From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexander Gordeev Subject: [PATCH 3/3] AHCI: Use pci_enable_msi_partial() to conserve on 10/16 MSIs Date: Tue, 10 Jun 2014 15:10:32 +0200 Message-ID: References: Return-path: Received: from mx1.redhat.com ([209.132.183.28]:49403 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750937AbaFJNJb (ORCPT ); Tue, 10 Jun 2014 09:09:31 -0400 In-Reply-To: Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: linux-kernel@vger.kernel.org Cc: Alexander Gordeev , x86@kernel.org, xen-devel@lists.xenproject.org, iommu@lists.linux-foundation.org, linux-ide@vger.kernel.org, linux-pci@vger.kernel.org Make use of the new pci_enable_msi_partial() interface and conserve on othewise wasted interrupt resources for 10 out of 16 unused MSI vectors on Intel chipsets. Cc: x86@kernel.org Cc: xen-devel@lists.xenproject.org Cc: iommu@lists.linux-foundation.org Cc: linux-ide@vger.kernel.org Cc: linux-pci@vger.kernel.org Signed-off-by: Alexander Gordeev --- drivers/ata/ahci.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c index 6070781..0c7a0f3 100644 --- a/drivers/ata/ahci.c +++ b/drivers/ata/ahci.c @@ -1194,7 +1194,7 @@ static int ahci_init_interrupts(struct pci_dev *pdev, unsigned int n_ports, if (nvec < n_ports) goto single_msi; - rc = pci_enable_msi_exact(pdev, nvec); + rc = pci_enable_msi_partial(pdev, n_ports, nvec); if (rc == -ENOSPC) goto single_msi; else if (rc < 0) @@ -1207,7 +1207,7 @@ static int ahci_init_interrupts(struct pci_dev *pdev, unsigned int n_ports, goto single_msi; } - return nvec; + return n_ports; single_msi: if (pci_enable_msi(pdev)) -- 1.7.7.6