linux-kernel - [PATCH net v2] net: macb: fix an issue about leak related system resources

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Date:   Wed, 29 Apr 2020 21:56:51 +0800
From:   Dejin Zheng <zhengdejin5@...il.com>
To:     nicolas.ferre@...rochip.com, davem@...emloft.net,
        paul.walmsley@...ive.com, palmer@...belt.com, yash.shah@...ive.com,
        netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Dejin Zheng <zhengdejin5@...il.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: [PATCH net v2] net: macb: fix an issue about leak related system resources

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>
Signed-off-by: Dejin Zheng <zhengdejin5@...il.com>
---
v1 -> v2:
	- Nicolas and Andy suggest use devm_platform_ioremap_resource()
	  to repalce devm_ioremap() to fix this issue. Thanks Nicolas
	  and Andy.
	- Yash help me to review this patch, Thanks Yash!

 drivers/net/ethernet/cadence/macb_main.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index a0e8c5bbabc0..99354e327d1f 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -4172,13 +4172,7 @@ static int fu540_c000_clk_init(struct platform_device *pdev, struct clk **pclk,
 
 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));
+	mgmt->reg = devm_platform_ioremap_resource(pdev, 1);
 	if (!mgmt->reg)
 		return -ENOMEM;
 
-- 
2.25.0