staging: xgifb: fail the probe if no supported LCD video mode found

Fail the probe if the LCD resolution described in card firmware does
not match any of the supported modes.
Signed-off-by: NAaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/xgifb/XGI_main_26.c

@@ -449,7 +449,7 @@ static int XGIfb_GetXG21DefaultLVDSModeIdx(void)
 		XGIfb_mode_idx++;
 	}
 	if (!found_mode)
-		XGIfb_mode_idx = 0;
+		XGIfb_mode_idx = -1;
 
 	return XGIfb_mode_idx;
 }
@@ -2313,6 +2313,11 @@ static int __devinit xgifb_probe(struct pci_dev *pdev,
 		}
 	}
 
+	if (xgifb_mode_idx < 0) {
+		dev_err(&pdev->dev, "no supported video mode found\n");
+		goto error_1;
+	}
+
 	if (xgi21_drvlcdcaplist) {
 		int m;