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

[Fabien Parent]

'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 <fpar...@baylibre.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