From: Guenter Roeck <linux@roeck-us.net>
To: Hardware Monitoring <linux-hwmon@vger.kernel.org>
Cc: Jean Delvare <jdelvare@suse.com>,
Guenter Roeck <linux@roeck-us.net>,
Jean-Francois Dagenais <jeff.dagenais@gmail.com>
Subject: [PATCH 03/11] hwmon: (max6650) Improve error handling in max6650_init_client
Date: Tue, 23 Apr 2019 06:33:03 -0700 [thread overview]
Message-ID: <1556026391-15360-3-git-send-email-linux@roeck-us.net> (raw)
In-Reply-To: <1556026391-15360-1-git-send-email-linux@roeck-us.net>
Do not overwrite errors reported from i2c functions, and don't ignore
any errors.
Cc: Jean-Francois Dagenais <jeff.dagenais@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
drivers/hwmon/max6650.c | 43 ++++++++++++++++++++++++-------------------
1 file changed, 24 insertions(+), 19 deletions(-)
diff --git a/drivers/hwmon/max6650.c b/drivers/hwmon/max6650.c
index b6b8f8edc1b0..ac05cc5627d7 100644
--- a/drivers/hwmon/max6650.c
+++ b/drivers/hwmon/max6650.c
@@ -618,8 +618,8 @@ static int max6650_init_client(struct max6650_data *data,
struct i2c_client *client)
{
struct device *dev = &client->dev;
- int config;
- int err = -EIO;
+ int reg;
+ int err;
u32 voltage;
u32 prescale;
u32 target_rpm;
@@ -633,21 +633,20 @@ static int max6650_init_client(struct max6650_data *data,
&prescale))
prescale = prescaler;
- config = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG);
-
- if (config < 0) {
- dev_err(dev, "Error reading config, aborting.\n");
- return err;
+ reg = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG);
+ if (reg < 0) {
+ dev_err(dev, "Error reading config register, aborting.\n");
+ return reg;
}
switch (voltage) {
case 0:
break;
case 5:
- config &= ~MAX6650_CFG_V12;
+ reg &= ~MAX6650_CFG_V12;
break;
case 12:
- config |= MAX6650_CFG_V12;
+ reg |= MAX6650_CFG_V12;
break;
default:
dev_err(dev, "illegal value for fan_voltage (%d)\n", voltage);
@@ -657,22 +656,22 @@ static int max6650_init_client(struct max6650_data *data,
case 0:
break;
case 1:
- config &= ~MAX6650_CFG_PRESCALER_MASK;
+ reg &= ~MAX6650_CFG_PRESCALER_MASK;
break;
case 2:
- config = (config & ~MAX6650_CFG_PRESCALER_MASK)
+ reg = (reg & ~MAX6650_CFG_PRESCALER_MASK)
| MAX6650_CFG_PRESCALER_2;
break;
case 4:
- config = (config & ~MAX6650_CFG_PRESCALER_MASK)
+ reg = (reg & ~MAX6650_CFG_PRESCALER_MASK)
| MAX6650_CFG_PRESCALER_4;
break;
case 8:
- config = (config & ~MAX6650_CFG_PRESCALER_MASK)
+ reg = (reg & ~MAX6650_CFG_PRESCALER_MASK)
| MAX6650_CFG_PRESCALER_8;
break;
case 16:
- config = (config & ~MAX6650_CFG_PRESCALER_MASK)
+ reg = (reg & ~MAX6650_CFG_PRESCALER_MASK)
| MAX6650_CFG_PRESCALER_16;
break;
default:
@@ -680,16 +679,22 @@ static int max6650_init_client(struct max6650_data *data,
}
dev_info(dev, "Fan voltage: %dV, prescaler: %d.\n",
- (config & MAX6650_CFG_V12) ? 12 : 5,
- 1 << (config & MAX6650_CFG_PRESCALER_MASK));
+ (reg & MAX6650_CFG_V12) ? 12 : 5,
+ 1 << (reg & MAX6650_CFG_PRESCALER_MASK));
- if (i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, config)) {
+ err = i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, reg);
+ if (err) {
dev_err(dev, "Config write error, aborting.\n");
return err;
}
- data->config = config;
- data->count = i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT);
+ data->config = reg;
+ reg = i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT);
+ if (reg < 0) {
+ dev_err(dev, "Failed to read count register, aborting.\n");
+ return reg;
+ }
+ data->count = reg;
if (!of_property_read_u32(client->dev.of_node, "maxim,fan-target-rpm",
&target_rpm)) {
--
2.7.4
next prev parent reply other threads:[~2019-04-23 13:33 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-23 13:33 [PATCH 01/11] hwmon: (max6650) Use devm_add_action to unregister thermal device Guenter Roeck
2019-04-23 13:33 ` [PATCH 02/11] hwmon: (max6650) Introduce pwm_to_dac and dac_to_pwm Guenter Roeck
2019-04-23 15:23 ` Jean-Francois Dagenais
2019-04-23 17:02 ` Guenter Roeck
2019-04-23 13:33 ` Guenter Roeck [this message]
2019-04-23 13:33 ` [PATCH 04/11] hwmon: (max6650) Declare valid as boolean Guenter Roeck
2019-04-23 13:33 ` [PATCH 05/11] hwmon: (max6650) Cache alarm_en register Guenter Roeck
2019-04-23 13:33 ` [PATCH 06/11] hwmon: (max6650) Simplify alarm handling Guenter Roeck
2019-04-23 13:33 ` [PATCH 07/11] hwmon: (max6650) Convert to use devm_hwmon_device_register_with_info Guenter Roeck
2019-04-24 13:42 ` Guenter Roeck
2019-04-23 13:33 ` [PATCH 08/11] hwmon: (max6650) Read non-volatile registers only once Guenter Roeck
2019-04-23 13:33 ` [PATCH 09/11] hwmon: (max6650) Improve error handling in max6650_update_device Guenter Roeck
2019-04-23 13:33 ` [PATCH 10/11] hwmon: (max6650) Use SPDX license identifier Guenter Roeck
2019-04-23 13:33 ` [PATCH 11/11] hwmon: (max6650) Fix minor formatting issues Guenter Roeck
2019-04-23 14:38 ` Jean-Francois Dagenais
2019-04-23 15:18 ` Guenter Roeck
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1556026391-15360-3-git-send-email-linux@roeck-us.net \
--to=linux@roeck-us.net \
--cc=jdelvare@suse.com \
--cc=jeff.dagenais@gmail.com \
--cc=linux-hwmon@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).