On Mon, 2022-01-24 at 13:36 +0100, Thomas Zimmermann wrote: > Hot-unplug all firmware-framebuffer devices as part of removing > them via remove_conflicting_framebuffers() et al. Releases all > memory regions to be acquired by native drivers. > > Firmware, such as EFI, install a framebuffer while posting the > computer. After removing the firmware-framebuffer device from fbdev, > a native driver takes over the hardware and the firmware framebuffer > becomes invalid. > > Firmware-framebuffer drivers, specifically simplefb, don't release > their device from Linux' device hierarchy. It still owns the firmware > framebuffer and blocks the native drivers from loading. This has been > observed in the vmwgfx driver. [1] > > Initiating a device removal (i.e., hot unplug) as part of > remove_conflicting_framebuffers() removes the underlying device and > returns the memory range to the system. > > [1] > https://lore.kernel.org/dri-devel/20220117180359.18114-1-zack@xxxxxxx/ > > Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx> > CC: stable@xxxxxxxxxxxxxxx # v5.11+ Looks great, thanks! Reviewed-by: Zack Rusin <zackr@xxxxxxxxxx>
