[PATCH v4] net/failsafe: fix probe cleanup

[PATCH v4] net/failsafe: fix probe cleanup

[Raslan Darawsheh]

The hot-plug alarm mechanism is responsible to practically execute both
plug in and out operations. It periodically tries to detect missed
sub-devices to be reconfigured and clean the resources of the removed
sub-devices.

The hot-plug alarm is started by the failsafe probe function, and it's
wrongly not stopped if failsafe instance got an error. for example
when starting failsafe with a MAC option, and giving it an invalid MAC
address this will lead to a NULL pointer for the dev private field. Then
when the hotplug alarm is called it will try to access this pointer,
which will lead to a segmentation fault.

Uninstall the hot-plug alarm in case of error in probe function.

Fixes: ebea83f8 ("net/failsafe: add plug-in support")
Cc: stable@dpdk.org

Signed-off-by: Raslan Darawsheh <rasland@mellanox.com>

---
v2 changes:
 Reword the commit log.

v3 changes:
 Reword the commit log.

v4 changes:
 Fix the fixes commit sha and title.
---
---
 drivers/net/failsafe/failsafe.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/failsafe/failsafe.c b/drivers/net/failsafe/failsafe.c
index 5e7a8ba..3a747c2 100644
--- a/drivers/net/failsafe/failsafe.c
+++ b/drivers/net/failsafe/failsafe.c
@@ -226,7 +226,7 @@ fs_eth_dev_create(struct rte_vdev_device *vdev)
 							       mac);
 			if (ret) {
 				ERROR("Failed to set default MAC address");
-				goto free_args;
+				goto cancel_alarm;
 			}
 		}
 	} else {
@@ -260,6 +260,8 @@ fs_eth_dev_create(struct rte_vdev_device *vdev)
 		.type = RTE_INTR_HANDLE_EXT,
 	};
 	return 0;
+cancel_alarm:
+	failsafe_hotplug_alarm_cancel(dev);
 free_args:
 	failsafe_args_free(dev);
 free_subs:
-- 
2.7.4