From 75058a302bfa80ff59bf5b25ddb987683a4da650 Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Wed, 30 Jul 2014 16:04:39 +0200 Subject: [PATCH] iommu/amd: Fix device_state reference counting The references to the device state are not dropped everywhere. This might cause a dead-lock in amd_iommu_free_device(). Fix it. Signed-off-by: Joerg Roedel Tested-by: Oded Gabbay --- drivers/iommu/amd_iommu_v2.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/iommu/amd_iommu_v2.c b/drivers/iommu/amd_iommu_v2.c index 524fd67a85b1..2de13be17268 100644 --- a/drivers/iommu/amd_iommu_v2.c +++ b/drivers/iommu/amd_iommu_v2.c @@ -368,6 +368,9 @@ static void free_pasid_states(struct device_state *dev_state) put_pasid_state_wait(pasid_state); /* Reference taken in amd_iommu_pasid_bind */ + + /* Drop reference taken in amd_iommu_bind_pasid */ + put_device_state(dev_state); } if (dev_state->pasid_levels == 2) @@ -748,6 +751,10 @@ void amd_iommu_unbind_pasid(struct pci_dev *pdev, int pasid) put_pasid_state_wait(pasid_state); /* Reference taken in amd_iommu_pasid_bind */ out: + /* Drop reference taken in this function */ + put_device_state(dev_state); + + /* Drop reference taken in amd_iommu_bind_pasid */ put_device_state(dev_state); } EXPORT_SYMBOL(amd_iommu_unbind_pasid); -- 2.34.1