From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joerg Roedel Subject: [PATCH 3/4] iommu/amd: Fix device_state reference counting Date: Wed, 30 Jul 2014 16:04:39 +0200 Message-ID: <1406729080-2486-3-git-send-email-joro@8bytes.org> References: <1406729080-2486-1-git-send-email-joro@8bytes.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1406729080-2486-1-git-send-email-joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Cc: Joerg Roedel List-Id: iommu@lists.linux-foundation.org From: Joerg Roedel 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 524fd67..2de13be 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); -- 1.9.1