viafb: some virtual_xres handling fixes

Do not require the virtual_xres to be aligned as line length is for such
purposes.  Calculate always the smallest line length required.
Signed-off-by: NFlorian Tobias Schandinat <FlorianSchandinat@gmx.de>
Cc: Joseph Chan <JosephChan@via.com.tw>
Cc: Scott Fang <ScottFang@viatech.com.cn>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/video/via/viafbdev.c

@@ -107,8 +107,7 @@ static void viafb_update_fix(struct fb_info *info)
 
 	info->fix.visual =
 		bpp == 8 ? FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
-	info->fix.line_length =
-		((info->var.xres_virtual + 7) & ~7) * bpp / 8;
+	info->fix.line_length = (info->var.xres_virtual * bpp / 8 + 7) & ~7;
 }
 
 static void viafb_setup_fixinfo(struct fb_fix_screeninfo *fix,
@@ -148,7 +147,7 @@ static int viafb_check_var(struct fb_var_screeninfo *var,
 	int htotal, vtotal, depth;
 	struct VideoModeTable *vmode_entry;
 	struct viafb_par *ppar = info->par;
-	u32 long_refresh;
+	u32 long_refresh, line;
 
 	DEBUG_MSG(KERN_INFO "viafb_check_var!\n");
 	/* Sanity check */
@@ -180,11 +179,8 @@ static int viafb_check_var(struct fb_var_screeninfo *var,
 		depth = 24;
 
 	viafb_fill_var_color_info(var, depth);
-	if ((var->xres_virtual * (var->bits_per_pixel >> 3)) & 0x1F)
-		/*32 pixel alignment */
-		var->xres_virtual = (var->xres_virtual + 31) & ~31;
-	if (var->xres_virtual * var->yres_virtual * var->bits_per_pixel / 8 >
-		ppar->memsize)
+	line = (var->xres_virtual * var->bits_per_pixel / 8 + 7) & ~7;
+	if (line * var->yres_virtual > ppar->memsize)
 		return -EINVAL;
 
 	/* Based on var passed in to calculate the refresh,