From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga01.intel.com ([192.55.52.88]:9915 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755063AbdBGTX7 (ORCPT ); Tue, 7 Feb 2017 14:23:59 -0500 From: Keith Busch To: linux-pci@vger.kernel.org, Bjorn Helgaas Cc: Greg Kroah-Hartman , Lukas Wunner , Wei Zhang , Austin Bolen , Christoph Hellwig , Keith Busch Subject: [PATCHv6 4/5] pci/msix: Skip disabling disconnected devices Date: Tue, 7 Feb 2017 14:32:36 -0500 Message-Id: <1486495957-26177-5-git-send-email-keith.busch@intel.com> In-Reply-To: <1486495957-26177-1-git-send-email-keith.busch@intel.com> References: <1486495957-26177-1-git-send-email-keith.busch@intel.com> Sender: linux-pci-owner@vger.kernel.org List-ID: This patch checks the device connected state prior to executing device shutdown operations or writing msi messages so that tear down on disconnected devices completes quicker. Signed-off-by: Keith Busch Reviewed-by: Christoph Hellwig --- drivers/pci/msi.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index 50c5003..17807eb3 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -317,7 +317,7 @@ void __pci_write_msi_msg(struct msi_desc *entry, struct msi_msg *msg) { struct pci_dev *dev = msi_desc_to_pci_dev(entry); - if (dev->current_state != PCI_D0) { + if (dev->current_state != PCI_D0 || pci_dev_is_disconnected(dev)) { /* Don't touch the hardware now */ } else if (entry->msi_attrib.is_msix) { void __iomem *base = pci_msix_desc_addr(entry); @@ -1020,6 +1020,11 @@ void pci_msix_shutdown(struct pci_dev *dev) if (!pci_msi_enable || !dev || !dev->msix_enabled) return; + if (pci_dev_is_disconnected(dev)) { + dev->msix_enabled = 0; + return; + } + /* Return the device with MSI-X masked as initial states */ for_each_pci_msi_entry(entry, dev) { /* Keep cached states to be restored */ -- 2.7.2