linux-kernel - [PATCH] devm_memremap_release: fix memremap'd addr handling

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Date:	Tue, 16 Feb 2016 09:30:27 -0700
From:	Toshi Kani <toshi.kani@....com>
To:	dan.j.williams@...el.com, akpm@...ux-foundation.org
Cc:	linux-nvdimm@...ts.01.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Toshi Kani <toshi.kani@....com>
Subject: [PATCH] devm_memremap_release: fix memremap'd addr handling

The pmem driver calls devm_memremap() to map a persistent memory
range.  When the pmem driver is unloaded, this memremap'd range
is not released.

Fix devm_memremap_release() to handle a given memremap'd address
properly.

Signed-off-by: Toshi Kani <toshi.kani@....com>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
---
 kernel/memremap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/memremap.c b/kernel/memremap.c
index 2c468de..7a1b5c3 100644
--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -114,7 +114,7 @@ EXPORT_SYMBOL(memunmap);
 
 static void devm_memremap_release(struct device *dev, void *res)
 {
-	memunmap(res);
+	memunmap(*(void **)res);
 }
 
 static int devm_memremap_match(struct device *dev, void *res, void *match_data)