Re: [PATCH 6/6] i2c: Make remove callback return void
On Tue, 28 Jun 2022 16:03:12 +0200, Uwe Kleine-König wrote:
From: Uwe Kleine-König uwe@kleine-koenig.org
The value returned by an i2c driver's remove function is mostly ignored. (Only an error message is printed if the value is non-zero that the error is ignored.)
So change the prototype of the remove function to return no value. This way driver authors are not tempted to assume that passing an error to the upper layer is a good idea. All drivers are adapted accordingly. There is no intended change of behaviour, all callbacks were prepared to return 0 before.
Signed-off-by: Uwe Kleine-König u.kleine-koenig@pengutronix.de
That's a huge change for a relatively small benefit, but if this is approved by the I2C core maintainer then fine with me. For:
drivers/hwmon/adc128d818.c | 4 +--- drivers/hwmon/adt7470.c | 3 +-- drivers/hwmon/asb100.c | 6 ++---- drivers/hwmon/asc7621.c | 4 +--- drivers/hwmon/dme1737.c | 4 +--- drivers/hwmon/f75375s.c | 5 ++--- drivers/hwmon/fschmd.c | 6 ++---- drivers/hwmon/ftsteutates.c | 3 +-- drivers/hwmon/ina209.c | 4 +--- drivers/hwmon/ina3221.c | 4 +--- drivers/hwmon/jc42.c | 3 +-- drivers/hwmon/mcp3021.c | 4 +--- drivers/hwmon/occ/p8_i2c.c | 4 +--- drivers/hwmon/pcf8591.c | 3 +-- drivers/hwmon/smm665.c | 3 +-- drivers/hwmon/tps23861.c | 4 +--- drivers/hwmon/w83781d.c | 4 +--- drivers/hwmon/w83791d.c | 6 ++---- drivers/hwmon/w83792d.c | 6 ++---- drivers/hwmon/w83793.c | 6 ++---- drivers/hwmon/w83795.c | 4 +--- drivers/hwmon/w83l785ts.c | 6 ++---- drivers/i2c/i2c-core-base.c | 6 +----- drivers/i2c/i2c-slave-eeprom.c | 4 +--- drivers/i2c/i2c-slave-testunit.c | 3 +-- drivers/i2c/i2c-smbus.c | 3 +-- drivers/i2c/muxes/i2c-mux-ltc4306.c | 4 +--- drivers/i2c/muxes/i2c-mux-pca9541.c | 3 +-- drivers/i2c/muxes/i2c-mux-pca954x.c | 3 +--
Reviewed-by: Jean Delvare jdelvare@suse.de
On Tue, Jul 05, 2022 at 12:08:52PM +0200, Jean Delvare wrote:
On Tue, 28 Jun 2022 16:03:12 +0200, Uwe Kleine-König wrote:
From: Uwe Kleine-König uwe@kleine-koenig.org
The value returned by an i2c driver's remove function is mostly ignored. (Only an error message is printed if the value is non-zero that the error is ignored.)
So change the prototype of the remove function to return no value. This way driver authors are not tempted to assume that passing an error to the upper layer is a good idea. All drivers are adapted accordingly. There is no intended change of behaviour, all callbacks were prepared to return 0 before.
Signed-off-by: Uwe Kleine-König u.kleine-koenig@pengutronix.de
That's a huge change for a relatively small benefit, but if this is approved by the I2C core maintainer then fine with me. For:
Agreed, it's huge. The benefit isn't really measureable, the motivation is to improve the situation for driver authors who with the change cannot make wrong assumptions about what to return in .remove(). During the preparation this uncovered a few bugs. See for example bbc126ae381cf0a27822c1f822d0aeed74cc40d9.
drivers/hwmon/adc128d818.c | 4 +--- drivers/hwmon/adt7470.c | 3 +-- drivers/hwmon/asb100.c | 6 ++---- drivers/hwmon/asc7621.c | 4 +--- drivers/hwmon/dme1737.c | 4 +--- drivers/hwmon/f75375s.c | 5 ++--- drivers/hwmon/fschmd.c | 6 ++---- drivers/hwmon/ftsteutates.c | 3 +-- drivers/hwmon/ina209.c | 4 +--- drivers/hwmon/ina3221.c | 4 +--- drivers/hwmon/jc42.c | 3 +-- drivers/hwmon/mcp3021.c | 4 +--- drivers/hwmon/occ/p8_i2c.c | 4 +--- drivers/hwmon/pcf8591.c | 3 +-- drivers/hwmon/smm665.c | 3 +-- drivers/hwmon/tps23861.c | 4 +--- drivers/hwmon/w83781d.c | 4 +--- drivers/hwmon/w83791d.c | 6 ++---- drivers/hwmon/w83792d.c | 6 ++---- drivers/hwmon/w83793.c | 6 ++---- drivers/hwmon/w83795.c | 4 +--- drivers/hwmon/w83l785ts.c | 6 ++---- drivers/i2c/i2c-core-base.c | 6 +----- drivers/i2c/i2c-slave-eeprom.c | 4 +--- drivers/i2c/i2c-slave-testunit.c | 3 +-- drivers/i2c/i2c-smbus.c | 3 +-- drivers/i2c/muxes/i2c-mux-ltc4306.c | 4 +--- drivers/i2c/muxes/i2c-mux-pca9541.c | 3 +-- drivers/i2c/muxes/i2c-mux-pca954x.c | 3 +--
Reviewed-by: Jean Delvare jdelvare@suse.de
Thanks Uwe
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Jean Delvare -
Uwe Kleine-König