kernel crashes when USB disconnected() is called in between usb_snd_msg()

lyfsci — Mon, 18 Jan 2016 03:13:47 GMT

Hi Experts,

I created a sample USB driver with character device access from user space.

I write a user space program to access the kernel driver write() function where I call usb_bulk_msg() to write in BULK OUT endpoint.

When I removed the USB in-between write transfer it crashes where the disconnect() is being invoked.

Regards,

Lyf

Re: kernel crashes when USB disconnected() is called in between usb_snd_msg()

weidong_sun — Mon, 18 Jan 2016 09:05:58 GMT

Hi Lyf,

Sorry to say it is not within the scope of our support on how to write a USB driver !

Suggest you had better refer to some books on linux driver.

Regards,

Weidong