Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757356Ab3D2K0m (ORCPT ); Mon, 29 Apr 2013 06:26:42 -0400 Received: from smtp.nue.novell.com ([195.135.221.5]:41817 "EHLO smtp.nue.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751700Ab3D2K0l (ORCPT ); Mon, 29 Apr 2013 06:26:41 -0400 Subject: Re: [PATCH] x86, efi: initial the local variable of DataSize to zero From: joeyli To: matt.fleming@intel.com, mjg59@srcf.ucam.org Cc: linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, Matthew Garrett , "H. Peter Anvin" In-Reply-To: <1366996767-8234-1-git-send-email-jlee@suse.com> References: <1366996767-8234-1-git-send-email-jlee@suse.com> Content-Type: text/plain; charset="UTF-8" Date: Mon, 29 Apr 2013 18:25:11 +0800 Message-ID: <1367231111.22858.55.camel@linux-s257.site> Mime-Version: 1.0 X-Mailer: Evolution 2.28.2 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2311 Lines: 72 於 六，2013-04-27 於 01:19 +0800，Lee, Chun-Yi 提到： > That will be better initial the value of DataSize to zero for the input of > GetVariable(), otherwise we will feed a random value. The debug log of input > DataSize like this: > > ... > [ 195.915612] EFI Variables Facility v0.08 2004-May-17 > [ 195.915819] efi: size: 18446744071581821342 > [ 195.915969] efi: size': 18446744071581821342 > [ 195.916324] efi: size: 18446612150714306560 > [ 195.916632] efi: size': 18446612150714306560 > [ 195.917159] efi: size: 18446612150714306560 > [ 195.917453] efi: size': 18446612150714306560 > ... After applied patch, the log of size like this: [ 82.442042] EFI Variables Facility v0.08 2004-May-17 [ 82.442202] efi: size: 0 [ 82.442360] efi: size': 1039 [ 82.443828] efi: size: 0 [ 82.444127] efi: size': 2616 [ 82.447057] efi: size: 0 [ 82.447356] efi: size': 5832 [ 82.452669] efi: size: 0 [ 82.453128] efi: size': 1 [ 82.454339] efi: size: 0 [ 82.454843] efi: size': 1 [ 82.456173] efi: size: 0 [ 82.456764] efi: size': 8 [ 82.458194] efi: size: 0 [ 82.458905] efi: size': 4 The size' is the return value of Acer BIOS, it return right size value then we feed zero DataSize. Thanks a lot! Joey Lee > > Found on Acer Aspire V3 BIOS, it will not return the size of data if we input a > non-zero DataSize. > > Cc: Matthew Garrett > Cc: Matt Fleming > Cc: H. Peter Anvin > Signed-off-by: Lee, Chun-Yi > --- > arch/x86/platform/efi/efi.c | 2 +- > 1 files changed, 1 insertions(+), 1 deletions(-) > > diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c > index e4a86a6..cb59732 100644 > --- a/arch/x86/platform/efi/efi.c > +++ b/arch/x86/platform/efi/efi.c > @@ -204,7 +204,7 @@ static efi_status_t virt_efi_get_next_variable(unsigned long *name_size, > } > > if (boot_used_size && !finished) { > - unsigned long size; > + unsigned long size = 0; > u32 attr; > efi_status_t s; > void *tmp; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/