RDMA/core: Do not indicate device ready when device enablement fails

[ Upstream commit 779e0bf47632c609c59f527f9711ecd3214dccb0 ]

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")
Link: https://lore.kernel.org/r/20201208073545.9723-3-leon@kernel.org
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>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index 59dc9f3cfb3763f9c4f5062397422e38130c267f..256d379bba676b91c3350da0af4254169b3c3d6c 100644 (file)
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -1387,9 +1387,6 @@ 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 *);
 
@@ -1409,8 +1406,12 @@ 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;