From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755405Ab1GMPUN (ORCPT ); Wed, 13 Jul 2011 11:20:13 -0400 Received: from mx1.redhat.com ([209.132.183.28]:20727 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755127Ab1GMPUL (ORCPT ); Wed, 13 Jul 2011 11:20:11 -0400 Message-ID: <4E1DB7A5.7040708@redhat.com> Date: Wed, 13 Jul 2011 17:20:05 +0200 From: Jerome Marchand User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.4pre) Gecko/20091014 Fedora/3.0-2.8.b4.fc11 Thunderbird/3.0b4 MIME-Version: 1.0 To: Greg Kroah-Hartman CC: Linux Kernel Mailing List , Nitin Gupta Subject: [PATCH] Staging: zram: Fix kunmapping order Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch fixes the unmapping order of KM_USER0/1 in handle_uncompressed_page() and zram_read() so that kmap()/kunmap() calls are correctly nested. Reported-by: Nitin Gupta Signed-off-by: Jerome Marchand --- zram_drv.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c index c5fdc55..d70ec1a 100644 --- a/drivers/staging/zram/zram_drv.c +++ b/drivers/staging/zram/zram_drv.c @@ -199,8 +199,8 @@ static void handle_uncompressed_page(struct zram *zram, struct bio_vec *bvec, cmem = kmap_atomic(zram->table[index].page, KM_USER1); memcpy(user_mem + bvec->bv_offset, cmem + offset, bvec->bv_len); - kunmap_atomic(user_mem, KM_USER0); kunmap_atomic(cmem, KM_USER1); + kunmap_atomic(user_mem, KM_USER0); flush_dcache_page(page); } @@ -267,8 +267,8 @@ static int zram_bvec_read(struct zram *zram, struct bio_vec *bvec, kfree(uncmem); } - kunmap_atomic(user_mem, KM_USER0); kunmap_atomic(cmem, KM_USER1); + kunmap_atomic(user_mem, KM_USER0); /* Should NEVER happen. Return bio error if it does. */ if (unlikely(ret != LZO_E_OK)) {