Young Tae Kim 2015-08-10 340
> ba493d4f Balakrishna Godavarthi 2018-08-03 341 bt_dev_dbg(hdev, "QCA setup on UART");
> 83e81961 Ben Young Tae Kim 2015-08-10 342
> 83e81961 Ben Young Tae Kim 2015-08-10 343 config.user_baud_rate = baudrate;
> 83e81961 Ben Young Tae Kim 2015-08-10 344
> 83e81961 Ben Young Tae Kim 2015-08-10 345 /* Download rampatch file */
> 83e81961 Ben Young Tae Kim 2015-08-10 346 config.type = TLV_TYPE_PATCH;
> cc8a70bd Harish Bandi 2019-03-27 347 if (qca_is_wcn399x(soc_type)) {
> 4219d468 Balakrishna Godavarthi 2018-08-03 348 /* Firmware files to download are based on ROM version.
> 4219d468 Balakrishna Godavarthi 2018-08-03 349 * ROM version is derived from last two bytes of soc_ver.
> 4219d468 Balakrishna Godavarthi 2018-08-03 350 */
> 4219d468 Balakrishna Godavarthi 2018-08-03 351 rom_ver = ((soc_ver & 0x00000f00) >> 0x04) |
> 4219d468 Balakrishna Godavarthi 2018-08-03 352 (soc_ver & 0x0000000f);
> 4219d468 Balakrishna Godavarthi 2018-08-03 353 snprintf(config.fwname, sizeof(config.fwname),
> 4219d468 Balakrishna Godavarthi 2018-08-03 354 "qca/crbtfw%02x.tlv", rom_ver);
> 4219d468 Balakrishna Godavarthi 2018-08-03 355 } else {
> 4219d468 Balakrishna Godavarthi 2018-08-03 356 snprintf(config.fwname, sizeof(config.fwname),
> 4219d468 Balakrishna Godavarthi 2018-08-03 357 "qca/rampatch_%08x.bin", soc_ver);
> 4219d468 Balakrishna Godavarthi 2018-08-03 358 }
> 4219d468 Balakrishna Godavarthi 2018-08-03 359
> ba493d4f Balakrishna Godavarthi 2018-08-03 360 err = qca_download_firmware(hdev, &config);
> 83e81961 Ben Young Tae Kim 2015-08-10 361 if (err < 0) {
> ba493d4f Balakrishna Godavarthi 2018-08-03 362 bt_dev_err(hdev, "QCA Failed to download patch (%d)", err);
> 83e81961 Ben Young Tae Kim 2015-08-10 363 return err;
> 83e81961 Ben Young Tae Kim 2015-08-10 364 }
> 83e81961 Ben Young Tae Kim 2015-08-10 365
> 83e81961 Ben Young Tae Kim 2015-08-10 366 /* Download NVM configuration */
> 83e81961 Ben Young Tae Kim 2015-08-10 367 config.type = TLV_TYPE_NVM;
> cc8a70bd Harish Bandi 2019-03-27 368 if (qca_is_wcn399x(soc_type))
> 4219d468 Balakrishna Godavarthi 2018-08-03 @369 snprintf(config.fwname, sizeof(config.fwname),
> 4219d468 Balakrishna Godavarthi 2018-08-03 370 "qca/crnv%02x.bin", rom_ver);
> 4219d468 Balakrishna Godavarthi 2018-08-03 371 else
> 4219d468 Balakrishna Godavarthi 2018-08-03 372 snprintf(config.fwname, sizeof(config.fwname),
> 4219d468 Balakrishna Godavarthi 2018-08-03 373 "qca/nvm_%08x.bin", soc_ver);
> 4219d468 Balakrishna Godavarthi 2018-08-03 374
> ba493d4f Balakrishna Godavarthi 2018-08-03 375 err = qca_download_firmware(hdev, &config);
> 83e81961 Ben Young Tae Kim 2015-08-10 376 if (err < 0) {
> ba493d4f Balakrishna Godavarthi 2018-08-03 377 bt_dev_err(hdev, "QCA Failed to download NVM (%d)", err);
> 83e81961 Ben Young Tae Kim 2015-08-10 378 return err;
> 83e81961 Ben Young Tae Kim 2015-08-10 379 }
> 83e81961 Ben Young Tae Kim 2015-08-10 380
> 83e81961 Ben Young Tae Kim 2015-08-10 381 /* Perform HCI reset */
> ba493d4f Balakrishna Godavarthi 2018-08-03 382 err = qca_send_reset(hdev);
> 83e81961 Ben Young Tae Kim 2015-08-10 383 if (err < 0) {
> ba493d4f Balakrishna Godavarthi 2018-08-03 384 bt_dev_err(hdev, "QCA Failed to run HCI_RESET (%d)", err);
> 83e81961 Ben Young Tae Kim 2015-08-10 385 return err;
> 83e81961 Ben Young Tae Kim 2015-08-10 386 }
> 83e81961 Ben Young Tae Kim 2015-08-10 387
> ba493d4f Balakrishna Godavarthi 2018-08-03 388 bt_dev_info(hdev, "QCA setup on UART is completed");
> 83e81961 Ben Young Tae Kim 2015-08-10 389
> 83e81961 Ben Young Tae Kim 2015-08-10 390 return 0;
> 83e81961 Ben Young Tae Kim 2015-08-10 391 }
> ba493d4f Balakrishna Godavarthi 2018-08-03 392 EXPORT_SYMBOL_GPL(qca_uart_setup);
> 83e81961 Ben Young Tae Kim 2015-08-10 393
>
> :::::: The code at line 369 was first introduced by commit
> :::::: 4219d4686875fdd83df3da00fda5ff0551e0a2d7 Bluetooth: btqca: Add wcn3990 firmware download support.
>
> :::::: TO: Balakrishna Godavarthi <bgodavar@xxxxxxxxxxxxxx>
> :::::: CC: Marcel Holtmann <marcel@xxxxxxxxxxxx>
>
> ---
> 0-DAY kernel test infrastructure Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all Intel Corporation