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SubjectRe: [PATCH v2 3/4] mb12x2.c: add distance iio sensor with i2c (fwd)
Hello,

It looks like an unlock is missing before line 110.

julia

---------- Forwarded message ----------
Date: Mon, 4 Mar 2019 03:30:02 +0800
From: kbuild test robot <lkp@intel.com>
To: kbuild@01.org
Cc: Julia Lawall <julia.lawall@lip6.fr>
Subject: Re: [PATCH v2 3/4] mb12x2.c: add distance iio sensor with i2c

Hi Andreas,

I love your patch! Perhaps something to improve:

[auto build test WARNING on iio/togreg]
[also build test WARNING on v5.0-rc8 next-20190301]
[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/Andreas-Klinger/add-MaxBotix-I2CXL-ultrasonic-iio-driver/20190304-001520
base: https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg
:::::: branch date: 3 hours ago
:::::: commit date: 3 hours ago

>> drivers/iio/proximity/mb12x2.c:110:2-8: preceding lock on line 70

# https://github.com/0day-ci/linux/commit/a931c13b9c38d77e8dbf0b8aa64288a4bfcc789c
git remote add linux-review https://github.com/0day-ci/linux
git remote update linux-review
git checkout a931c13b9c38d77e8dbf0b8aa64288a4bfcc789c
vim +110 drivers/iio/proximity/mb12x2.c

a931c13b Andreas Klinger 2019-03-01 62
a931c13b Andreas Klinger 2019-03-01 63 static s16 mb12x2_read_distance(struct mb12x2_data *data)
a931c13b Andreas Klinger 2019-03-01 64 {
a931c13b Andreas Klinger 2019-03-01 65 struct i2c_client *client = data->client;
a931c13b Andreas Klinger 2019-03-01 66 int ret;
a931c13b Andreas Klinger 2019-03-01 67 s16 distance;
a931c13b Andreas Klinger 2019-03-01 68 __be16 buf;
a931c13b Andreas Klinger 2019-03-01 69
a931c13b Andreas Klinger 2019-03-01 @70 mutex_lock(&data->lock);
a931c13b Andreas Klinger 2019-03-01 71
a931c13b Andreas Klinger 2019-03-01 72 reinit_completion(&data->ranging);
a931c13b Andreas Klinger 2019-03-01 73
a931c13b Andreas Klinger 2019-03-01 74 ret = i2c_smbus_write_byte(client, MB12X2_RANGE_COMMAND);
a931c13b Andreas Klinger 2019-03-01 75 if (ret < 0) {
a931c13b Andreas Klinger 2019-03-01 76 dev_err(&client->dev, "write command - err: %d\n", ret);
a931c13b Andreas Klinger 2019-03-01 77 mutex_unlock(&data->lock);
a931c13b Andreas Klinger 2019-03-01 78 return ret;
a931c13b Andreas Klinger 2019-03-01 79 }
a931c13b Andreas Klinger 2019-03-01 80
a931c13b Andreas Klinger 2019-03-01 81 if (data->gpiod_status) {
a931c13b Andreas Klinger 2019-03-01 82 /* it cannot take more than 100 ms */
a931c13b Andreas Klinger 2019-03-01 83 ret = wait_for_completion_killable_timeout(&data->ranging,
a931c13b Andreas Klinger 2019-03-01 84 HZ/10);
a931c13b Andreas Klinger 2019-03-01 85 if (ret < 0) {
a931c13b Andreas Klinger 2019-03-01 86 mutex_unlock(&data->lock);
a931c13b Andreas Klinger 2019-03-01 87 return ret;
a931c13b Andreas Klinger 2019-03-01 88 } else if (ret == 0) {
a931c13b Andreas Klinger 2019-03-01 89 mutex_unlock(&data->lock);
a931c13b Andreas Klinger 2019-03-01 90 return -ETIMEDOUT;
a931c13b Andreas Klinger 2019-03-01 91 }
a931c13b Andreas Klinger 2019-03-01 92 } else {
a931c13b Andreas Klinger 2019-03-01 93 /*
a931c13b Andreas Klinger 2019-03-01 94 * use simple sleep if gpio announce pin is not connected
a931c13b Andreas Klinger 2019-03-01 95 */
a931c13b Andreas Klinger 2019-03-01 96 msleep(15);
a931c13b Andreas Klinger 2019-03-01 97 }
a931c13b Andreas Klinger 2019-03-01 98
a931c13b Andreas Klinger 2019-03-01 99 ret = i2c_master_recv(client, (char *)&buf, sizeof(buf));
a931c13b Andreas Klinger 2019-03-01 100 if (ret < 0) {
a931c13b Andreas Klinger 2019-03-01 101 dev_err(&client->dev, "i2c_master_recv: ret=%d\n", ret);
a931c13b Andreas Klinger 2019-03-01 102 mutex_unlock(&data->lock);
a931c13b Andreas Klinger 2019-03-01 103 return ret;
a931c13b Andreas Klinger 2019-03-01 104 }
a931c13b Andreas Klinger 2019-03-01 105
a931c13b Andreas Klinger 2019-03-01 106 distance = __be16_to_cpu(buf);
a931c13b Andreas Klinger 2019-03-01 107 /* check for not returning misleading error codes */
a931c13b Andreas Klinger 2019-03-01 108 if (distance < 0) {
a931c13b Andreas Klinger 2019-03-01 109 dev_err(&client->dev, "distance=%d\n", distance);
a931c13b Andreas Klinger 2019-03-01 @110 return -EINVAL;
a931c13b Andreas Klinger 2019-03-01 111 }
a931c13b Andreas Klinger 2019-03-01 112
a931c13b Andreas Klinger 2019-03-01 113 mutex_unlock(&data->lock);
a931c13b Andreas Klinger 2019-03-01 114
a931c13b Andreas Klinger 2019-03-01 115 return distance;
a931c13b Andreas Klinger 2019-03-01 116 }
a931c13b Andreas Klinger 2019-03-01 117

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