matroxfb: color setting fixes

- the pseudo_palette is only 16 elements long.
- do not write to the pseudo_palette if regno (array index) is more than 15
- remove code that writes to the 17th entry of the pseudo_palette

Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Acked-by: Petr Vandrovec <vandrove@vc.cvut.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/video/matrox/matroxfb_accel.c

@@ -145,13 +145,10 @@ void matrox_cfbX_init(WPMINFO2) {
 					ACCESS_FBINFO(fbops).fb_imageblit = matroxfb_imageblit;
 				}
 				break;
-		case 16:	if (ACCESS_FBINFO(fbcon).var.green.length == 5) {
+		case 16:	if (ACCESS_FBINFO(fbcon).var.green.length == 5)
 					maccess = 0xC0000001;
-					ACCESS_FBINFO(cmap[16]) = 0x7FFF7FFF;
-				} else {
+				else
 					maccess = 0x40000001;
-					ACCESS_FBINFO(cmap[16]) = 0xFFFFFFFF;
-				}
 				mopmode = M_OPMODE_16BPP;
 				if (accel) {
 					ACCESS_FBINFO(fbops).fb_copyarea = matroxfb_copyarea;
@@ -161,7 +158,6 @@ void matrox_cfbX_init(WPMINFO2) {
 				break;
 		case 24:	maccess = 0x00000003;
 				mopmode = M_OPMODE_24BPP;
-				ACCESS_FBINFO(cmap[16]) = 0xFFFFFFFF;
 				if (accel) {
 					ACCESS_FBINFO(fbops).fb_copyarea = matroxfb_copyarea;
 					ACCESS_FBINFO(fbops).fb_fillrect = matroxfb_fillrect;
@@ -170,7 +166,6 @@ void matrox_cfbX_init(WPMINFO2) {
 				break;
 		case 32:	maccess = 0x00000002;
 				mopmode = M_OPMODE_32BPP;
-				ACCESS_FBINFO(cmap[16]) = 0xFFFFFFFF;
 				if (accel) {
 					ACCESS_FBINFO(fbops).fb_copyarea = matroxfb_copyarea;
 					ACCESS_FBINFO(fbops).fb_fillrect = matroxfb_fillrect;

drivers/video/matrox/matroxfb_base.c

@@ -679,6 +679,8 @@ static int matroxfb_setcolreg(unsigned regno, unsigned red, unsigned green,
 		mga_outb(M_DAC_VAL, blue);
 		break;
 	case 16:
+		if (regno >= 16)
+			break;
 		{
 			u_int16_t col =
 				(red << ACCESS_FBINFO(fbcon).var.red.offset)     |
@@ -690,6 +692,8 @@ static int matroxfb_setcolreg(unsigned regno, unsigned red, unsigned green,
 		break;
 	case 24:
 	case 32:
+		if (regno >= 16)
+			break;
 		ACCESS_FBINFO(cmap[regno]) =
 			(red   << ACCESS_FBINFO(fbcon).var.red.offset)   |
 			(green << ACCESS_FBINFO(fbcon).var.green.offset) |

drivers/video/matrox/matroxfb_base.h

@@ -518,7 +518,7 @@ struct matrox_fb_info {
 					dll:1;
 				      } memory;
 			      } values;
-	u_int32_t cmap[17];
+	u_int32_t cmap[16];
 };
 
 #define info2minfo(info) container_of(info, struct matrox_fb_info, fbcon)

drivers/video/matrox/matroxfb_crtc2.c

@@ -163,11 +163,6 @@ static void matroxfb_dh_disable(struct matroxfb_dh_fb_info* m2info) {
 	ACCESS_FBINFO(hw).crtc2.ctl = 0x00000004;
 }
 
-static void matroxfb_dh_cfbX_init(struct matroxfb_dh_fb_info* m2info) {
-	/* no acceleration for secondary head... */
-	m2info->cmap[16] = 0xFFFFFFFF;
-}
-
 static void matroxfb_dh_pan_var(struct matroxfb_dh_fb_info* m2info,
 		struct fb_var_screeninfo* var) {
 	unsigned int pos;
@@ -385,7 +380,6 @@ static int matroxfb_dh_set_par(struct fb_info* info) {
 			}
 		}
 		up_read(&ACCESS_FBINFO(altout).lock);
-		matroxfb_dh_cfbX_init(m2info);
 	}
 	m2info->initialized = 1;
 	return 0;

drivers/video/matrox/matroxfb_crtc2.h

@@ -28,7 +28,7 @@ struct matroxfb_dh_fb_info {
 
 	unsigned int		interlaced:1;
 
-	u_int32_t cmap[17];
+	u_int32_t cmap[16];
 };
 
 #endif /* __MATROXFB_CRTC2_H__ */