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Date: Fri, 12 May 2023 08:16:02 +0300
From: Matti Vaittinen <mazziesaccount@...il.com>
To: Dan Carpenter <dan.carpenter@...aro.org>,
oe-kbuild@...ts.linux.dev,
Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
Cc: lkp@...el.com, oe-kbuild-all@...ts.linux.dev,
linux-kernel@...r.kernel.org,
Jonathan Cameron <Jonathan.Cameron@...wei.com>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: drivers/iio/accel/kionix-kx022a.c:1053 kx022a_probe_internal()
warn: passing zero to 'dev_err_probe'
On 5/11/23 13:48, Dan Carpenter wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head: ad2fd53a7870a395b8564697bef6c329d017c6c9
> commit: 7c1d1677b3227c6b18ac999f2b84778baa280b8f iio: accel: Support Kionix/ROHM KX022A accelerometer
> config: openrisc-randconfig-m041-20230509 (https://download.01.org/0day-ci/archive/20230511/202305110245.MFxC9bUj-lkp@intel.com/config)
> compiler: or1k-linux-gcc (GCC) 12.1.0
>
> If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <lkp@...el.com>
> | Reported-by: Dan Carpenter <error27@...il.com>
> | Link: https://lore.kernel.org/r/202305110245.MFxC9bUj-lkp@intel.com/
>
> smatch warnings:
> drivers/iio/accel/kionix-kx022a.c:1053 kx022a_probe_internal() warn: passing zero to 'dev_err_probe'
>
> vim +/dev_err_probe +1053 drivers/iio/accel/kionix-kx022a.c
>
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1000 int kx022a_probe_internal(struct device *dev)
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1001 {
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1002 static const char * const regulator_names[] = {"io-vdd", "vdd"};
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1003 struct iio_trigger *indio_trig;
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1004 struct fwnode_handle *fwnode;
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1005 struct kx022a_data *data;
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1006 struct regmap *regmap;
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1007 unsigned int chip_id;
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1008 struct iio_dev *idev;
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1009 int ret, irq;
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1010 char *name;
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1011
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1012 regmap = dev_get_regmap(dev, NULL);
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1013 if (!regmap) {
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1014 dev_err(dev, "no regmap\n");
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1015 return -EINVAL;
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1016 }
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1017
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1018 fwnode = dev_fwnode(dev);
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1019 if (!fwnode)
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1020 return -ENODEV;
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1021
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1022 idev = devm_iio_device_alloc(dev, sizeof(*data));
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1023 if (!idev)
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1024 return -ENOMEM;
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1025
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1026 data = iio_priv(idev);
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1027
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1028 /*
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1029 * VDD is the analog and digital domain voltage supply and
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1030 * IO_VDD is the digital I/O voltage supply.
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1031 */
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1032 ret = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(regulator_names),
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1033 regulator_names);
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1034 if (ret && ret != -ENODEV)
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1035 return dev_err_probe(dev, ret, "failed to enable regulator\n");
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1036
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1037 ret = regmap_read(regmap, KX022A_REG_WHO, &chip_id);
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1038 if (ret)
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1039 return dev_err_probe(dev, ret, "Failed to access sensor\n");
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1040
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1041 if (chip_id != KX022A_ID) {
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1042 dev_err(dev, "unsupported device 0x%x\n", chip_id);
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1043 return -EINVAL;
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1044 }
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1045
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1046 irq = fwnode_irq_get_byname(fwnode, "INT1");
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1047 if (irq > 0) {
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1048 data->inc_reg = KX022A_REG_INC1;
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1049 data->ien_reg = KX022A_REG_INC4;
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1050 } else {
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1051 irq = fwnode_irq_get_byname(fwnode, "INT2");
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 1052 if (irq <= 0)
> ^^^^^^^^
> This code assumes fwnode_irq_get_byname() can return zero.
>
> 7c1d1677b3227c Matti Vaittinen 2022-10-24 @1053 return dev_err_probe(dev, irq, "No suitable IRQ\n");
>
> But fortunately, it can't otherwise this would return success.
>
Ouch. Actually, the fwnode_irq_get_byname() can return zero on
device-tree mapping error. I did actually send a patch to address this
some time ago:
https://lore.kernel.org/lkml/cover.1666710197.git.mazziesaccount@gmail.com/
but got stuck on not knowing "the right way" of handling an smbus
use-case. Later I forgot this.
It seems I did describe this very same error in the cover-letter - and
right after that I fell on this very trap I described... :/
Thanks for the heads-up Dan!
Yours,
-- Matti
--
Matti Vaittinen
Linux kernel developer at ROHM Semiconductors
Oulu Finland
~~ When things go utterly wrong vim users can always type :help! ~~
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