linux-kernel - [PATCH 09/24] mmc: mtk-sd: check for valid optional memory resource

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Date:   Sat, 23 Mar 2019 22:15:57 +0100
From:   Fabien Parent <fparent@...libre.com>
To:     matthias.bgg@...il.com, robh+dt@...nel.org, mark.rutland@....com
Cc:     sean.wang@...nel.org, ryder.lee@...iatek.com,
        hsin-hsiung.wang@...iatek.com, wenzhen.yu@...iatek.com,
        chaotian.jing@...iatek.com, yong.mao@...iatek.com,
        jjian.zhou@...iatek.com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-mmc@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-spi@...r.kernel.org, linux-watchdog@...r.kernel.org,
        linux-clk@...r.kernel.org, stephane.leprovost@...iatek.com,
        Fabien Parent <fparent@...libre.com>
Subject: [PATCH 09/24] 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@...libre.com>
---
 drivers/mmc/host/mtk-sd.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index 833ef0590af8..573aa127d00b 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -2123,9 +2123,11 @@ 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 (ret) {
+		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)
-- 
2.20.1