[RFC 2/4] vdpa/mlx5: fix check on err interrupt FD

[David Marchand <david.marchand@redhat.com>]

A 0 file descriptor is valid.
Prefer setting to -1 to indicate an invalid FD.

Fixes: 0474419bae7c ("vdpa/mlx5: handle hardware error")

Signed-off-by: David Marchand <david.marchand@redhat.com>
---
 drivers/vdpa/mlx5/mlx5_vdpa_event.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/vdpa/mlx5/mlx5_vdpa_event.c b/drivers/vdpa/mlx5/mlx5_vdpa_event.c
index 43585a94b2..dee2ccc23d 100644
--- a/drivers/vdpa/mlx5/mlx5_vdpa_event.c
+++ b/drivers/vdpa/mlx5/mlx5_vdpa_event.c
@@ -452,7 +452,7 @@ mlx5_vdpa_err_event_setup(struct mlx5_vdpa_priv *priv)
 					 mlx5_vdpa_err_interrupt_handler,
 					 priv);
 	if (ret != 0) {
-		rte_intr_fd_set(priv->err_intr_handle, 0);
+		rte_intr_fd_set(priv->err_intr_handle, -1);
 		DRV_LOG(ERR, "Failed to register error interrupt for device %d.",
 			priv->vid);
 		rte_errno = -ret;
@@ -473,7 +473,7 @@ mlx5_vdpa_err_event_unset(struct mlx5_vdpa_priv *priv)
 	int retries = MLX5_VDPA_INTR_RETRIES;
 	int ret = -EAGAIN;
 
-	if (!rte_intr_fd_get(priv->err_intr_handle))
+	if (rte_intr_fd_get(priv->err_intr_handle) < 0)
 		return;
 	while (retries-- && ret == -EAGAIN) {
 		ret = rte_intr_callback_unregister(priv->err_intr_handle,
@@ -487,6 +487,7 @@ mlx5_vdpa_err_event_unset(struct mlx5_vdpa_priv *priv)
 			rte_pause();
 		}
 	}
+	rte_intr_fd_set(priv->err_intr_handle, -1);
 	if (priv->err_chnl) {
 #ifdef HAVE_IBV_DEVX_EVENT
 		union {
-- 
2.54.0