From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751901AbdHDIbC (ORCPT ); Fri, 4 Aug 2017 04:31:02 -0400 Received: from mail.skyhub.de ([5.9.137.197]:49140 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751284AbdHDIbA (ORCPT ); Fri, 4 Aug 2017 04:31:00 -0400 Date: Fri, 4 Aug 2017 10:30:07 +0200 From: Borislav Petkov To: Toshi Kani Cc: rjw@rjwysocki.net, mchehab@kernel.org, tony.luck@intel.com, lenb@kernel.org, linux-acpi@vger.kernel.org, linux-edac@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 6/7] EDAC: add edac_check_mc_owner() to check MC owner Message-ID: <20170804083007.GA15617@nazgul.tnic> References: <20170803215753.30553-1-toshi.kani@hpe.com> <20170803215753.30553-7-toshi.kani@hpe.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20170803215753.30553-7-toshi.kani@hpe.com> User-Agent: Mutt/1.6.0 (2016-04-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Aug 03, 2017 at 03:57:52PM -0600, Toshi Kani wrote: > Only a single edac driver can be enabled for EDAC MC. When ghes_edac > is enabled, a regular edac driver for the CPU type / platform still > attempts to register itself and fails in edac_mc_add_mc(). > > Add edac_check_mc_owner() so that regular edac drivers can check > the owner of EDAC MC at the beginning of initialization. > > Also change the owner check to string comparison from address check. > > Signed-off-by: Toshi Kani > Cc: Borislav Petkov > Cc: Mauro Carvalho Chehab > Cc: Tony Luck > --- > drivers/edac/edac_mc.c | 15 ++++++++++++++- > drivers/edac/edac_mc.h | 12 ++++++++++++ > 2 files changed, 26 insertions(+), 1 deletion(-) > > diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c > index 4800721..52d8d5e 100644 > --- a/drivers/edac/edac_mc.c > +++ b/drivers/edac/edac_mc.c > @@ -701,6 +701,19 @@ struct mem_ctl_info *edac_mc_find(int idx) > } > EXPORT_SYMBOL(edac_mc_find); > > +/* > + * Returns: > + * 1 when EDAC MC is free or owned by the module name 1 for free OR owned?!? WTF? > + * 0 when EDAC MC is owned by other module > + */ > +int edac_check_mc_owner(const char *mod_name) > +{ > + if (edac_mc_owner && strcmp(edac_mc_owner, mod_name)) strncmp() of course, with sensible maximal string length. > + return 0; > + > + return 1; > +} > +EXPORT_SYMBOL(edac_check_mc_owner); EXPORT_SYMBOL_GPL > > /* FIXME - should a warning be printed if no error detection? correction? */ > int edac_mc_add_mc_with_groups(struct mem_ctl_info *mci, > @@ -742,7 +755,7 @@ int edac_mc_add_mc_with_groups(struct mem_ctl_info *mci, > #endif > mutex_lock(&mem_ctls_mutex); > > - if (edac_mc_owner && edac_mc_owner != mci->mod_name) { > + if (!edac_check_mc_owner(mci->mod_name)) { > ret = -EPERM; > goto fail0; > } > diff --git a/drivers/edac/edac_mc.h b/drivers/edac/edac_mc.h > index 5357800..0e95eba 100644 > --- a/drivers/edac/edac_mc.h > +++ b/drivers/edac/edac_mc.h > @@ -128,6 +128,18 @@ struct mem_ctl_info *edac_mc_alloc(unsigned mc_num, > unsigned sz_pvt); > > /** > + * > + * edac_check_mc_owner - Check the owner of EDAC MC > + * > + * @mod_name: pointer to the module name > + * > + * Returns: > + * 1 when EDAC MC is free or owned by the module name > + * 0 when EDAC MC is owned by other module > + */ Documenting that function only once is enough. > +extern int edac_check_mc_owner(const char *mod_name); > + > +/* > * edac_mc_add_mc_with_groups() - Insert the @mci structure into the mci > * global list and create sysfs entries associated with @mci structure. > * -- Regards/Gruss, Boris. ECO tip #101: Trim your mails when you reply. --