Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754521AbaDRT45 (ORCPT ); Fri, 18 Apr 2014 15:56:57 -0400 Received: from mail-qc0-f182.google.com ([209.85.216.182]:64861 "EHLO mail-qc0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754022AbaDRT4y (ORCPT ); Fri, 18 Apr 2014 15:56:54 -0400 Date: Fri, 18 Apr 2014 15:56:50 -0400 From: Tejun Heo To: Alexander Gordeev Cc: linux-kernel@vger.kernel.org, David Milburn , linux-ide@vger.kernel.org Subject: Re: [PATCH 1/1] ahci: Do not receive interrupts sent by dummy ports Message-ID: <20140418195650.GJ23576@htj.dyndns.org> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Apr 17, 2014 at 06:06:15PM +0200, Alexander Gordeev wrote: > In multiple MSI mode all AHCI ports (including dummy) get > assigned separate MSI vectors and (as result of execution > pci_enable_msi_exact() function) separate IRQ numbers, > (mapped to the MSI vectors). > > Therefore, although interrupts from dummy ports are not > desired they are still enabled. We do not request IRQs > for dummy ports, but that only means we do not assign > AHCI-specific ISRs to corresponding IRQ numbers. > > As result, dummy port interrupts still could come and > traverse all the way from the PCI device to the kernel, > causing unnecessary overhead. > > This update disables IRQs for dummy ports and prevents > the described issue. > > Signed-off-by: Alexander Gordeev > Cc: Tejun Heo > Cc: David Milburn > Cc: linux-ide@vger.kernel.org Applied to libata/for-3.15-fixes w/ David's tested-by added. Thanks. -- tejun -- 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/