Re: [Outreachy kernel] Re: Trouble with IIO dummy build.

[Alison Schofield <amsfield22@gmail.com>]

On Tue, Mar 14, 2017 at 07:07:54PM -0700, Varsha Rao wrote:
> Hello,
> 
> I am again having issues with dummy modules compilation. I am unable to 
> create sub directory after mounting.
> 
>  $ sudo mount -t configfs none /config
>  $ sudo mkdir /config/iio/devices/dummy/my_dummy_device
>   mkdir: cannot create directory 
> ‘/config/iio/devices/dummy/my_dummy_device’: Invalid argument
>  
>  I have the following permissions set for the file.
> 
>  drwxr-xr-x.  3 root root    0 Mar 15 07:06 .
>  dr-xr-xr-x. 19 root root 4096 Mar 14 23:55 ..
>  drwxr-xr-x.  3 root root    0 Mar 15 07:06 iio
> 
>  I can create sub directory if the directory is not mounted.
>  I  also have iio files created in  /sys/kernel/config, even though I have 
> not mounted it.  
>  $ ls -al /sys/kernel/config/
>   total 0
>  drwxr-xr-x.  3 root root 0 Mar 15 07:06 .
>  drwxr-xr-x. 11 root root 0 Mar 15 06:28 ..
>  drwxr-xr-x.  3 root root 0 Mar 15 07:06 iio
>  
>  As earlier these commands worked, don't know if this is causing the 
> problem.
>  I tried to mkdir in /config after unmounting  /sys/kernel/config, it did 
> not work.
>  $ cat /etc/mtab | grep "config"
>  configfs /sys/kernel/config configfs rw,relatime 0 0
>  none /config configfs rw,relatime 0 0
>  
>  I am able to run the following commands successfully.
>   sudo modprobe iio_dummy_evgen
>   sudo modprobe iio_dummy
>   sudo mount -t configfs none /config
>   ls -l /sys/bus/iio/devices/iio_evgen/
> 
>  I am using fedora 25 x86_64 with kernel version 4.11.0-rc1+.

Varsha, 

Do you still have the patch applied?
per Daniel's previous email:

 http://marc.info/?l=linux-iio&m=148907643001389&w=2
 if you use CONFIG_IIO_SW_DEVICE=m

 You can workaround the patch above if you select
 CONFIG_IIO_SW_DEVICE=y


alisons

>  
>  $ cat .config | grep IIO
> # CONFIG_SENSORS_IIO_HWMON is not set
> CONFIG_DVB_USB_FRIIO=m
> # IIO staging drivers
> CONFIG_IIO=m
> CONFIG_IIO_BUFFER=y
> CONFIG_IIO_BUFFER_CB=m
> CONFIG_IIO_KFIFO_BUF=m
> CONFIG_IIO_TRIGGERED_BUFFER=m
> CONFIG_IIO_CONFIGFS=m
> CONFIG_IIO_TRIGGER=y
> CONFIG_IIO_CONSUMERS_PER_TRIGGER=2
> CONFIG_IIO_SW_DEVICE=m
> CONFIG_IIO_SW_TRIGGER=m
> CONFIG_IIO_ST_ACCEL_3AXIS=m
> CONFIG_IIO_ST_ACCEL_I2C_3AXIS=m
> CONFIG_IIO_ST_ACCEL_SPI_3AXIS=m
> # Hid Sensor IIO Common
> CONFIG_HID_SENSOR_IIO_COMMON=m
> CONFIG_HID_SENSOR_IIO_TRIGGER=m
> # CONFIG_IIO_SSP_SENSORHUB is not set
> CONFIG_IIO_ST_SENSORS_I2C=m
> CONFIG_IIO_ST_SENSORS_SPI=m
> CONFIG_IIO_ST_SENSORS_CORE=m
> # IIO dummy driver
> CONFIG_IIO_DUMMY_EVGEN=m
> CONFIG_IIO_SIMPLE_DUMMY=m
> CONFIG_IIO_SIMPLE_DUMMY_EVENTS=y
> CONFIG_IIO_SIMPLE_DUMMY_BUFFER=y
> CONFIG_IIO_ST_GYRO_3AXIS=m
> CONFIG_IIO_ST_GYRO_I2C_3AXIS=m
> CONFIG_IIO_ST_GYRO_SPI_3AXIS=m
> # CONFIG_IIO_ST_LSM6DSX is not set
> CONFIG_IIO_ADIS_LIB=m
> CONFIG_IIO_ADIS_LIB_BUFFER=y
> CONFIG_IIO_ST_MAGN_3AXIS=m
> CONFIG_IIO_ST_MAGN_I2C_3AXIS=m
> CONFIG_IIO_ST_MAGN_SPI_3AXIS=m
> # CONFIG_IIO_HRTIMER_TRIGGER is not set
> CONFIG_IIO_INTERRUPT_TRIGGER=m
> CONFIG_IIO_TIGHTLOOP_TRIGGER=m
> # CONFIG_IIO_SYSFS_TRIGGER is not set
> # CONFIG_IIO_ST_PRESS is not set
> 
>  Any ideas?
>  
>  Thanks,
>  Varsha
> 
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