On Thu, Apr 27, 2023 at 7:02 PM Daniel Vetter <daniel@xxxxxxxx> wrote: > > On Tue, Apr 25, 2023 at 08:02:40AM +0000, Brandon Pollack wrote: > > added documentation to drm_dev_unregister clarifying that devres managed > > devices allocated with devm_drm_dev_alloc do not require calls to > > drm_dev_put. > > > > Signed-off-by: Brandon Pollack <brpol@xxxxxxxxxxxx> > > > > --- > > > > This is my first patch to any tree. I've tried my best to read as many > > kernel docs etc as possible (wip). This took me a moment to realize so I > > figured it was as good a candidate as any for a first patch (at the very > > least to make sure I have the whole patching process figured out). I > > hope to make more janitorial changes as I continue to learn leading up > > to the work I hope to do. > > > > We're hoping to add multiple display hotplug output support to VKMS for > > testing purposes. Some work has been done already, but we'll be taking > > over moving forward. Our intent is to remain involved and assist in > > maintaining these changes. > > > > Looking forward to your comments/advice (now and henceforth!) > > Looking good! > > Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx> > > Since you're @chromium.org I'm assuming that one of the cros committers > will push this to drm-misc-next. If not please holler. > -Daniel I'm actually working in relative isolation on this (I'm located in Tokyo) so please go ahead. I'll get in touch with some of those folks soon :) > > > --- > > drivers/gpu/drm/drm_drv.c | 4 +++- > > 1 file changed, 3 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c > > index cee0cc522ed9..12687dd9e1ac 100644 > > --- a/drivers/gpu/drm/drm_drv.c > > +++ b/drivers/gpu/drm/drm_drv.c > > @@ -969,7 +969,9 @@ EXPORT_SYMBOL(drm_dev_register); > > * > > * Unregister the DRM device from the system. This does the reverse of > > * drm_dev_register() but does not deallocate the device. The caller must call > > - * drm_dev_put() to drop their final reference. > > + * drm_dev_put() to drop their final reference, unless it is managed with devres > > + * (as devices allocated with devm_drm_dev_alloc() are), in which case there is > > + * already an unwind action registered. > > * > > * A special form of unregistering for hotpluggable devices is drm_dev_unplug(), > > * which can be called while there are still open users of @dev. > > -- > > 2.40.0.634.g4ca3ef3211-goog > > > > -- > Daniel Vetter > Software Engineer, Intel Corporation > http://blog.ffwll.ch
