Re: [PATCH 2/3] iio: adc: ad7380: use if_not_cond_guard for claim direct

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Hi David,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 431c39f6d3edbab14f48dbf37a58ccdc0ac3be1e]

url:    https://github.com/intel-lab-lkp/linux/commits/David-Lechner/cleanup-add-conditional-guard-helper/20241002-063209
base:   431c39f6d3edbab14f48dbf37a58ccdc0ac3be1e
patch link:    https://lore.kernel.org/r/20241001-cleanup-if_not_cond_guard-v1-2-7753810b0f7a%40baylibre.com
patch subject: [PATCH 2/3] iio: adc: ad7380: use if_not_cond_guard for claim direct
config: x86_64-randconfig-011-20241003 (https://download.01.org/0day-ci/archive/20241003/202410031215.IKHRIsat-lkp@xxxxxxxxx/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241003/202410031215.IKHRIsat-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410031215.IKHRIsat-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> drivers/iio/adc/ad7380.c:823:3: warning: label followed by a declaration is a C23 extension [-Wc23-extensions]
     823 |                 if_not_cond_guard(iio_claim_direct_try, indio_dev)
         |                 ^
   include/linux/cleanup.h:316:2: note: expanded from macro 'if_not_cond_guard'
     316 |         __if_not_cond_guard(_name, __UNIQUE_ID(guard), args)
         |         ^
   include/linux/cleanup.h:312:2: note: expanded from macro '__if_not_cond_guard'
     312 |         CLASS(_name, _id)(args);                        \
         |         ^
   include/linux/cleanup.h:258:2: note: expanded from macro 'CLASS'
     258 |         class_##_name##_t var __cleanup(class_##_name##_destructor) =   \
         |         ^
   <scratch space>:67:1: note: expanded from here
      67 | class_iio_claim_direct_try_t
         | ^
   drivers/iio/adc/ad7380.c:851:2: error: cannot jump from switch statement to this case label
     851 |         default:
         |         ^
   drivers/iio/adc/ad7380.c:823:3: note: jump bypasses initialization of variable with __attribute__((cleanup))
     823 |                 if_not_cond_guard(iio_claim_direct_try, indio_dev)
         |                 ^
   include/linux/cleanup.h:316:29: note: expanded from macro 'if_not_cond_guard'
     316 |         __if_not_cond_guard(_name, __UNIQUE_ID(guard), args)
         |                                    ^
   include/linux/compiler.h:189:29: note: expanded from macro '__UNIQUE_ID'
     189 | #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
         |                             ^
   include/linux/compiler_types.h:84:22: note: expanded from macro '__PASTE'
      84 | #define __PASTE(a,b) ___PASTE(a,b)
         |                      ^
   include/linux/compiler_types.h:83:23: note: expanded from macro '___PASTE'
      83 | #define ___PASTE(a,b) a##b
         |                       ^
   <scratch space>:65:1: note: expanded from here
      65 | __UNIQUE_ID_guard837
         | ^
   drivers/iio/adc/ad7380.c:847:2: error: cannot jump from switch statement to this case label
     847 |         case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
         |         ^
   drivers/iio/adc/ad7380.c:823:3: note: jump bypasses initialization of variable with __attribute__((cleanup))
     823 |                 if_not_cond_guard(iio_claim_direct_try, indio_dev)
         |                 ^
   include/linux/cleanup.h:316:29: note: expanded from macro 'if_not_cond_guard'
     316 |         __if_not_cond_guard(_name, __UNIQUE_ID(guard), args)
         |                                    ^
   include/linux/compiler.h:189:29: note: expanded from macro '__UNIQUE_ID'
     189 | #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
         |                             ^
   include/linux/compiler_types.h:84:22: note: expanded from macro '__PASTE'
      84 | #define __PASTE(a,b) ___PASTE(a,b)
         |                      ^
   include/linux/compiler_types.h:83:23: note: expanded from macro '___PASTE'
      83 | #define ___PASTE(a,b) a##b
         |                       ^
   <scratch space>:65:1: note: expanded from here
      65 | __UNIQUE_ID_guard837
         | ^
   drivers/iio/adc/ad7380.c:838:2: error: cannot jump from switch statement to this case label
     838 |         case IIO_CHAN_INFO_OFFSET:
         |         ^
   drivers/iio/adc/ad7380.c:823:3: note: jump bypasses initialization of variable with __attribute__((cleanup))
     823 |                 if_not_cond_guard(iio_claim_direct_try, indio_dev)
         |                 ^
   include/linux/cleanup.h:316:29: note: expanded from macro 'if_not_cond_guard'
     316 |         __if_not_cond_guard(_name, __UNIQUE_ID(guard), args)
         |                                    ^
   include/linux/compiler.h:189:29: note: expanded from macro '__UNIQUE_ID'
     189 | #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
         |                             ^
   include/linux/compiler_types.h:84:22: note: expanded from macro '__PASTE'
      84 | #define __PASTE(a,b) ___PASTE(a,b)
         |                      ^
   include/linux/compiler_types.h:83:23: note: expanded from macro '___PASTE'
      83 | #define ___PASTE(a,b) a##b
         |                       ^
   <scratch space>:65:1: note: expanded from here
      65 | __UNIQUE_ID_guard837
         | ^
   drivers/iio/adc/ad7380.c:827:2: error: cannot jump from switch statement to this case label
     827 |         case IIO_CHAN_INFO_SCALE:
         |         ^
   drivers/iio/adc/ad7380.c:823:3: note: jump bypasses initialization of variable with __attribute__((cleanup))
     823 |                 if_not_cond_guard(iio_claim_direct_try, indio_dev)
         |                 ^
   include/linux/cleanup.h:316:29: note: expanded from macro 'if_not_cond_guard'
     316 |         __if_not_cond_guard(_name, __UNIQUE_ID(guard), args)
         |                                    ^
   include/linux/compiler.h:189:29: note: expanded from macro '__UNIQUE_ID'
     189 | #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
         |                             ^
   include/linux/compiler_types.h:84:22: note: expanded from macro '__PASTE'
      84 | #define __PASTE(a,b) ___PASTE(a,b)
         |                      ^
   include/linux/compiler_types.h:83:23: note: expanded from macro '___PASTE'
      83 | #define ___PASTE(a,b) a##b
         |                       ^
   <scratch space>:65:1: note: expanded from here
      65 | __UNIQUE_ID_guard837
         | ^
   drivers/iio/adc/ad7380.c:935:2: error: cannot jump from switch statement to this case label
     935 |         default:


vim +823 drivers/iio/adc/ad7380.c

   808	
   809	static int ad7380_read_raw(struct iio_dev *indio_dev,
   810				   struct iio_chan_spec const *chan,
   811				   int *val, int *val2, long info)
   812	{
   813		struct ad7380_state *st = iio_priv(indio_dev);
   814		const struct iio_scan_type *scan_type;
   815	
   816		scan_type = iio_get_current_scan_type(indio_dev, chan);
   817	
   818		if (IS_ERR(scan_type))
   819			return PTR_ERR(scan_type);
   820	
   821		switch (info) {
   822		case IIO_CHAN_INFO_RAW:
 > 823			if_not_cond_guard(iio_claim_direct_try, indio_dev)
   824				return -EBUSY;
   825	
   826			return ad7380_read_direct(st, chan->scan_index, scan_type, val);
   827		case IIO_CHAN_INFO_SCALE:
   828			/*
   829			 * According to the datasheet, the LSB size is:
   830			 *    * (2 × VREF) / 2^N, for differential chips
   831			 *    * VREF / 2^N, for pseudo-differential chips
   832			 * where N is the ADC resolution (i.e realbits)
   833			 */
   834			*val = st->vref_mv;
   835			*val2 = scan_type->realbits - chan->differential;
   836	
   837			return IIO_VAL_FRACTIONAL_LOG2;
   838		case IIO_CHAN_INFO_OFFSET:
   839			/*
   840			 * According to IIO ABI, offset is applied before scale,
   841			 * so offset is: vcm_mv / scale
   842			 */
   843			*val = st->vcm_mv[chan->channel] * (1 << scan_type->realbits)
   844				/ st->vref_mv;
   845	
   846			return IIO_VAL_INT;
   847		case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
   848			*val = st->oversampling_ratio;
   849	
   850			return IIO_VAL_INT;
   851		default:
   852			return -EINVAL;
   853		}
   854	}
   855	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki




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