diff --git a/target/linux/xburst/files-2.6.31/drivers/misc/jz4740-adc.c b/target/linux/xburst/files-2.6.31/drivers/misc/jz4740-adc.c
index eb034055a..7da3bccc3 100644
--- a/target/linux/xburst/files-2.6.31/drivers/misc/jz4740-adc.c
+++ b/target/linux/xburst/files-2.6.31/drivers/misc/jz4740-adc.c
@@ -161,7 +161,7 @@ uint32_t val)
 
 	cfg = readl(adc->base + JZ_REG_ADC_CFG);
 
-	cfg &= mask;
+	cfg &= ~mask;
 	cfg |= val;
 
 	writel(cfg, adc->base + JZ_REG_ADC_CFG);
@@ -293,7 +293,7 @@ static int __devinit jz4740_adc_probe(struct platform_device *pdev)
 	}
 
 	ret = device_create_file(&pdev->dev, &dev_attr_adcin);
-	if (!ret) {
+	if (ret) {
 		dev_err(&pdev->dev, "Failed to create sysfs file: %d\n", ret);
 		goto err_free_irq;
 	}