On Fri, Jan 27, 2017 at 03:05:46PM +0100, Daniel Vetter wrote: > On Fri, Jan 27, 2017 at 10:36:16AM +0100, Thierry Reding wrote: > > On Fri, Jan 27, 2017 at 08:49:34AM +0100, Daniel Vetter wrote: > > > On Thu, Jan 26, 2017 at 11:56:02PM +0100, Noralf Trønnes wrote: > > > > This patchset removes the need for drivers to clean up their debugfs > > > > files on exit. It is done automatically in drm_debugfs_cleanup(). > > > > This funtion is also called should the driver error out in it's > > > > drm_driver.debugfs_init callback. > > > > > > > > Two drivers still use drm_debugfs_remove_files(): > > > > - tegra in it's connectors, not sure if I can remove it. > > > > > > I read through them, and they're removed on the component device nodes > > > stuff. That looks somewhat fishy from a lifetime point of view, and I > > > think removing all that code would be better, too. > > > > What makes you think that's problematic from a lifetime point of view? > > The component device is tied to the DRM device, so these callbacks are > > called at the right time. > > debugfs is a userspace interface, which should disappear when > drm_dev_unregister gets called. I'm not sure at all whether that lines up > with the cleanup of all your component nodes, but otoh it's rather > academic since you can't hotplug a tegra. > > > That said, I think it's safe to remove the other debugfs files from > > Tegra. It might not be possible to remove the cleanup functions > > altogether, though, because they have to do a special dance involving > > kmemdup() drm_debugfs_create_files() and kfree() in order to support > > debugfs files for multiple instances of subdevices. > > Hm, that entire "do debugfs on the minor" thing makes almost never sense. > All the things we have left in modern drivers are either per-fd, or > per-device. Nothing of interest is per-minor. Or do you mean something > else? I'm not sure I understand what you're saying. We have plenty of code that adds debugfs files to the connector's debugfs entry. And that's within the minor's debugfs root. Am I missing something? Thierry
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