[PATCH] sched: fix scheduling latencies in vgacon.c

This patch fixes scheduling latencies in vgacon_do_font_op().  The code is
protected by vga_lock already so it's safe to drop (and re-acquire) the
BKL.

Has been tested in the -VP patchset.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/video/console/vgacon.c

@@ -49,6 +49,7 @@
 #include <linux/spinlock.h>
 #include <linux/ioport.h>
 #include <linux/init.h>
+#include <linux/smp_lock.h>
 #include <video/vga.h>
 #include <asm/io.h>
 
@@ -763,6 +764,7 @@ static int vgacon_do_font_op(struct vgastate *state,char *arg,int set,int ch512)
 		charmap += 4 * cmapsz;
 #endif
 
+	unlock_kernel();
 	spin_lock_irq(&vga_lock);
 	/* First, the Sequencer */
 	vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1);
@@ -848,6 +850,7 @@ static int vgacon_do_font_op(struct vgastate *state,char *arg,int set,int ch512)
 		vga_wattr(state->vgabase, VGA_AR_ENABLE_DISPLAY, 0);	
 	}
 	spin_unlock_irq(&vga_lock);
+	lock_kernel();
 	return 0;
 }