udlfb: allow reallocating the framebuffer
This patch changes udlfb so that it may reallocate the framebuffer when setting higher-resolution mode. If we boot the system without monitor attached, udlfb creates a framebuffer with the size 800x600. This patch makes it possible to select higher videomode with the fbset command when a monitor is attached. Note that there is no reliable way to prevent the system from touching the old framebuffer, so we must not free it. We add it to the list dlfb->deferred_free and free it when the driver is unloaded. Signed-off-by: NMikulas Patocka <mpatocka@redhat.com> [b.zolnierkie: sparse fixes] Signed-off-by: NBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
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