[AGPGART] Add missing calls to global_flush_tlb() to ali-agp

add missing calls to global_flush_tlb().

Signed-off-by: Jan Beulich <[e-mail]>
Signed-off-by: Dave Jones <[e-mail]>

drivers/char/agp/ali-agp.c

···
 	void *addr = agp_generic_alloc_page(agp_bridge);
 	u32 temp;
 
+	global_flush_tlb();
 	if (!addr)
 		return NULL;
 
···
 	if (addr) {
 		global_cache_flush();	/* is this really needed?  --hch */
 		agp_generic_destroy_page(addr);
+		global_flush_tlb();
 	}
 }