From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1033727AbeCARsz (ORCPT ); Thu, 1 Mar 2018 12:48:55 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:51884 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1033541AbeCARsu (ORCPT ); Thu, 1 Mar 2018 12:48:50 -0500 Date: Thu, 1 Mar 2018 09:48:45 -0800 From: Darren Hart To: Mario Limonciello Cc: Andy Shevchenko , pali.rohar@gmail.com, LKML , platform-driver-x86@vger.kernel.org Subject: Re: [PATCH v3 3/3] platform/x86: dell-smbios: Link all dell-smbios-* modules together Message-ID: <20180301174845.GA25613@fury> References: <1519755784-2155-1-git-send-email-mario.limonciello@dell.com> <1519755784-2155-3-git-send-email-mario.limonciello@dell.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1519755784-2155-3-git-send-email-mario.limonciello@dell.com> User-Agent: Mutt/1.9.1 (2017-09-22) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Feb 27, 2018 at 12:23:04PM -0600, Mario Limonciello wrote: > Some race conditions were raised due to dell-smbios and its backends > not being ready by the time that a consumer would call one of the > exported methods. > > To avoid this problem, guarantee that all initialization has been > done by linking them all together and running init for them all. > > As part of this change the Kconfig needs to be adjusted so that > CONFIG_DELL_SMBIOS_SMM and CONFIG_DELL_SMBIOS_WMI are boolean > rather than modules. > > CONFIG_DELL_SMBIOS is a visually selectable option again and both > CONFIG_DELL_SMBIOS_WMI and CONFIG_DELL_SMBIOS_SMM are optional. > > Signed-off-by: Mario Limonciello > --- > Changes from v2: > * Move rest of #ifdef out of source files > * Only compile units as necessary > > drivers/platform/x86/Kconfig | 11 ++++++++--- > drivers/platform/x86/Makefile | 4 ++-- > drivers/platform/x86/dell-smbios-base.c | 21 ++++++++++++++++++++- > drivers/platform/x86/dell-smbios-smm.c | 18 ++++-------------- > drivers/platform/x86/dell-smbios-wmi.c | 14 ++++---------- > drivers/platform/x86/dell-smbios.h | 27 ++++++++++++++++++++++++++- > 6 files changed, 64 insertions(+), 31 deletions(-) > > diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig > index 9a8f964..0c0897e 100644 > --- a/drivers/platform/x86/Kconfig > +++ b/drivers/platform/x86/Kconfig > @@ -106,10 +106,15 @@ config ASUS_LAPTOP > If you have an ACPI-compatible ASUS laptop, say Y or M here. > > config DELL_SMBIOS > - tristate > + tristate "Dell SMBIOS driver" > + ---help--- > + This provides support for the Dell SMBIOS calling interface. > + If you have a Dell computer you should enable this option. > + > + Be sure to select at least one backend for it to work properly. In order to make the default sane, I would suggest making the above a menu (default n), nesting the two options below, and making WMI a default=y. This satisfies Linus' requirement by defaulting everything to n, but enables a sane default IFF the DELL_SMBIOS menu is enabled. Alternatively, all of the above can be put under the "Dell Extras" menu I proposed, and DELL_SMBIOS can default to m and DELL_SMBIOS_WMI can default to y. > > + /* register backends */ > + wmi = init_dell_smbios_wmi(); > + if (wmi) > + pr_debug("Failed to initialize WMI backend: %d\n", wmi); > + smm = init_dell_smbios_smm(); > + if (smm) > + pr_debug("Failed to initialize SMM backend: %d\n", smm); > + if (wmi && smm) { > + pr_err("No SMBIOS backends available (wmi: %d, smm: %d)\n", > + wmi, smm); > + goto fail_sysfs; > + } > + I like the approach of building a library instead of a bunch of separate modules. -- Darren Hart VMware Open Source Technology Center