linux-kernel - [PATCH] Fix kunmap() argument in sg_miter

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Date:	Sat, 15 Nov 2008 11:27:51 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	linux-kernel@...r.kernel.org
Cc:	htejun@...il.com, akpm@...ux-foundation.org, jens.axboe@...cle.com
Subject: [PATCH] Fix kunmap() argument in sg_miter_stop


>From fd5530ac75a919a20bf7951e90a2b12323e9c0a0 Mon Sep 17 00:00:00 2001
From: Arjan van de Ven <arjan@...ux.intel.com>
Date: Sat, 15 Nov 2008 11:23:58 -0800
Subject: [PATCH] Fix kunmap() argument in sg_miter_stop

kunmap() takes as argument the struct page that orginally got kmap()'d,
however the sg_miter_stop() function passed it the kernel virtual address
instead, resulting in "kernel BUG at arch/x86/mm/highmem_32.c:115!"

This is moderately popular on kerneloops.org, mostly in interaction with the MMC layer.

Reported-by: kerneloops.org
CC: htejun@...il.com
CC: stable@...nel.org

Signed-off-by: Arjan van de Ven <arjan@...ux.intel.com>
---
 lib/scatterlist.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index 8d2688f..b7b449d 100644
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -395,7 +395,7 @@ void sg_miter_stop(struct sg_mapping_iter *miter)
 			WARN_ON(!irqs_disabled());
 			kunmap_atomic(miter->addr, KM_BIO_SRC_IRQ);
 		} else
-			kunmap(miter->addr);
+			kunmap(miter->page);
 
 		miter->page = NULL;
 		miter->addr = NULL;
-- 
1.6.0.3


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
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