iommu: Convert to devm_ioremap_resource()

Convert all uses of devm_request_and_ioremap() to the newly introduced
devm_ioremap_resource() which provides more consistent error handling.

devm_ioremap_resource() provides its own error messages so all explicit
error messages can be removed from the failure code paths.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Cc: Joerg Roedel <joro@8bytes.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/iommu/tegra-smmu.c

@@ -19,6 +19,7 @@
 
 #define pr_fmt(fmt)	"%s(): " fmt, __func__
 
+#include <linux/err.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/spinlock.h>
@@ -1176,9 +1177,9 @@ static int tegra_smmu_probe(struct platform_device *pdev)
 		res = platform_get_resource(pdev, IORESOURCE_MEM, i);
 		if (!res)
 			return -ENODEV;
-		smmu->regs[i] = devm_request_and_ioremap(&pdev->dev, res);
-		if (!smmu->regs[i])
-			return -EBUSY;
+		smmu->regs[i] = devm_ioremap_resource(&pdev->dev, res);
+		if (IS_ERR(smmu->regs[i]))
+			return PTR_ERR(smmu->regs[i]);
 	}
 
 	err = of_get_dma_window(dev->of_node, NULL, 0, NULL, &base, &size);