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authorAlex Williamson <alex.williamson@redhat.com>2012-12-07 13:43:51 -0700
committerAlex Williamson <alex.williamson@redhat.com>2012-12-07 13:43:51 -0700
commit9a92c5091a42c565ede818fdf204c4f60004d0d8 (patch)
tree2b6d75e83a08b892c3500b09855feeaecc9d9f60 /drivers/vfio
parent05bf3aac930752408bf38a3f070061fc5f1b9c73 (diff)
downloadlinux-9a92c5091a42c565ede818fdf204c4f60004d0d8.tar.gz
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 <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/vfio')
-rw-r--r--drivers/vfio/pci/vfio_pci.c23
1 files changed, 10 insertions, 13 deletions
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 306b90cf051..b28e66c4376 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)