Re: [PATCH] iio: imu: kmx61: Use guard(mutex)() family over manual locking

kernel test robot
2026-05-05T04:38:48Z

Hi Maxwell,

kernel test robot noticed the following build errors:

[auto build test ERROR on jic23-iio/togreg]
[also build test ERROR on linus/master v7.1-rc2 next-20260430]
[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#_base_tree_information]

url: https://github.com/intel-lab-lkp/linux/commits/Maxwell-Doose/iio-imu-kmx61-Use-guard-mutex-family-over-manual-locking/20260504-212159
base: https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg
patch link: https://lore.kernel.org/r/20260502032455.76107-1-m32285159%40gmail.com
patch subject: [PATCH] iio: imu: kmx61: Use guard(mutex)() family over manual locking
config: hexagon-allmodconfig (https://download.01.org/0day-ci/archive/20260505/202605051218.kuLCMDTO-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260505/202605051218.kuLCMDTO-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202605051218.kuLCMDTO-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/iio/imu/kmx61.c:830:2: error: cannot jump from switch statement to this case label
830 | case IIO_CHAN_INFO_SAMP_FREQ:
| ^
drivers/iio/imu/kmx61.c:798:3: note: jump bypasses initialization of variable with __attribute__((cleanup))
798 | guard(mutex)(&data->lock);
| ^
include/linux/cleanup.h:419:2: note: expanded from macro 'guard'
419 | CLASS(_name, __UNIQUE_ID(guard))
| ^
include/linux/cleanup.h:300:3: note: expanded from macro 'CLASS'
300 | class_##_name##_constructor
| ^
<scratch space>:9:1: note: expanded from here
9 | class_mutex_constructor
| ^
note: (skipping 3 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/compiler_types.h:16:23: note: expanded from macro '__PASTE'
16 | #define __PASTE(a, b) ___PASTE(a, b)
| ^
include/linux/compiler_types.h:15:24: note: expanded from macro '___PASTE'
15 | #define ___PASTE(a, b) a##b
| ^
<scratch space>:15:1: note: expanded from here
15 | __UNIQUE_ID_unlock_468
| ^
drivers/iio/imu/kmx61.c:798:3: note: jump bypasses initialization of variable with __attribute__((cleanup))
include/linux/cleanup.h:419:15: note: expanded from macro 'guard'
419 | CLASS(_name, __UNIQUE_ID(guard))
| ^
include/linux/compiler.h:168:2: note: expanded from macro '__UNIQUE_ID'
168 | __PASTE(__UNIQUE_ID_, \
| ^
include/linux/compiler_types.h:16:23: note: expanded from macro '__PASTE'
16 | #define __PASTE(a, b) ___PASTE(a, b)
| ^
include/linux/compiler_types.h:15:24: note: expanded from macro '___PASTE'
15 | #define ___PASTE(a, b) a##b
| ^
<scratch space>:3:1: note: expanded from here
3 | __UNIQUE_ID_guard_467
| ^
drivers/iio/imu/kmx61.c:816:2: error: cannot jump from switch statement to this case label
816 | case IIO_CHAN_INFO_SCALE:
| ^
drivers/iio/imu/kmx61.c:798:3: note: jump bypasses initialization of variable with __attribute__((cleanup))
798 | guard(mutex)(&data->lock);
| ^
include/linux/cleanup.h:419:2: note: expanded from macro 'guard'
419 | CLASS(_name, __UNIQUE_ID(guard))
| ^
include/linux/cleanup.h:300:3: note: expanded from macro 'CLASS'
300 | class_##_name##_constructor
| ^
<scratch space>:9:1: note: expanded from here
9 | class_mutex_constructor
| ^
note: (skipping 3 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/compiler_types.h:16:23: note: expanded from macro '__PASTE'
16 | #define __PASTE(a, b) ___PASTE(a, b)
| ^
include/linux/compiler_types.h:15:24: note: expanded from macro '___PASTE'
15 | #define ___PASTE(a, b) a##b
| ^
<scratch space>:15:1: note: expanded from here
15 | __UNIQUE_ID_unlock_468
| ^
drivers/iio/imu/kmx61.c:798:3: note: jump bypasses initialization of variable with __attribute__((cleanup))
include/linux/cleanup.h:419:15: note: expanded from macro 'guard'
419 | CLASS(_name, __UNIQUE_ID(guard))
| ^
include/linux/compiler.h:168:2: note: expanded from macro '__UNIQUE_ID'
168 | __PASTE(__UNIQUE_ID_, \
| ^
include/linux/compiler_types.h:16:23: note: expanded from macro '__PASTE'
16 | #define __PASTE(a, b) ___PASTE(a, b)
| ^
include/linux/compiler_types.h:15:24: note: expanded from macro '___PASTE'
15 | #define ___PASTE(a, b) a##b
| ^
<scratch space>:3:1: note: expanded from here
3 | __UNIQUE_ID_guard_467
| ^
drivers/iio/imu/kmx61.c:847:6: warning: unused variable 'ret' [-Wunused-variable]
847 | int ret;
| ^~~
drivers/iio/imu/kmx61.c:864:3: error: cannot jump from switch statement to this case label
864 | default:
| ^
drivers/iio/imu/kmx61.c:862:4: note: jump bypasses initialization of variable with __attribute__((cleanup))
862 | guard(mutex)(&data->lock);
| ^
include/linux/cleanup.h:419:2: note: expanded from macro 'guard'
419 | CLASS(_name, __UNIQUE_ID(guard))
| ^
include/linux/cleanup.h:300:3: note: expanded from macro 'CLASS'
300 | class_##_name##_constructor
| ^
<scratch space>:67:1: note: expanded from here
67 | class_mutex_constructor
| ^
note: (skipping 3 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)

vim +830 drivers/iio/imu/kmx61.c

20ffac278ebd64 Daniel Baluta 2014-12-03 777
20ffac278ebd64 Daniel Baluta 2014-12-03 778 static int kmx61_read_raw(struct iio_dev *indio_dev,
20ffac278ebd64 Daniel Baluta 2014-12-03 779 struct iio_chan_spec const *chan, int *val,
20ffac278ebd64 Daniel Baluta 2014-12-03 780 int *val2, long mask)
20ffac278ebd64 Daniel Baluta 2014-12-03 781 {
20ffac278ebd64 Daniel Baluta 2014-12-03 782 int ret;
20ffac278ebd64 Daniel Baluta 2014-12-03 783 u8 base_reg;
20ffac278ebd64 Daniel Baluta 2014-12-03 784 struct kmx61_data *data = kmx61_get_data(indio_dev);
20ffac278ebd64 Daniel Baluta 2014-12-03 785
20ffac278ebd64 Daniel Baluta 2014-12-03 786 switch (mask) {
20ffac278ebd64 Daniel Baluta 2014-12-03 787 case IIO_CHAN_INFO_RAW:
20ffac278ebd64 Daniel Baluta 2014-12-03 788 switch (chan->type) {
20ffac278ebd64 Daniel Baluta 2014-12-03 789 case IIO_ACCEL:
20ffac278ebd64 Daniel Baluta 2014-12-03 790 base_reg = KMX61_ACC_XOUT_L;
20ffac278ebd64 Daniel Baluta 2014-12-03 791 break;
20ffac278ebd64 Daniel Baluta 2014-12-03 792 case IIO_MAGN:
20ffac278ebd64 Daniel Baluta 2014-12-03 793 base_reg = KMX61_MAG_XOUT_L;
20ffac278ebd64 Daniel Baluta 2014-12-03 794 break;
20ffac278ebd64 Daniel Baluta 2014-12-03 795 default:
20ffac278ebd64 Daniel Baluta 2014-12-03 796 return -EINVAL;
20ffac278ebd64 Daniel Baluta 2014-12-03 797 }
84cb5906c7fb44 Maxwell Doose 2026-05-01 798 guard(mutex)(&data->lock);
20ffac278ebd64 Daniel Baluta 2014-12-03 799
a3da4fa301ae60 Daniel Baluta 2014-12-23 800 ret = kmx61_set_power_state(data, true, chan->address);
84cb5906c7fb44 Maxwell Doose 2026-05-01 801 if (ret)
a3da4fa301ae60 Daniel Baluta 2014-12-23 802 return ret;
a3da4fa301ae60 Daniel Baluta 2014-12-23 803
20ffac278ebd64 Daniel Baluta 2014-12-03 804 ret = kmx61_read_measurement(data, base_reg, chan->scan_index);
20ffac278ebd64 Daniel Baluta 2014-12-03 805 if (ret < 0) {
aff8609addd00e Daniel Baluta 2014-12-03 806 kmx61_set_power_state(data, false, chan->address);
20ffac278ebd64 Daniel Baluta 2014-12-03 807 return ret;
20ffac278ebd64 Daniel Baluta 2014-12-03 808 }
20ffac278ebd64 Daniel Baluta 2014-12-03 809 *val = sign_extend32(ret >> chan->scan_type.shift,
20ffac278ebd64 Daniel Baluta 2014-12-03 810 chan->scan_type.realbits - 1);
a3da4fa301ae60 Daniel Baluta 2014-12-23 811 ret = kmx61_set_power_state(data, false, chan->address);
20ffac278ebd64 Daniel Baluta 2014-12-03 812
a3da4fa301ae60 Daniel Baluta 2014-12-23 813 if (ret)
a3da4fa301ae60 Daniel Baluta 2014-12-23 814 return ret;
20ffac278ebd64 Daniel Baluta 2014-12-03 815 return IIO_VAL_INT;
20ffac278ebd64 Daniel Baluta 2014-12-03 816 case IIO_CHAN_INFO_SCALE:
20ffac278ebd64 Daniel Baluta 2014-12-03 817 switch (chan->type) {
20ffac278ebd64 Daniel Baluta 2014-12-03 818 case IIO_ACCEL:
20ffac278ebd64 Daniel Baluta 2014-12-03 819 *val = 0;
20ffac278ebd64 Daniel Baluta 2014-12-03 820 *val2 = kmx61_uscale_table[data->range];
20ffac278ebd64 Daniel Baluta 2014-12-03 821 return IIO_VAL_INT_PLUS_MICRO;
20ffac278ebd64 Daniel Baluta 2014-12-03 822 case IIO_MAGN:
20ffac278ebd64 Daniel Baluta 2014-12-03 823 /* 14 bits res, 1465 microGauss per magn count */
20ffac278ebd64 Daniel Baluta 2014-12-03 824 *val = 0;
20ffac278ebd64 Daniel Baluta 2014-12-03 825 *val2 = 1465;
20ffac278ebd64 Daniel Baluta 2014-12-03 826 return IIO_VAL_INT_PLUS_MICRO;
20ffac278ebd64 Daniel Baluta 2014-12-03 827 default:
20ffac278ebd64 Daniel Baluta 2014-12-03 828 return -EINVAL;
20ffac278ebd64 Daniel Baluta 2014-12-03 829 }
20ffac278ebd64 Daniel Baluta 2014-12-03 @830 case IIO_CHAN_INFO_SAMP_FREQ:
20ffac278ebd64 Daniel Baluta 2014-12-03 831 if (chan->type != IIO_ACCEL && chan->type != IIO_MAGN)
20ffac278ebd64 Daniel Baluta 2014-12-03 832 return -EINVAL;
20ffac278ebd64 Daniel Baluta 2014-12-03 833
84cb5906c7fb44 Maxwell Doose 2026-05-01 834 scoped_guard(mutex, &data->lock)
20ffac278ebd64 Daniel Baluta 2014-12-03 835 ret = kmx61_get_odr(data, val, val2, chan->address);
20ffac278ebd64 Daniel Baluta 2014-12-03 836 if (ret)
20ffac278ebd64 Daniel Baluta 2014-12-03 837 return -EINVAL;
20ffac278ebd64 Daniel Baluta 2014-12-03 838 return IIO_VAL_INT_PLUS_MICRO;
20ffac278ebd64 Daniel Baluta 2014-12-03 839 }
20ffac278ebd64 Daniel Baluta 2014-12-03 840 return -EINVAL;
20ffac278ebd64 Daniel Baluta 2014-12-03 841 }
20ffac278ebd64 Daniel Baluta 2014-12-03 842

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