linux-kernel - [PATCH v2] mmc: mtk-sd: check for valid optional memory resource

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Date:   Wed,  3 Apr 2019 21:30:50 +0200
From:   Fabien Parent <fparent@...libre.com>
To:     ulf.hansson@...aro.org, matthias.bgg@...il.com,
        yingjoe.chen@...iatek.com
Cc:     chaotian.jing@...iatek.com, ryder.lee@...iatek.com,
        jjian.zhou@...iatek.com, linux-mmc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Fabien Parent <fparent@...libre.com>
Subject: [PATCH v2] 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>
---

V2:
	Fix invalid condition: check against 'res' variable instead of 'ret'.

---
 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..61bf8704491c 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 (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)
-- 
2.20.1