[PATCH 20.11 5/5] common/mlx5: fix error handling in multi-class probe

[Michael Baum]

[ upstream commit 8928997a1388ba1b045a55732acced4baf00b21d ]

The common drivers_probe function calls in a loop to all probe functions
for classes requested by the user. After it manages to probe them all,
it updates this on the device in the "classes_loaded" field.

If one of them fails, all those probed to it are remove using the
drivers_remove function. However, this function only releases the
classes in the "classes_loaded" field on the given device and misses the
newly probed classes.

This patch removes the condition from the release function, and ensures
that the caller function sends a more accurate parameter.

Fixes: 8a41f4deccc3 ("common/mlx5: introduce layer for multiple class drivers")

Signed-off-by: Michael Baum <michaelba at nvidia.com>
Acked-by: Matan Azrad <matan at nvidia.com>
---
 drivers/common/mlx5/mlx5_common_pci.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/common/mlx5/mlx5_common_pci.c b/drivers/common/mlx5/mlx5_common_pci.c
index 5208972bb6..fa6e89efd3 100644
--- a/drivers/common/mlx5/mlx5_common_pci.c
+++ b/drivers/common/mlx5/mlx5_common_pci.c
@@ -203,7 +203,6 @@ drivers_remove(struct mlx5_pci_device *dev, uint32_t enabled_classes)
 	unsigned int i = 0;
 	int ret = 0;
 
-	enabled_classes &= dev->classes_loaded;
 	while (enabled_classes) {
 		driver = driver_get(RTE_BIT64(i));
 		if (driver) {
@@ -254,9 +253,11 @@ drivers_probe(struct mlx5_pci_device *dev, struct rte_pci_driver *pci_drv,
 	dev->classes_loaded |= enabled_classes;
 	return 0;
 probe_err:
-	/* Only unload drivers which are enabled which were enabled
-	 * in this probe instance.
+	/*
+	 * Need to remove only drivers which were not probed before this probe
+	 * instance, but have already been probed before this failure.
 	 */
+	enabled_classes &= ~dev->classes_loaded;
 	drivers_remove(dev, enabled_classes);
 	return ret;
 }
-- 
2.25.1