[PATCH] radeonfb: don't blow up VGA console on load

The current radeonfb memset's the framebuffer to 0 when loaded.  This
removes occasional artifacts but has the nasty side effect that if you
load radeonfb without framebuffer console, you destroy the VGA text
buffer, font, etc...  radeon must not touch the framebuffer content when
it doesn't "own" it.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/video/aty/radeon_base.c

@@ -2374,10 +2374,9 @@ static int radeonfb_pci_register (struct pci_dev *pdev,
 	} while (   rinfo->fb_base == 0 &&
 		  ((rinfo->mapped_vram /=2) >= MIN_MAPPED_VRAM) );
 
-	if (rinfo->fb_base)
-		memset_io(rinfo->fb_base, 0, rinfo->mapped_vram);
-	else {
-		printk (KERN_ERR "radeonfb (%s): cannot map FB\n", pci_name(rinfo->pdev));
+	if (rinfo->fb_base == NULL) {
+		printk (KERN_ERR "radeonfb (%s): cannot map FB\n",
+			pci_name(rinfo->pdev));
 		ret = -EIO;
 		goto err_unmap_rom;
 	}