[PATCH rdma-next 2/3] RDMA/core: Do not indicate device ready when device enablement fails

[Leon Romanovsky <leon@kernel.org>]

From: Jack Morgenstein <jackm@dev.mellanox.co.il>

In procedure ib_register_device, procedure kobject_uevent is called
(advertising that the device is ready for userspace usage) even when
device_enable_and_get() returned an error.

As a result, various RDMA modules attempted to register for the device
even while the device driver was preparing to unregister the device.

Fix this by advertising the device availability only after enabling
the device succeeds.

Fixes: e7a5b4aafd82 ("RDMA/device: Don't fire uevent before device is fully initialized")
Suggested-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
---
 drivers/infiniband/core/device.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index 11485b8748a2..e96f979e6d52 100644
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -1397,9 +1397,6 @@ int ib_register_device(struct ib_device *device, const char *name,
 	}
 
 	ret = enable_device_and_get(device);
-	dev_set_uevent_suppress(&device->dev, false);
-	/* Mark for userspace that device is ready */
-	kobject_uevent(&device->dev.kobj, KOBJ_ADD);
 	if (ret) {
 		void (*dealloc_fn)(struct ib_device *);
 
@@ -1419,8 +1416,12 @@ int ib_register_device(struct ib_device *device, const char *name,
 		ib_device_put(device);
 		__ib_unregister_device(device);
 		device->ops.dealloc_driver = dealloc_fn;
+		dev_set_uevent_suppress(&device->dev, false);
 		return ret;
 	}
+	dev_set_uevent_suppress(&device->dev, false);
+	/* Mark for userspace that device is ready */
+	kobject_uevent(&device->dev.kobj, KOBJ_ADD);
 	ib_device_put(device);
 
 	return 0;
-- 
2.28.0