On Tue, May 23, 2017 at 03:14:22AM +0300, Dmitry Osipenko wrote: > The framebuffers console fbcon_startup() increments the tegra_drm module > 'use' refcount via try_module_get(), causing an interlock of the DRM subsys > and the tegra_drm modules. In result, the tegra_drm module can't be unloaded > using rmmod. > > Signed-off-by: Dmitry Osipenko <dig...@gmail.com> > --- > drivers/gpu/drm/tegra/fb.c | 1 - > 1 file changed, 1 deletion(-)
That's done on purpose because otherwise you could just rip out the driver from under the framebuffer emulation and things would crash. My understanding is that the right way to unload a module is to unbind the driver first (which will cause the framebuffer to be removed and hence the reference to be dropped) before the rmmod. Thierry
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