diff options
| -rw-r--r-- | drivers/video/tgafb.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/video/tgafb.c b/drivers/video/tgafb.c index d292a37ec7d6..5539f4d9cb74 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(); |