Re: No message is showed after USB gadget has configured

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Mon, Jan 20, 2020 at 09:48:24AM +0000, Peter Chen wrote:
>  
> > On Mon, Jan 20, 2020 at 09:03:59AM +0000, Peter Chen wrote:
> > > Hi all,
> > >
> > > >From commit 1cbfb8c4f62d ("usb: gadget: Quieten gadget config
> > > >message"),
> > > there is no any message from gadget side after it connects to host and
> > > works correctly. Although we could cat "state" under
> > > /sys/class/udc/$CONTROLLER/ to know its state, we can't easily know if
> > > the gadget works or not from console, USB host could have many
> > > messages after one device has connected, why we can't keep one for USB
> > > gadget?
> > 
> > Why not make "normal" USB devices quieter too? :)
> > 
> > Surely you do not have tools that watch syslog to determine if a device is working
> > properly or not, right?  That's what sysfs is for, not syslog entries.
> > 
> 
> Yes, we use our eyes during the hot plug test for device or count the number of
> messages for it, with this change, it may cause difficult for hot plug test. For
> other tests, we could judge sysfs before later tests.
> 
> Since this message in there many years, we (and tester) may need time to adapt for
> this change.

Can you just turn on dynamic debugging for that one line with a simple
echo to the debugfs file so that you still see this in your test
framework?

thanks,

greg k-h