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SubjectRe: [PATCH 2/4] rtc: abx80x: Enable SQW output
Hi Kirill,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on abelloni/rtc-next]
[also build test WARNING on v5.12-rc5 next-20210326]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url: https://github.com/0day-ci/linux/commits/Kirill-Kapranov/rtc-abx80x-Enable-distributed-digital-calibration/20210329-053233
base: https://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux.git rtc-next
config: arm-randconfig-r034-20210329 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 821547cabb5819ed42245376a9afcd11cdee5ddd)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install arm cross compiling tool for clang build
# apt-get install binutils-arm-linux-gnueabi
# https://github.com/0day-ci/linux/commit/3f6d456de4f347f0d2fd0af648b1ca21b1212d17
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Kirill-Kapranov/rtc-abx80x-Enable-distributed-digital-calibration/20210329-053233
git checkout 3f6d456de4f347f0d2fd0af648b1ca21b1212d17
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/rtc/rtc-abx80x.c:533:6: warning: variable 'retval' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
if (reg_sqw.val < 0)
^~~~~~~~~~~~~~~
drivers/rtc/rtc-abx80x.c:561:9: note: uninitialized use occurs here
return retval;
^~~~~~
drivers/rtc/rtc-abx80x.c:533:2: note: remove the 'if' if its condition is always false
if (reg_sqw.val < 0)
^~~~~~~~~~~~~~~~~~~~
drivers/rtc/rtc-abx80x.c:530:12: note: initialize the variable 'retval' to silence this warning
int retval;
^
= 0
1 warning generated.


vim +533 drivers/rtc/rtc-abx80x.c

526
527 static int sqw_set(struct i2c_client *client, const char *buf)
528 {
529 union abx8xx_reg_sqw reg_sqw;
530 int retval;
531
532 reg_sqw.val = i2c_smbus_read_byte_data(client, ABX8XX_REG_SQW);
> 533 if (reg_sqw.val < 0)
534 goto err;
535
536 if (sysfs_streq(buf, "none")) {
537 reg_sqw.sqwe = 0;
538 dev_info(&client->dev, "sqw output disabled\n");
539 } else {
540 int idx = __sysfs_match_string(sqfs, SQFS_COUNT, buf);
541
542 if (idx < 0)
543 return idx;
544
545 if (abx80x_is_rc_mode(client) && !valid_for_rc_mode[idx])
546 dev_warn(&client->dev, "sqw frequency %s valid only in xt mode\n",
547 sqfs[idx]);
548
549 dev_info(&client->dev, "sqw output enabled @ %s\n", sqfs[idx]);
550 reg_sqw.sqwe = 1;
551 reg_sqw.sqws = idx;
552 }
553
554 retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_SQW, reg_sqw.val);
555 if (retval < 0)
556 goto err;
557
558 return 0;
559 err:
560 dev_err(&client->dev, "Failed to set SQW\n");
561 return retval;
562

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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