Linux driver of vt6656 from staging area causes system to freeze.
gregkh at linuxfoundation.org
Thu Feb 3 03:54:53 EST 2022
On Thu, Feb 03, 2022 at 01:41:11AM +0100, Philipp Hortmann wrote:
> I managed to get a device vt6656 (USB WiFi adapter). The device works OK
> when the computer is started and driver loaded. When the WLAN is disabled
> the system freezes often.
> I am using ubuntu 20.04 with kernel 5.17.0-rc1 x86_64
> branch: staging-testing
> After some tries I found out that it is a function in vnt_stop() main_usb.c
> with the following line that is causing this.
> But this memory is after this line still in use.
What "memory" do you mean?
> Digging deeper I found that the usb_submit_urb() function (in usbpipe.c
> vnt_start_interrupt_urb_complete) is called after the usb_kill_urb() is
> So I tied the execution of the usb_submit_urb() to a flag called
> DEVICE_FLAGS_DISCONNECTED. After that no crashes were observed.
> So here my questions:
> - Is this the right place to fix?
Does it work for you? If so, let's try it.
> - Do I need to log a bug report before a patch?
Not at all. Please read the documention for how to submit a kernel
patch and we can take it from there. The patch looks sane, now just
submit it correctly and we can review it and maybe apply it from there.
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