Hi Mauro, On Mon, Oct 09, 2017 at 08:22:39AM -0300, Mauro Carvalho Chehab wrote: > Em Thu, 5 Oct 2017 00:50:20 +0300 > Sakari Ailus <sakari.ai...@linux.intel.com> escreveu: > > > Remove V4L2 async re-probing support. The re-probing support has been > > there to support cases where the sub-devices require resources provided by > > the main driver's hardware to function, such as clocks. > > > > Reprobing has allowed unbinding and again binding the main driver without > > explicilty unbinding the sub-device drivers. This is certainly not a > > common need, and the responsibility will be the user's going forward. > > > > An alternative could have been to introduce notifier specific locks. > > Considering the complexity of the re-probing and that it isn't really a > > solution to a problem but a workaround, remove re-probing instead. > > If the re-probing isn't using anywhere, that sounds a nice cleanup. > Did you check if this won't break any driver (like soc_camera)?
That was discussed earlier in the review; Laurent asked the same question. Re-probing never was a proper solution to any problem; it was just a hack to avoid unbinding the sensor if the bridge driver was unbound, no more: it can't be generalised to support more complex use cases. Mind you, this is on devices that aren't actually removable. I've briefly discussed this with Laurent; the proper solution would need to be implemented in the clock framework instead. There, the existing clocks obtained by drivers could be re-activated when the driver for them comes back. My proposal is that if there's real a need to address this, then it could be solved in the clock framework. -- Kind regards, Sakari Ailus e-mail: sakari.ai...@iki.fi
