From 00548ecff548108ebd7a72fd55d135c70f8417e7 Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Mon, 29 Feb 2016 23:49:47 +0100 Subject: iommu/vt-d: Use BUS_NOTIFY_REMOVED_DEVICE in hotplug path commit e6a8c9b337eed56eb481e1b4dd2180c25a1e5310 upstream. In the PCI hotplug path of the Intel IOMMU driver, replace the usage of the BUS_NOTIFY_DEL_DEVICE notifier, which is executed before the driver is unbound from the device, with BUS_NOTIFY_REMOVED_DEVICE, which runs after that. This fixes a kernel BUG being triggered in the VT-d code when the device driver tries to unmap DMA buffers and the VT-d driver already destroyed all mappings. Reported-by: Stefani Seibold Signed-off-by: Joerg Roedel Signed-off-by: Greg Kroah-Hartman --- drivers/iommu/dmar.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'drivers/iommu/dmar.c') diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c index 55a19e49205b..3821c4786662 100644 --- a/drivers/iommu/dmar.c +++ b/drivers/iommu/dmar.c @@ -329,7 +329,8 @@ static int dmar_pci_bus_notifier(struct notifier_block *nb, /* Only care about add/remove events for physical functions */ if (pdev->is_virtfn) return NOTIFY_DONE; - if (action != BUS_NOTIFY_ADD_DEVICE && action != BUS_NOTIFY_DEL_DEVICE) + if (action != BUS_NOTIFY_ADD_DEVICE && + action != BUS_NOTIFY_REMOVED_DEVICE) return NOTIFY_DONE; info = dmar_alloc_pci_notify_info(pdev, action); @@ -339,7 +340,7 @@ static int dmar_pci_bus_notifier(struct notifier_block *nb, down_write(&dmar_global_lock); if (action == BUS_NOTIFY_ADD_DEVICE) dmar_pci_bus_add_dev(info); - else if (action == BUS_NOTIFY_DEL_DEVICE) + else if (action == BUS_NOTIFY_REMOVED_DEVICE) dmar_pci_bus_del_dev(info); up_write(&dmar_global_lock); -- cgit v1.2.3