Re: [PATCH v5] staging: Use buf_lock instead of mlock and Refactor code

From: kbuild test robot
Date: Tue Mar 21 2017 - 10:32:36 EST

Hi simran,

[auto build test WARNING on iio/togreg]
[also build test WARNING on v4.11-rc3 next-20170321]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/simran-singhal/staging-Use-buf_lock-instead-of-mlock-and-Refactor-code/20170321-213956
base: https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg
config: x86_64-randconfig-x016-201712 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64

All warnings (new ones prefixed by >>):

In file included from include/uapi/linux/stddef.h:1:0,
from include/linux/stddef.h:4,
from include/uapi/linux/posix_types.h:4,
from include/uapi/linux/types.h:13,
from include/linux/types.h:5,
from include/linux/list.h:4,
from include/linux/module.h:9,
from drivers/staging/iio/gyro/adis16060_core.c:9:
drivers/staging/iio/gyro/adis16060_core.c: In function 'adis16060_read_raw':
include/linux/compiler.h:149:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
if (__builtin_constant_p(!!(cond)) ? !!(cond) : \
^
include/linux/compiler.h:147:23: note: in expansion of macro '__trace_if'
#define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
^~~~~~~~~~
>> drivers/staging/iio/gyro/adis16060_core.c:89:3: note: in expansion of macro 'if'
if (ret < 0)
^~
drivers/staging/iio/gyro/adis16060_core.c:91:4: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
return ret;
^~~~~~

vim +/if +89 drivers/staging/iio/gyro/adis16060_core.c

e071f6b8 Barry Song 2010-10-27 3 *
e071f6b8 Barry Song 2010-10-27 4 * Copyright 2010 Analog Devices Inc.
e071f6b8 Barry Song 2010-10-27 5 *
e071f6b8 Barry Song 2010-10-27 6 * Licensed under the GPL-2 or later.
e071f6b8 Barry Song 2010-10-27 7 */
e071f6b8 Barry Song 2010-10-27 8
45296236 Paul Gortmaker 2011-08-30 @9 #include <linux/module.h>
e071f6b8 Barry Song 2010-10-27 10 #include <linux/delay.h>
e071f6b8 Barry Song 2010-10-27 11 #include <linux/mutex.h>
e071f6b8 Barry Song 2010-10-27 12 #include <linux/device.h>
e071f6b8 Barry Song 2010-10-27 13 #include <linux/kernel.h>
e071f6b8 Barry Song 2010-10-27 14 #include <linux/spi/spi.h>
e071f6b8 Barry Song 2010-10-27 15 #include <linux/slab.h>
e071f6b8 Barry Song 2010-10-27 16 #include <linux/sysfs.h>
14f98326 Jonathan Cameron 2011-02-28 17
06458e27 Jonathan Cameron 2012-04-25 18 #include <linux/iio/iio.h>
06458e27 Jonathan Cameron 2012-04-25 19 #include <linux/iio/sysfs.h>
e071f6b8 Barry Song 2010-10-27 20
14f98326 Jonathan Cameron 2011-02-28 21 #define ADIS16060_GYRO 0x20 /* Measure Angular Rate (Gyro) */
14f98326 Jonathan Cameron 2011-02-28 22 #define ADIS16060_TEMP_OUT 0x10 /* Measure Temperature */
14f98326 Jonathan Cameron 2011-02-28 23 #define ADIS16060_AIN2 0x80 /* Measure AIN2 */
14f98326 Jonathan Cameron 2011-02-28 24 #define ADIS16060_AIN1 0x40 /* Measure AIN1 */
14f98326 Jonathan Cameron 2011-02-28 25
14f98326 Jonathan Cameron 2011-02-28 26 /**
14f98326 Jonathan Cameron 2011-02-28 27 * struct adis16060_state - device instance specific data
14f98326 Jonathan Cameron 2011-02-28 28 * @us_w: actual spi_device to write config
14f98326 Jonathan Cameron 2011-02-28 29 * @us_r: actual spi_device to read back data
25985edc Lucas De Marchi 2011-03-30 30 * @buf: transmit or receive buffer
14f98326 Jonathan Cameron 2011-02-28 31 * @buf_lock: mutex to protect tx and rx
14f98326 Jonathan Cameron 2011-02-28 32 **/
14f98326 Jonathan Cameron 2011-02-28 33 struct adis16060_state {
14f98326 Jonathan Cameron 2011-02-28 34 struct spi_device *us_w;
14f98326 Jonathan Cameron 2011-02-28 35 struct spi_device *us_r;
14f98326 Jonathan Cameron 2011-02-28 36 struct mutex buf_lock;
14f98326 Jonathan Cameron 2011-02-28 37
14f98326 Jonathan Cameron 2011-02-28 38 u8 buf[3] ____cacheline_aligned;
14f98326 Jonathan Cameron 2011-02-28 39 };
e071f6b8 Barry Song 2010-10-27 40
3a5952f9 Jonathan Cameron 2011-06-27 41 static struct iio_dev *adis16060_iio_dev;
e071f6b8 Barry Song 2010-10-27 42
71db16e5 simran singhal 2017-03-19 43 static int adis16060_spi_write_than_read(struct iio_dev *indio_dev,
71db16e5 simran singhal 2017-03-19 44 u8 conf, u16 *val)
e071f6b8 Barry Song 2010-10-27 45 {
e071f6b8 Barry Song 2010-10-27 46 int ret;
3a5952f9 Jonathan Cameron 2011-06-27 47 struct adis16060_state *st = iio_priv(indio_dev);
e071f6b8 Barry Song 2010-10-27 48
e071f6b8 Barry Song 2010-10-27 49 mutex_lock(&st->buf_lock);
71db16e5 simran singhal 2017-03-19 50 st->buf[2] = conf; /* The last 8 bits clocked in are latched */
14f98326 Jonathan Cameron 2011-02-28 51 ret = spi_write(st->us_w, st->buf, 3);
e071f6b8 Barry Song 2010-10-27 52
71db16e5 simran singhal 2017-03-19 53 if (ret < 0) {
71db16e5 simran singhal 2017-03-19 54 mutex_unlock(&st->buf_lock);
e071f6b8 Barry Song 2010-10-27 55 return ret;
e071f6b8 Barry Song 2010-10-27 56 }
e071f6b8 Barry Song 2010-10-27 57
14f98326 Jonathan Cameron 2011-02-28 58 ret = spi_read(st->us_r, st->buf, 3);
e071f6b8 Barry Song 2010-10-27 59
d14ae859 Jonathan Cameron 2011-02-11 60 /* The internal successive approximation ADC begins the
d14ae859 Jonathan Cameron 2011-02-11 61 * conversion process on the falling edge of MSEL1 and
d14ae859 Jonathan Cameron 2011-02-11 62 * starts to place data MSB first on the DOUT line at
d14ae859 Jonathan Cameron 2011-02-11 63 * the 6th falling edge of SCLK
e071f6b8 Barry Song 2010-10-27 64 */
05824120 Cristina Moraru 2015-10-20 65 if (!ret)
14f98326 Jonathan Cameron 2011-02-28 66 *val = ((st->buf[0] & 0x3) << 12) |
14f98326 Jonathan Cameron 2011-02-28 67 (st->buf[1] << 4) |
14f98326 Jonathan Cameron 2011-02-28 68 ((st->buf[2] >> 4) & 0xF);
e071f6b8 Barry Song 2010-10-27 69 mutex_unlock(&st->buf_lock);
e071f6b8 Barry Song 2010-10-27 70
e071f6b8 Barry Song 2010-10-27 71 return ret;
e071f6b8 Barry Song 2010-10-27 72 }
e071f6b8 Barry Song 2010-10-27 73
4f2ca080 Jonathan Cameron 2011-08-12 74 static int adis16060_read_raw(struct iio_dev *indio_dev,
4f2ca080 Jonathan Cameron 2011-08-12 75 struct iio_chan_spec const *chan,
4f2ca080 Jonathan Cameron 2011-08-12 76 int *val, int *val2,
4f2ca080 Jonathan Cameron 2011-08-12 77 long mask)
e071f6b8 Barry Song 2010-10-27 78 {
4f2ca080 Jonathan Cameron 2011-08-12 79 u16 tval = 0;
4f2ca080 Jonathan Cameron 2011-08-12 80 int ret;
71db16e5 simran singhal 2017-03-19 81 struct adis16060_state *st = iio_priv(indio_dev);
e071f6b8 Barry Song 2010-10-27 82
4f2ca080 Jonathan Cameron 2011-08-12 83 switch (mask) {
fbaff213 Jonathan Cameron 2012-04-15 84 case IIO_CHAN_INFO_RAW:
e071f6b8 Barry Song 2010-10-27 85 /* Take the iio_dev status lock */
71db16e5 simran singhal 2017-03-19 86 mutex_lock(&st->buf_lock);
71db16e5 simran singhal 2017-03-19 87 ret = adis16060_spi_write_than_read(indio_dev,
71db16e5 simran singhal 2017-03-19 88 chan->address, &tval);
31a99443 Cristina Moraru 2015-10-25 @89 if (ret < 0)
71db16e5 simran singhal 2017-03-19 90 mutex_unlock(&st->buf_lock);
71db16e5 simran singhal 2017-03-19 91 return ret;
31a99443 Cristina Moraru 2015-10-25 92

:::::: The code at line 89 was first introduced by commit
:::::: 31a99443a53aa65cdaaaaa3bcd5ed685eec87419 staging: iio: adis16060_core: Fix error handling

:::::: TO: Cristina Moraru <cristina.moraru09@xxxxxxxxx>
:::::: CC: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

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