On Sat, Jun 25, 2022 at 05:21:06PM +0800, duoming@xxxxxxxxxx wrote:
> Hello,
>
> > > On Thu, Jun 23, 2022 at 01:59:12PM +0800, Duoming Zhou wrote:
> > > > There are sleep in atomic context bugs when dm_fsync_timer_callback is
> > > > executing. The root cause is that the memory allocation functions with
> > > > GFP_KERNEL or GFP_NOIO parameters are called in dm_fsync_timer_callback
> > > > which is a timer handler. The call paths that could trigger bugs are
> > > > shown below:
> > > >
> > > > (interrupt context)
> > > > dm_fsync_timer_callback
> > > > write_nic_byte
> > > > kzalloc(sizeof(data), GFP_KERNEL); //may sleep
> > > > usb_control_msg
> > > > kmalloc(.., GFP_NOIO); //may sleep
> > > > write_nic_dword
> > > > kzalloc(sizeof(data), GFP_KERNEL); //may sleep
> > > > usb_control_msg
> > > > kmalloc(.., GFP_NOIO); //may sleep
> > > >
> > > > This patch uses delayed work to replace timer and moves the operations
> > > > that may sleep into the delayed work in order to mitigate bugs.
> > > >
> > > > Fixes: 8fc8598e61f6 ("Staging: Added Realtek rtl8192u driver to staging")
> > > > Signed-off-by: Duoming Zhou <duoming@xxxxxxxxxx>
> > > > ---
> > > > Changes in v2:
> > > > - Use delayed work to replace timer.
> > >
> > > Did you test this with real hardware to verify it still works?
> >
> > I am testing this and I will give you feedback within one or two days.
>
> Do you know what vendor id and device id use the r8192u_usb driver?
The vendor/device ids are in the driver itself. Also in the output of
modinfo:
❯ modinfo drivers/staging/rtl8192u/r8192u_usb.ko | grep alias
alias: usb:v043Ep7A01d*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v5A57p0290d*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v2001p3301d*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v1740p9201d*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v0DF6p0031d*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v050Dp805Ed*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v07AAp0043d*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v0BDAp8709d*dc*dsc*dp*ic*isc*ip*in*
see the "v" and "p" portions of the alias string.
thanks,
greg k-h
