On Wed, Jun 05, 2019 at 04:18:12PM +0200, Wolfram Sang wrote:
> 
> > To enable dynamic debugging in driver core you could use something like
> > 
> > 	CONFIG_CMDLINE="dyndbg=\"func really_probe =p\""
> > 
> > That gives you two printouts per successful probe, for example:
> > 
> > 	bus: 'usb-serial': really_probe: probing driver edgeport_ti_1 with device ttyUSB0
> > 	bus: 'usb-serial': really_probe: bound device ttyUSB0 to driver edgeport_ti_1
> 
> I agree that this scales much better than adding strings to every
> driver. Also, the driver core will report failed probes other than
> -ENODEV, or?

Right, errors other than -EPROBE_DEFER, -ENODEV and -ENXIO are always
logged, and the previous three would also be logged with debugging
enabled.

Johan