g_hid unloading issue

krunalkhetani — Fri, 08 Sep 2017 05:37:50 GMT

I am trying to test g_hid driver but facing issues while removing g_hid using rmmod

root@imx6ulnxpuiopb:~# modprobe g_hid

root@imx6ulnxpuiopb:~# rmmod g_hid

root@imx6ulnxpuiopb:~# modprobe g_hid

Segmentation fault

Kernel: Linux imx6ulnxpuiopb 4.1.15-1.2.0+g77f6154 #82 SMP PREEMPT Fri Sep 1 17:24:23 IST 2017 armv7l GNU/Linux

I split the loading of modules and I tried following commands, I think insmod in a particular scenario causing this issue.

insmod /lib/modules/4.1.15-1.2.0+g77f6154/kernel/fs/configfs/configfs.ko

rmmod /lib/modules/4.1.15-1.2.0+g77f6154/kernel/fs/configfs/configfs.ko

I tried above commands for 3 times without any problem

insmod /lib/modules/4.1.15-1.2.0+g77f6154/kernel/drivers/usb/gadget/libcomposite.ko

rmmod /lib/modules/4.1.15-1.2.0+g77f6154/kernel/drivers/usb/gadget/libcomposite.ko

I tried above commands for 3 times without any problem

insmod /lib/modules/4.1.15-1.2.0+g77f6154/kernel/drivers/usb/gadget/function/usb_f_hid.ko

rmmod /lib/modules/4.1.15-1.2.0+g77f6154/kernel/drivers/usb/gadget/function/usb_f_hid.ko

I tried above commands for 3 times without any problem

insmod /lib/modules/4.1.15-1.2.0+g77f6154/kernel/drivers/usb/gadget/legacy/g_hid.ko

rmmod /lib/modules/4.1.15-1.2.0+g77f6154/kernel/drivers/usb/gadget/legacy/g_hid.ko

This is problematic part and dumps the core on second attempt.

If it would have been a driver issue it should show kernel panic instead its dumping the core.

Can anyone please help me on this?

Re: g_hid unloading issue

igorpadykov — Mon, 11 Sep 2017 09:49:23 GMT

Hi Krunal

please refer to sect.39.3.9 Loadable Module Support attached Linux Manual.

Non specific to nxp usb driver issues may be posted on kernel mail list:

Majordomo Lists at VGER.KERNEL.ORG

Best regards
igor
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topic Re: g_hid unloading issue in i.MX Processors

g_hid unloading issue

Re: g_hid unloading issue