linux-kernel - [PATCH v3] mtd: plat-ram: Replace manual resource management by devm

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-Id: <1503408251-6931-1-git-send-email-vasilyev@ispras.ru>
Date:   Tue, 22 Aug 2017 16:24:11 +0300
From:   Anton Vasilyev <vasilyev@...ras.ru>
To:     Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:     Anton Vasilyev <vasilyev@...ras.ru>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        ldv-project@...uxtesting.org
Subject: [PATCH v3] mtd: plat-ram: Replace manual resource management by devm

Driver contains unsuitable request_mem_region() and
release_resource() calls.

The patch switches manual resource management by devm interface for
readability and error-free simplification.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Anton Vasilyev <vasilyev@...ras.ru>
Suggested-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
---
v1: Fix commit based on Boris Brezillon review
---
v2: Change commit by Boris Brezillon solution
---
v3: Change description with title
---
 drivers/mtd/maps/plat-ram.c | 38 ++++----------------------------------
 1 file changed, 4 insertions(+), 34 deletions(-)

diff --git a/drivers/mtd/maps/plat-ram.c b/drivers/mtd/maps/plat-ram.c
index 5157289..6d9a4d6 100644
--- a/drivers/mtd/maps/plat-ram.c
+++ b/drivers/mtd/maps/plat-ram.c
@@ -43,7 +43,6 @@ struct platram_info {
 	struct device		*dev;
 	struct mtd_info		*mtd;
 	struct map_info		 map;
-	struct resource		*area;
 	struct platdata_mtd_ram	*pdata;
 };
 
@@ -97,16 +96,6 @@ static int platram_remove(struct platform_device *pdev)
 
 	platram_setrw(info, PLATRAM_RO);
 
-	/* release resources */
-
-	if (info->area) {
-		release_resource(info->area);
-		kfree(info->area);
-	}
-
-	if (info->map.virt != NULL)
-		iounmap(info->map.virt);
-
 	kfree(info);
 
 	return 0;
@@ -147,12 +136,11 @@ static int platram_probe(struct platform_device *pdev)
 	info->pdata = pdata;
 
 	/* get the resource for the memory mapping */
-
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-
-	if (res == NULL) {
-		dev_err(&pdev->dev, "no memory resource specified\n");
-		err = -ENOENT;
+	info->map.virt = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(info->map.virt)) {
+		err = PTR_ERR(info->map.virt);
+		dev_err(&pdev->dev, "failed to ioremap() region\n");
 		goto exit_free;
 	}
 
@@ -167,26 +155,8 @@ static int platram_probe(struct platform_device *pdev)
 			(char *)pdata->mapname : (char *)pdev->name;
 	info->map.bankwidth = pdata->bankwidth;
 
-	/* register our usage of the memory area */
-
-	info->area = request_mem_region(res->start, info->map.size, pdev->name);
-	if (info->area == NULL) {
-		dev_err(&pdev->dev, "failed to request memory region\n");
-		err = -EIO;
-		goto exit_free;
-	}
-
-	/* remap the memory area */
-
-	info->map.virt = ioremap(res->start, info->map.size);
 	dev_dbg(&pdev->dev, "virt %p, %lu bytes\n", info->map.virt, info->map.size);
 
-	if (info->map.virt == NULL) {
-		dev_err(&pdev->dev, "failed to ioremap() region\n");
-		err = -EIO;
-		goto exit_free;
-	}
-
 	simple_map_init(&info->map);
 
 	dev_dbg(&pdev->dev, "initialised map, probing for mtd\n");
-- 
2.7.4