[PATCH v2 4/4] vfio_pci: spapr: Enable VFIO if EEH is not supported

[Alexey Kardashevskiy <aik@ozlabs.ru>]

The existing vfio_pci_open() fails if there is no EEH support for PCI.
This breaks POWER7's P5IOC2 PHB support which this patch brings back.

It is a warning because this should not normally happen on supported
configurations such as POWER8+IODA so we always want to see it in dmesg.
It is _once() as the message may be triggered by non-privileged userspace
and we do not want to pollute dmesg.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---
Changes:
v2:
* discussed with Ben Herrenschmidt and did s/pr_warn/pr_warn_once/
* updated commit log
---
 drivers/vfio/pci/vfio_pci.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index e2ee80f..68dc8da 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -179,10 +179,8 @@ static int vfio_pci_open(void *device_data)
 			goto error;
 
 		ret = vfio_spapr_pci_eeh_open(vdev->pdev);
-		if (ret) {
-			vfio_pci_disable(vdev);
-			goto error;
-		}
+		if (ret)
+			pr_warn_once("EEH is not supported\n");
 	}
 
 	return 0;
-- 
2.0.0