linux-kernel - [PATCH 5.6 024/118] net: macb: fix an issue about leak related system resources

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Date:   Wed, 13 May 2020 11:44:03 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Yash Shah <yash.shah@...ive.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Dejin Zheng <zhengdejin5@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.6 024/118] net: macb: fix an issue about leak related system resources

From: Dejin Zheng <zhengdejin5@...il.com>

[ Upstream commit b959c77dac09348955f344104c6a921ebe104753 ]

A call of the function macb_init() can fail in the function
fu540_c000_init. The related system resources were not released
then. use devm_platform_ioremap_resource() to replace ioremap()
to fix it.

Fixes: c218ad559020ff9 ("macb: Add support for SiFive FU540-C000")
Cc: Andy Shevchenko <andy.shevchenko@...il.com>
Reviewed-by: Yash Shah <yash.shah@...ive.com>
Suggested-by: Nicolas Ferre <nicolas.ferre@...rochip.com>
Suggested-by: Andy Shevchenko <andy.shevchenko@...il.com>
Signed-off-by: Dejin Zheng <zhengdejin5@...il.com>
Acked-by: Nicolas Ferre <nicolas.ferre@...rochip.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/cadence/macb_main.c |   12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -4165,15 +4165,9 @@ static int fu540_c000_clk_init(struct pl
 
 static int fu540_c000_init(struct platform_device *pdev)
 {
-	struct resource *res;
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-	if (!res)
-		return -ENODEV;
-
-	mgmt->reg = ioremap(res->start, resource_size(res));
-	if (!mgmt->reg)
-		return -ENOMEM;
+	mgmt->reg = devm_platform_ioremap_resource(pdev, 1);
+	if (IS_ERR(mgmt->reg))
+		return PTR_ERR(mgmt->reg);
 
 	return macb_init(pdev);
 }