On Fri, Feb 21, 2020 at 10:36 PM Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> wrote: > Quoting Daniel Vetter (2020-02-21 21:02:30) > > For two reasons: > > > > - The driver core clears this already for us after we're unloaded in > > __device_release_driver(). > > Even if we abort before loading? > > History notes that i915_pci_remove was called with a stale pointer on > error. So even if there's a bug we still have the problem that clearing the pci_drvdata in our drm_driver->release hook is way too late. You could already have bound a new driver to the underlying device. So if driver core doesn't clear drvdata on bind failure and we need to clear this ourselves, then this line here could actually clear the drvdata of the next driver instance bound to the pci device. Not that that's ever going to happen outside of very contrived testing. But looking at really_probe() in base/dd.c we do clear drvdata on failure. So no idea how/why that stale drvdata came to be. Anyway that's kinda why I cc'ed Greg, so he could confirm that this is correct. -Daniel -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
