From: Fabien Parent <fparent@baylibre.com>
Date: Wed, 3 Apr 2019 19:30:50 +0000 (+0200)
Subject: mmc: mtk-sd: check for valid optional memory resource
X-Git-Tag: v5.4-rc1~1078^2~40
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b65be6355183f6cb82518d02a4067239f6175558;p=platform%2Fkernel%2Flinux-rpi.git

mmc: mtk-sd: check for valid optional memory resource

'top_base' memory region is optional. Check that the resource is valid
before using it. This avoid getting a "invalid resource" error message
printed by the kernel.

Signed-off-by: Fabien Parent <fparent@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
---

diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index bd731bd..0798f0b 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -2134,9 +2134,11 @@ static int msdc_drv_probe(struct platform_device *pdev)
 	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-	host->top_base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(host->top_base))
-		host->top_base = NULL;
+	if (res) {
+		host->top_base = devm_ioremap_resource(&pdev->dev, res);
+		if (IS_ERR(host->top_base))
+			host->top_base = NULL;
+	}
 
 	ret = mmc_regulator_get_supply(mmc);
 	if (ret)