On Thu, Jul 17, 2003 at 02:49:07PM -0700, Greg KH wrote: > On Thu, Jul 17, 2003 at 06:37:15PM +0200, Gerd Knorr wrote: > > > > Version (1) can be done without breaking the build, with a hack along > > the lines "if (no release callback) printk(KERN_WARN please fix your > > driver)", so the drivers can be fixed step-by-step afterwards. > > That sounds like a nice way to start. > > > Fixing the drivers might be non-trivial through. Some drivers are > > hot-pluggable (usb cams), some drivers register more than one v4l device > > (bttv wants up to three). Those drivers can't just call kfree() in the > > ->release callback because there might be other references, some open > > file handle for a unplugged usb cam, another not-yet unregistered > > v4l device, whatever. Probably they must implement some reference > > counting scheme to get that right. The very simple ones (in > > drivers/media/radio for example) likely just need the kfree() moved > > from the ->remove function into the new ->release() callback. > > I don't think it will be that bad for them. Just have them change the > v4l device from being a structure included in their structure, into a > pointer, and then create it before registering, and free it in the > release() callback. > > That being said, I haven't actually looked at the code to verify that > this is all that is needed :) > > > Version (2) needs every v4l driver touched to make it compile again. > > Not sure how hard it is to fixup them. I'd guess it is pretty straigt > > forward to do the conversion, it's just alot of work. I also could do > > a number of other cleanups along the way. Maybe I trap into some hidden > > pitfalls through, havn't looked at all the drivers in detail yet. > > Breaking the build is a very good thing to do at times, to ensure that > stuff gets fixed properly. Users might go for a while without realizing > that there really is a problem in their driver. > > But in the end, it's up to you... > > thanks, > > greg k-h
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