From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Tue, 19 Feb 2013 02:13:51 +0100 From: David =?iso-8859-1?Q?H=E4rdeman?= To: Hannes Reinecke Cc: linux-kernel@vger.kernel.org, Frederik Himpe , Oliver Neukum , linux-usb@vger.kernel.org, linux-pci@vger.kernel.org Subject: Re: [PATCH] pci: do not try to assign irq 255 Message-ID: <20130219011351.GA4756@hardeman.nu> References: <1361182193-31894-1-git-send-email-hare@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 In-Reply-To: <1361182193-31894-1-git-send-email-hare@suse.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: On Mon, Feb 18, 2013 at 11:09:53AM +0100, Hannes Reinecke wrote: >The PCI config space reseves a byte for the interrupt line, >so irq 255 actually refers to 'not set'. >However, the 'irq' field for struct pci_dev is an integer, >so the original meaning is lost, causing the system to >assign an interrupt '255', which fails. > >So we should _not_ assign an interrupt value here, and >allow upper layers to fixup things. > >This patch make PCI devices with MSI interrupts only >(like the xhci device on certain HP laptops) work properly. Just tested and it works for me. Thank you. Tested-by: David Härdeman >Cc: Frederik Himpe >Cc: Oliver Neukum >Cc: David Haerdeman >Cc: linux-usb@vger.kernel.org >Cc: linux-pci@vger.kernel.org >Signed-off-by: Hannes Reinecke > >diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c >index 6186f03..a2db887f 100644 >--- a/drivers/pci/probe.c >+++ b/drivers/pci/probe.c >@@ -923,7 +923,8 @@ static void pci_read_irq(struct pci_dev *dev) > dev->pin = irq; > if (irq) > pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq); >- dev->irq = irq; >+ if (irq < 255) >+ dev->irq = irq; > } > > void set_pcie_port_type(struct pci_dev *pdev) > -- David Härdeman