From 3d74a539ae07a8f3c061332e426fc07b2310cf05 Mon Sep 17 00:00:00 2001 From: Konrad Rzeszutek Wilk Date: Thu, 17 Feb 2011 16:12:51 -0500 Subject: [PATCH] pci/xen: When free-ing MSI-X/MSI irq->desc also use generic code. This code path is only run when an MSI/MSI-X PCI device is passed in to PV DomU. In 2.6.37 time-frame we over-wrote the default cleanup handler for MSI/MSI-X irq->desc to be "xen_teardown_msi_irqs". That function calls the the xen-pcifront driver which can tell the backend to cleanup/take back the MSI/MSI-X device. However, we forgot to continue the process of free-ing the MSI/MSI-X device resources (irq->desc) in the PV domU side. Which is what the default cleanup handler: default_teardown_msi_irqs did. Hence we would leak IRQ descriptors. Without this patch, doing "rmmod igbvf;modprobe igbvf" multiple times ends with abandoned IRQ descriptors: 28: 5 xen-pirq-pcifront-msi-x 29: 8 xen-pirq-pcifront-msi-x ... 130: 10 xen-pirq-pcifront-msi-x with the end result of running out of IRQ descriptors. Reviewed-by: Ian Campbell Signed-off-by: Konrad Rzeszutek Wilk --- arch/x86/pci/xen.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c index 30fdd09dea05..57afd1da491d 100644 --- a/arch/x86/pci/xen.c +++ b/arch/x86/pci/xen.c @@ -193,6 +193,9 @@ static void xen_teardown_msi_irqs(struct pci_dev *dev) xen_pci_frontend_disable_msix(dev); else xen_pci_frontend_disable_msi(dev); + + /* Free the IRQ's and the msidesc using the generic code. */ + default_teardown_msi_irqs(dev); } static void xen_teardown_msi_irq(unsigned int irq)