[kbuild] drivers/net/dsa/qca/qca8k-8xxx.c:526:13: warning: use of uninitialized value '<unknown>' [CWE-457]

:::::: :::::: Manual check reason: "low confidence bisect report" :::::: Manual check reason: "low confidence static check warning: drivers/net/dsa/qca/qca8k-8xxx.c:526:13: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value]" :::::: BCC: lkp(a)intel.com CC: kbuild-all(a)lists.01.org CC: linux-kernel(a)vger.kernel.org TO: Christian Marangi <ansuelsmth(a)gmail.com&gt; CC: Jakub Kicinski <kuba(a)kernel.org&gt; CC: Vladimir Oltean <olteanv(a)gmail.com&gt; tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 38eddeedbbeac33f26845c29e7414b9313ea70db commit: 027152b830434e3632ad5dd678cc5d4740358dbb net: dsa: qca8k: move mib struct to common code date: 7 weeks ago :::::: branch date: 3 hours ago :::::: commit date: 7 weeks ago config: arm-randconfig-c002-20220917 compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0 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 # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 027152b830434e3632ad5dd678cc5d4740358dbb # save the config file COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross ARCH=arm KBUILD_USERCFLAGS='-fanalyzer -Wno-error' If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <lkp(a)intel.com&gt; gcc_analyzer warnings: (new ones prefixed by >>) drivers/net/dsa/qca/qca8k-8xxx.c: In function 'qca8k_busy_wait': 526 | u32 val; | ^~~ 'qca8k_mib_init': events 1-4 | | 860 | qca8k_mib_init(struct qca8k_priv *priv) | | ^~~~~~~~~~~~~~ | | | | | (1) entry to 'qca8k_mib_init' |...... | 869 | if (ret) | | ~ | | | | | (2) following 'false' branch... |...... | 872 | ret = qca8k_busy_wait(priv, QCA8K_REG_MIB, QCA8K_MIB_BUSY); | | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | | | | | (3) ...to here | | (4) calling 'qca8k_busy_wait' from 'qca8k_mib_init' | +--> 'qca8k_busy_wait': events 5-6 | | 524 | qca8k_busy_wait(struct qca8k_priv *priv, u32 reg, u32 mask) | | ^~~~~~~~~~~~~~~ | | | | | (5) entry to 'qca8k_busy_wait' | 525 | { | 526 | u32 val; | | ~~~ | | | | | (6) use of uninitialized value '<unknown>' here | drivers/net/dsa/qca/qca8k-8xxx.c: In function 'qca8k_vlan_add': drivers/net/dsa/qca/qca8k-8xxx.c:779:13: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value] 779 | u32 reg; | ^~~ 'qca8k_vlan_add': event 1 | | 779 | u32 reg; | | ^~~ | | | | | (1) use of uninitialized value '<unknown>' here | drivers/net/dsa/qca/qca8k-8xxx.c: In function 'qca8k_vlan_del': drivers/net/dsa/qca/qca8k-8xxx.c:818:13: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value] 818 | u32 reg, mask; | ^~~ 'qca8k_vlan_del': event 1 | | 818 | u32 reg, mask; | | ^~~ | | | | | (1) use of uninitialized value '<unknown>' here | drivers/net/dsa/qca/qca8k-8xxx.c: In function 'qca8k_phy_eth_command': drivers/net/dsa/qca/qca8k-8xxx.c:941:13: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value] 941 | u32 write_val, clear_val = 0, val; | ^~~~~~~~~ 'qca8k_phy_eth_command': event 1 | | 941 | u32 write_val, clear_val = 0, val; | | ^~~~~~~~~ | | | | | (1) use of uninitialized value '<unknown>' here | drivers/net/dsa/qca/qca8k-8xxx.c:941:39: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value] 941 | u32 write_val, clear_val = 0, val; | ^~~ 'qca8k_phy_eth_command': event 1 | | 941 | u32 write_val, clear_val = 0, val; | | ^~~ | | | | | (1) use of uninitialized value '<unknown>' here | drivers/net/dsa/qca/qca8k-8xxx.c: In function 'qca8k_mdio_busy_wait': drivers/net/dsa/qca/qca8k-8xxx.c:1114:13: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value] 1114 | u32 val; | ^~~ 'qca8k_mdio_busy_wait': event 1 | | 1114 | u32 val; | | ^~~ | | | | | (1) use of uninitialized value '<unknown>' here | drivers/net/dsa/qca/qca8k-8xxx.c: In function 'qca8k_setup_mdio_bus': drivers/net/dsa/qca/qca8k-8xxx.c:1302:61: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value] 1302 | u32 internal_mdio_mask = 0, external_mdio_mask = 0, reg; | ^~~ 'qca8k_setup_mdio_bus': event 1 | | 1302 | u32 internal_mdio_mask = 0, external_mdio_mask = 0, reg; | | ^~~ | | | | | (1) use of uninitialized value '<unknown>' here | drivers/net/dsa/qca/qca8k-8xxx.c:1304:25: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value] 1304 | phy_interface_t mode; | ^~~~ vim +526 drivers/net/dsa/qca/qca8k-8xxx.c 6b93fb46480a9c drivers/net/dsa/qca8k.c John Crispin 2016-09-15 522 6b93fb46480a9c drivers/net/dsa/qca8k.c John Crispin 2016-09-15 523 static int 6b93fb46480a9c drivers/net/dsa/qca8k.c John Crispin 2016-09-15 524 qca8k_busy_wait(struct qca8k_priv *priv, u32 reg, u32 mask) 6b93fb46480a9c drivers/net/dsa/qca8k.c John Crispin 2016-09-15 525 { 2ad255f2faaffb drivers/net/dsa/qca8k.c Christian Marangi 2021-05-14 @526 u32 val; 6b93fb46480a9c drivers/net/dsa/qca8k.c John Crispin 2016-09-15 527 8b5f3f29a81a71 drivers/net/dsa/qca8k.c Christian Marangi 2021-11-22 528 return regmap_read_poll_timeout(priv->regmap, reg, val, !(val & mask), 0, 8b5f3f29a81a71 drivers/net/dsa/qca8k.c Christian Marangi 2021-11-22 529 QCA8K_BUSY_WAIT_TIMEOUT * USEC_PER_MSEC); 6b93fb46480a9c drivers/net/dsa/qca8k.c John Crispin 2016-09-15 530 } 6b93fb46480a9c drivers/net/dsa/qca8k.c John Crispin 2016-09-15 531 :::::: The code at line 526 was first introduced by commit :::::: 2ad255f2faaffb3af786031fba2e7955454b558a net: dsa: qca8k: use iopoll macro for qca8k_busy_wait :::::: TO: Ansuel Smith <ansuelsmth(a)gmail.com&gt; :::::: CC: David S. Miller <davem(a)davemloft.net&gt; -- 0-DAY CI Kernel Test Service https://01.org/lkp