[dpdk-dev] [PATCH] bus/pci: fix vfio device reset

[Jerin Jacob <jerin.jacob@caviumnetworks.com>]

If the device is not capable of resetting, then Linux kernel updates
the errno as EINVAL.
http://elixir.free-electrons.com/linux/v4.9/source/drivers/vfio/pci/vfio_pci.c#L887

Honor the EINVAL errno value to avoid pci vfio setup failure.

Fixes: f25f8f367644 ("bus/pci: check VFIO reset ioctl error")

Cc: Jonas Pfefferle <jpf@zurich.ibm.com>
Cc: Anatoly Burakov <anatoly.burakov@intel.com>

Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
---
 drivers/bus/pci/linux/pci_vfio.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/bus/pci/linux/pci_vfio.c b/drivers/bus/pci/linux/pci_vfio.c
index 360eed380..11df64846 100644
--- a/drivers/bus/pci/linux/pci_vfio.c
+++ b/drivers/bus/pci/linux/pci_vfio.c
@@ -338,8 +338,11 @@ pci_vfio_setup_device(struct rte_pci_device *dev, int vfio_dev_fd)
 		return -1;
 	}
 
-	/* Reset the device */
-	if (ioctl(vfio_dev_fd, VFIO_DEVICE_RESET)) {
+	/*
+	 * Reset the device. If the device is not capable of resetting,
+	 * then it updates errno as EINVAL.
+	 */
+	if (ioctl(vfio_dev_fd, VFIO_DEVICE_RESET) && errno != EINVAL) {
 		RTE_LOG(ERR, EAL, "Unable to reset device! Error: %d (%s)\n",
 				errno, strerror(errno));
 		return -1;
-- 
2.14.3