linux-kernel - [PATCH] drivers: Inline code in devm_platform_ioremap

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Date:   Fri, 14 Jun 2019 11:22:40 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     Enrico Weigelt <lkml@...ux.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     cocci@...teme.lip6.fr, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Gilles Muller <Gilles.Muller@...6.fr>,
        Himanshu Jha <himanshujha199640@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nicolas Palix <nicolas.palix@...g.fr>
Subject: [PATCH] drivers: Inline code in devm_platform_ioremap_resource() from
 two functions

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Fri, 14 Jun 2019 11:05:33 +0200

Two function calls were combined in this function implementation.
Inline corresponding code so that extra error checks can be avoided here.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/base/platform.c | 39 ++++++++++++++++++++++++++++++++++-----
 1 file changed, 34 insertions(+), 5 deletions(-)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 4d1729853d1a..baadca72f949 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -80,8 +80,8 @@ struct resource *platform_get_resource(struct platform_device *dev,
 EXPORT_SYMBOL_GPL(platform_get_resource);

 /**
- * devm_platform_ioremap_resource - call devm_ioremap_resource() for a platform
- *				    device
+ * devm_platform_ioremap_resource
+ * Achieve devm_ioremap_resource() functionality for a platform device
  *
  * @pdev: platform device to use both for memory resource lookup as well as
  *        resource management
@@ -91,10 +91,39 @@ EXPORT_SYMBOL_GPL(platform_get_resource);
 void __iomem *devm_platform_ioremap_resource(struct platform_device *pdev,
 					     unsigned int index)
 {
-	struct resource *res;
+	u32 i;

-	res = platform_get_resource(pdev, IORESOURCE_MEM, index);
-	return devm_ioremap_resource(&pdev->dev, res);
+	for (i = 0; i < pdev->num_resources; i++) {
+		struct resource *res = &pdev->resource[i];
+
+		if (resource_type(res) == IORESOURCE_MEM && index-- == 0) {
+			struct device *dev = &pdev->dev;
+			resource_size_t size = resource_size(res);
+			void __iomem *dest;
+
+			if (!devm_request_mem_region(dev,
+						     res->start,
+						     size,
+						     dev_name(dev))) {
+				dev_err(dev,
+					"can't request region for resource %pR\n",
+					res);
+				return IOMEM_ERR_PTR(-EBUSY);
+			}
+
+			dest = devm_ioremap(dev, res->start, size);
+			if (!dest) {
+				dev_err(dev,
+					"ioremap failed for resource %pR\n",
+					res);
+				devm_release_mem_region(dev, res->start, size);
+				dest = IOMEM_ERR_PTR(-ENOMEM);
+			}
+
+			return dest;
+		}
+	}
+	return IOMEM_ERR_PTR(-EINVAL);
 }
 EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource);
 #endif /* CONFIG_HAS_IOMEM */
--
2.22.0