sound/soc/codecs/rt1015.c:724:2: warning: Value stored to 'bclk_ms' is never read [clang-analyzer-deadcode.DeadStores]

From: kernel test robot
Date: Mon Aug 23 2021 - 06:39:37 EST

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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: e22ce8eb631bdc47a4a4ea7ecf4e4ba499db4f93
commit: a5db2ca51367eeafb0c4013d3a6fc58932612c03 ASoC: rt1015: remove unneeded variables in rt1015_priv
date: 8 months ago
config: arm-randconfig-c002-20210820 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project d9c5613e856cf2addfbf892fc4c1ce9ef9feceaa)
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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a5db2ca51367eeafb0c4013d3a6fc58932612c03
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout a5db2ca51367eeafb0c4013d3a6fc58932612c03
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm clang-analyzer

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

clang-analyzer warnings: (new ones prefixed by >>)
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
drivers/mtd/nand/raw/marvell_nand.c:2775:26: warning: Value stored to 'pdev' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
struct platform_device *pdev = container_of(nfc->dev,
^~~~
drivers/mtd/nand/raw/marvell_nand.c:2775:26: note: Value stored to 'pdev' during its initialization is never read
struct platform_device *pdev = container_of(nfc->dev,
^~~~
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
4 warnings generated.
sound/soc/codecs/wm8731.c:106:3: warning: Value stored to 'best' is never read [clang-analyzer-deadcode.DeadStores]
best = 0;
^ ~
sound/soc/codecs/wm8731.c:106:3: note: Value stored to 'best' is never read
best = 0;
^ ~
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
>> sound/soc/codecs/rt1015.c:724:2: warning: Value stored to 'bclk_ms' is never read [clang-analyzer-deadcode.DeadStores]
bclk_ms = frame_size > 32;
^ ~~~~~~~~~~~~~~~
sound/soc/codecs/rt1015.c:724:2: note: Value stored to 'bclk_ms' is never read
bclk_ms = frame_size > 32;
^ ~~~~~~~~~~~~~~~
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
4 warnings generated.
sound/soc/codecs/tas2770.c:50:23: warning: Value stored to 'tas2770' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
struct tas2770_priv *tas2770 =
^~~~~~~
sound/soc/codecs/tas2770.c:50:23: note: Value stored to 'tas2770' during its initialization is never read
struct tas2770_priv *tas2770 =
^~~~~~~
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (2 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.

vim +/bclk_ms +724 sound/soc/codecs/rt1015.c

df31007400c390 Jack Yu 2020-01-15 701
df31007400c390 Jack Yu 2020-01-15 702 static int rt1015_hw_params(struct snd_pcm_substream *substream,
df31007400c390 Jack Yu 2020-01-15 703 struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
df31007400c390 Jack Yu 2020-01-15 704 {
df31007400c390 Jack Yu 2020-01-15 705 struct snd_soc_component *component = dai->component;
df31007400c390 Jack Yu 2020-01-15 706 struct rt1015_priv *rt1015 = snd_soc_component_get_drvdata(component);
a5db2ca51367ee Tzung-Bi Shih 2020-12-24 707 int pre_div, bclk_ms, frame_size, lrck;
df31007400c390 Jack Yu 2020-01-15 708 unsigned int val_len = 0;
df31007400c390 Jack Yu 2020-01-15 709
a5db2ca51367ee Tzung-Bi Shih 2020-12-24 710 lrck = params_rate(params);
a5db2ca51367ee Tzung-Bi Shih 2020-12-24 711 pre_div = rl6231_get_clk_info(rt1015->sysclk, lrck);
df31007400c390 Jack Yu 2020-01-15 712 if (pre_div < 0) {
df31007400c390 Jack Yu 2020-01-15 713 dev_err(component->dev, "Unsupported clock rate\n");
df31007400c390 Jack Yu 2020-01-15 714 return -EINVAL;
df31007400c390 Jack Yu 2020-01-15 715 }
df31007400c390 Jack Yu 2020-01-15 716
df31007400c390 Jack Yu 2020-01-15 717 frame_size = snd_soc_params_to_frame_size(params);
df31007400c390 Jack Yu 2020-01-15 718 if (frame_size < 0) {
df31007400c390 Jack Yu 2020-01-15 719 dev_err(component->dev, "Unsupported frame size: %d\n",
df31007400c390 Jack Yu 2020-01-15 720 frame_size);
df31007400c390 Jack Yu 2020-01-15 721 return -EINVAL;
df31007400c390 Jack Yu 2020-01-15 722 }
df31007400c390 Jack Yu 2020-01-15 723
df31007400c390 Jack Yu 2020-01-15 @724 bclk_ms = frame_size > 32;
df31007400c390 Jack Yu 2020-01-15 725
df31007400c390 Jack Yu 2020-01-15 726 dev_dbg(component->dev, "bclk_ms is %d and pre_div is %d for iis %d\n",
df31007400c390 Jack Yu 2020-01-15 727 bclk_ms, pre_div, dai->id);
df31007400c390 Jack Yu 2020-01-15 728
df31007400c390 Jack Yu 2020-01-15 729 dev_dbg(component->dev, "lrck is %dHz and pre_div is %d for iis %d\n",
a5db2ca51367ee Tzung-Bi Shih 2020-12-24 730 lrck, pre_div, dai->id);
df31007400c390 Jack Yu 2020-01-15 731
df31007400c390 Jack Yu 2020-01-15 732 switch (params_width(params)) {
df31007400c390 Jack Yu 2020-01-15 733 case 16:
df31007400c390 Jack Yu 2020-01-15 734 break;
df31007400c390 Jack Yu 2020-01-15 735 case 20:
df31007400c390 Jack Yu 2020-01-15 736 val_len = RT1015_I2S_DL_20;
df31007400c390 Jack Yu 2020-01-15 737 break;
df31007400c390 Jack Yu 2020-01-15 738 case 24:
df31007400c390 Jack Yu 2020-01-15 739 val_len = RT1015_I2S_DL_24;
df31007400c390 Jack Yu 2020-01-15 740 break;
df31007400c390 Jack Yu 2020-01-15 741 case 8:
df31007400c390 Jack Yu 2020-01-15 742 val_len = RT1015_I2S_DL_8;
df31007400c390 Jack Yu 2020-01-15 743 break;
df31007400c390 Jack Yu 2020-01-15 744 default:
df31007400c390 Jack Yu 2020-01-15 745 return -EINVAL;
df31007400c390 Jack Yu 2020-01-15 746 }
df31007400c390 Jack Yu 2020-01-15 747
df31007400c390 Jack Yu 2020-01-15 748 snd_soc_component_update_bits(component, RT1015_TDM_MASTER,
df31007400c390 Jack Yu 2020-01-15 749 RT1015_I2S_DL_MASK, val_len);
df31007400c390 Jack Yu 2020-01-15 750 snd_soc_component_update_bits(component, RT1015_CLK2,
4b01618b624736 Jack Yu 2020-03-03 751 RT1015_FS_PD_MASK, pre_div << RT1015_FS_PD_SFT);
df31007400c390 Jack Yu 2020-01-15 752
df31007400c390 Jack Yu 2020-01-15 753 return 0;
df31007400c390 Jack Yu 2020-01-15 754 }
df31007400c390 Jack Yu 2020-01-15 755

:::::: The code at line 724 was first introduced by commit
:::::: df31007400c3905ec15b1065241baf3864decbfa ASoC: rt1015: add rt1015 amplifier driver

:::::: TO: Jack Yu <jack.yu@xxxxxxxxxxx>
:::::: CC: Mark Brown <broonie@xxxxxxxxxx>

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

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Next message: Jiri Slaby: "Re: [PATCH linux-next] serial: drop unneeded assignment"
Previous message: Valentin Schneider: "Re: [PATCH] irqchip/gic: Convert to handle_strict_flow_irq()"
Next in thread: Tzung-Bi Shih: "Re: sound/soc/codecs/rt1015.c:724:2: warning: Value stored to 'bclk_ms' is never read [clang-analyzer-deadcode.DeadStores]"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]