Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757406Ab3ETQHW (ORCPT ); Mon, 20 May 2013 12:07:22 -0400 Received: from webmail.solarflare.com ([12.187.104.25]:19183 "EHLO webmail.solarflare.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755788Ab3ETQHT (ORCPT ); Mon, 20 May 2013 12:07:19 -0400 Message-ID: <1369066035.4616.6.camel@bwh-desktop.uk.solarflarecom.com> Subject: Re: [PATCH v2 6/7] PCI: Make sure VF's driver get attached after PF's From: Ben Hutchings To: Or Gerlitz CC: Greg Rose , Yinghai Lu , Bjorn Helgaas , Gu Zheng , , , Alexander Duyck , Yan Burman , Sathya Perla , Date: Mon, 20 May 2013 17:07:15 +0100 In-Reply-To: References: <1368586102-17661-1-git-send-email-yinghai@kernel.org> <20130515091248.00002fe3@unknown> Organization: Solarflare Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3 (3.2.3-3.fc16) Content-Transfer-Encoding: 7bit MIME-Version: 1.0 X-Originating-IP: [10.17.20.137] X-TM-AS-Product-Ver: SMEX-10.0.0.1412-7.000.1014-19878.004 X-TM-AS-Result: No--21.917800-0.000000-31 X-TM-AS-User-Approved-Sender: Yes X-TM-AS-User-Blocked-Sender: No Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1554 Lines: 37 On Mon, 2013-05-20 at 15:28 +0300, Or Gerlitz wrote: > On Wed, May 15, 2013 at 7:12 PM, Greg Rose wrote: > > > > I'm really not a fan of this. Seems to me the tail is wagging the dog > > here. Fix the driver to work without a PF driver being present. > > Greg, Alex, > > As I wrote over the V1 thread, currently we can't go and patch mlx4 to > use the sysfs API nor defer the call from within our probe function to > enable sriov since this requires some firmware change to allow > enabling SRIOV after some resources are initialized/provisioned. > Hence the patch suggested here or any other patch we can agree on > which will make sure that VF probing is done only once the PF is ready > is preferred, I think. > > I wasn't sure to totally follow on the argument that things need to > work when the PF is absent in the sense there's no driver instance > around over which the PF is probed, if you can explain little better, > that would help. It might be sufficient to return -EPROBE_DEFER from the VF probe function when the PF is not yet ready, if you can easily detect that. Ben. -- Ben Hutchings, Staff Engineer, Solarflare Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked. -- 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/