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-rw-r--r--drivers/video/tgafb.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/video/tgafb.c b/drivers/video/tgafb.c
index d292a37ec7d..5539f4d9cb7 100644
--- a/drivers/video/tgafb.c
+++ b/drivers/video/tgafb.c
@@ -5,7 +5,7 @@
* Copyright (C) 1997 Geert Uytterhoeven
* Copyright (C) 1999,2000 Martin Lucina, Tom Zerucha
* Copyright (C) 2002 Richard Henderson
- * Copyright (C) 2006 Maciej W. Rozycki
+ * Copyright (C) 2006, 2007 Maciej W. Rozycki
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
@@ -13,6 +13,7 @@
*/
#include <linux/bitrev.h>
+#include <linux/compiler.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/errno.h>
@@ -654,6 +655,9 @@ tgafb_mono_imageblit(struct fb_info *info, const struct fb_image *image)
line_length = info->fix.line_length;
rincr = (width + 7) / 8;
+ /* A shift below cannot cope with. */
+ if (unlikely(width == 0))
+ return;
/* Crop the image to the screen. */
if (dx > vxres || dy > vyres)
return;
@@ -709,9 +713,10 @@ tgafb_mono_imageblit(struct fb_info *info, const struct fb_image *image)
unsigned long bwidth;
/* Handle common case of imaging a single character, in
- a font less than 32 pixels wide. */
+ a font less than or 32 pixels wide. */
- pixelmask = (1 << width) - 1;
+ /* Avoid a shift by 32; width > 0 implied. */
+ pixelmask = (2ul << (width - 1)) - 1;
pixelmask <<= shift;
__raw_writel(pixelmask, regs_base + TGA_PIXELMASK_REG);
wmb();