atyfb: correct_chipset() can fail

Atari probe code relies on correct_chipset() failing if the device is not
a mach64 GX/CX.  aty_chips[] array would be indexed with -1 in that case.

Signed-off-by: Ville Syrjala <syrjala@sci.fi>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/video/aty/atyfb_base.c b/drivers/video/aty/atyfb_base.c
index d7ba3f1a4d80..d6903c70bee5 100644
--- a/drivers/video/aty/atyfb_base.c
+++ b/drivers/video/aty/atyfb_base.c
@@ -424,7 +424,6 @@ static struct {
 #endif /* CONFIG_FB_ATY_CT */
 };
 
-/* can not fail */
 static int __devinit correct_chipset(struct atyfb_par *par)
 {
         u8 rev;
@@ -437,6 +436,9 @@ static int __devinit correct_chipset(struct atyfb_par *par)
                 if (par->pci_id == aty_chips[i].pci_id)
                         break;
 
+        if (i < 0)
+                return -ENODEV;
+
         name = aty_chips[i].name;
         par->pll_limits.pll_max = aty_chips[i].pll;
         par->pll_limits.mclk = aty_chips[i].mclk;