linux-kernel - [PATCH v8 01/10] mtd: physmap_of: Release resources on error

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Date:   Thu,  4 Oct 2018 15:31:46 +0200
From:   Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To:     David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Zhouyang Jia <jiazhouyang09@...il.com>,
        linux-mtd@...ts.infradead.org,
        open list <linux-kernel@...r.kernel.org>
Cc:     Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Subject: [PATCH v8 01/10] mtd: physmap_of: Release resources on error

During probe, if there was an error the memory region and the memory
map were not properly released.This can lead a system unusable if
deferred probe is in use.

Replace mem_request and map with devm_ioremap_resource

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
---
 drivers/mtd/maps/physmap_of_core.c | 27 +++++----------------------
 1 file changed, 5 insertions(+), 22 deletions(-)

diff --git a/drivers/mtd/maps/physmap_of_core.c b/drivers/mtd/maps/physmap_of_core.c
index 4129535b8e46..ed75f1781c37 100644
--- a/drivers/mtd/maps/physmap_of_core.c
+++ b/drivers/mtd/maps/physmap_of_core.c
@@ -31,7 +31,6 @@
 struct of_flash_list {
 	struct mtd_info *mtd;
 	struct map_info map;
-	struct resource *res;
 };
 
 struct of_flash {
@@ -56,18 +55,10 @@ static int of_flash_remove(struct platform_device *dev)
 			mtd_concat_destroy(info->cmtd);
 	}
 
-	for (i = 0; i < info->list_size; i++) {
+	for (i = 0; i < info->list_size; i++)
 		if (info->list[i].mtd)
 			map_destroy(info->list[i].mtd);
 
-		if (info->list[i].map.virt)
-			iounmap(info->list[i].map.virt);
-
-		if (info->list[i].res) {
-			release_resource(info->list[i].res);
-			kfree(info->list[i].res);
-		}
-	}
 	return 0;
 }
 
@@ -215,10 +206,11 @@ static int of_flash_probe(struct platform_device *dev)
 
 		err = -EBUSY;
 		res_size = resource_size(&res);
-		info->list[i].res = request_mem_region(res.start, res_size,
-						       dev_name(&dev->dev));
-		if (!info->list[i].res)
+		info->list[i].map.virt = devm_ioremap_resource(&dev->dev, &res);
+		if (IS_ERR(info->list[i].map.virt)){
+			err = PTR_ERR(info->list[i].map.virt);
 			goto err_out;
+		}
 
 		err = -ENXIO;
 		width = of_get_property(dp, "bank-width", NULL);
@@ -246,15 +238,6 @@ static int of_flash_probe(struct platform_device *dev)
 		if (err)
 			goto err_out;
 
-		err = -ENOMEM;
-		info->list[i].map.virt = ioremap(info->list[i].map.phys,
-						 info->list[i].map.size);
-		if (!info->list[i].map.virt) {
-			dev_err(&dev->dev, "Failed to ioremap() flash"
-				" region\n");
-			goto err_out;
-		}
-
 		simple_map_init(&info->list[i].map);
 
 		/*
-- 
2.19.0