From 9a92c5091a42c565ede818fdf204c4f60004d0d8 Mon Sep 17 00:00:00 2001 From: Alex Williamson Date: Fri, 7 Dec 2012 13:43:51 -0700 Subject: [PATCH] vfio-pci: Enable device before attempting reset Devices making use of PM reset are getting incorrectly identified as not supporting reset because pci_pm_reset() fails unless the device is in D0 power state. When first attached to vfio_pci devices are typically in an unknown power state. We can fix this by explicitly setting the power state or simply calling pci_enable_device() before attempting a pci_reset_function(). We need to enable the device anyway, so move this up in our vfio_pci_enable() function, which also simplifies the error path a bit. Note that pci_disable_device() does not explicitly set the power state, so there's no need to re-order vfio_pci_disable(). Signed-off-by: Alex Williamson --- drivers/vfio/pci/vfio_pci.c | 23 ++++++++++------------- 1 file changed, 10 insertions(+), 13 deletions(-) diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c index 306b90c..b28e66c4 100644 --- a/drivers/vfio/pci/vfio_pci.c +++ b/drivers/vfio/pci/vfio_pci.c @@ -43,6 +43,10 @@ static int vfio_pci_enable(struct vfio_pci_device *vdev) u16 cmd; u8 msix_pos; + ret = pci_enable_device(pdev); + if (ret) + return ret; + vdev->reset_works = (pci_reset_function(pdev) == 0); pci_save_state(pdev); vdev->pci_saved_state = pci_store_saved_state(pdev); @@ -51,8 +55,11 @@ static int vfio_pci_enable(struct vfio_pci_device *vdev) __func__, dev_name(&pdev->dev)); ret = vfio_config_init(vdev); - if (ret) - goto out; + if (ret) { + pci_load_and_free_saved_state(pdev, &vdev->pci_saved_state); + pci_disable_device(pdev); + return ret; + } if (likely(!nointxmask)) vdev->pci_2_3 = pci_intx_mask_supported(pdev); @@ -77,17 +84,7 @@ static int vfio_pci_enable(struct vfio_pci_device *vdev) } else vdev->msix_bar = 0xFF; - ret = pci_enable_device(pdev); - if (ret) - goto out; - - return ret; - -out: - kfree(vdev->pci_saved_state); - vdev->pci_saved_state = NULL; - vfio_config_free(vdev); - return ret; + return 0; } static void vfio_pci_disable(struct vfio_pci_device *vdev) -- 2.7.4