Ev3dev: ENOMEM when using I2C sensors with HiTechnic Sensor Multiplexer

[dlech]

In https://github.com/ev3dev/ev3dev-lang-python/issues/586, @w1ref1re wrote:

If I run dmesg | tail there are the lines

[ 1277.145774] ht-nxt-smux-i2c-sensor: probe of ev3-ports:in2:i2c8:mux1:lego-nxt-us failed with error -12
[ 1277.146681] lego-port port12: Added new device 'ev3-ports:in2:i2c8:mux1:lego-nxt-us'

[dlech]

Totally forgot to allocate the memory for data->sensor.mode_info here: https://github.com/ev3dev/lego-linux-drivers/blob/3a92db95671708319f3c6a33cd044cb23e7e782a/sensors/ht_nxt_smux_i2c_sensor.c#L93-L97

Compare to: https://github.com/ev3dev/lego-linux-drivers/blob/3a92db95671708319f3c6a33cd044cb23e7e782a/sensors/nxt_i2c_sensor_core.c#L231-L236

[w1ref1re]

Can I fix this on my own? If yes can I have some explanation how to do it please?

[dlech]

You would need to build your own kernel to fix this. You can find info at https://github.com/ev3dev/ev3dev-buildscripts/#system-requirements

And hopefully it should be obvious (from the links above) which line you need to copy and paste to actually fix the problem.

[w1ref1re]

Thank you. The line was obvious I just wondered where i can find the file. I will give it a try thanks.

[dlech]

Fix released in ev3dev-2.3.2-ev3 kernel.