linux-kernel - [PATCH 3.16 111/245] IB/mlx4: Follow mirror sequence of device add during device removal

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Message-ID: <lsq.1587683028.748862993@decadent.org.uk>
Date:   Fri, 24 Apr 2020 00:05:38 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Maor Gottlieb" <maorg@...lanox.com>,
        "Doug Ledford" <dledford@...hat.com>,
        "Parav Pandit" <parav@...lanox.com>,
        "Leon Romanovsky" <leonro@...lanox.com>
Subject: [PATCH 3.16 111/245] IB/mlx4: Follow mirror sequence of device
 add during device removal

3.16.83-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Parav Pandit <parav@...lanox.com>

commit 89f988d93c62384758b19323c886db917a80c371 upstream.

Current code device add sequence is:

ib_register_device()
ib_mad_init()
init_sriov_init()
register_netdev_notifier()

Therefore, the remove sequence should be,

unregister_netdev_notifier()
close_sriov()
mad_cleanup()
ib_unregister_device()

However it is not above.
Hence, make do above remove sequence.

Fixes: fa417f7b520ee ("IB/mlx4: Add support for IBoE")
Signed-off-by: Parav Pandit <parav@...lanox.com>
Reviewed-by: Maor Gottlieb <maorg@...lanox.com>
Signed-off-by: Leon Romanovsky <leonro@...lanox.com>
Link: https://lore.kernel.org/r/20191212091214.315005-3-leon@kernel.org
Signed-off-by: Doug Ledford <dledford@...hat.com>
[bwh: Backported to 3.16: No need to call mlx4_ib_diag_cleanup()]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/drivers/infiniband/hw/mlx4/main.c
+++ b/drivers/infiniband/hw/mlx4/main.c
@@ -2372,15 +2372,16 @@ static void mlx4_ib_remove(struct mlx4_d
 	ibdev->ib_active = false;
 	flush_workqueue(wq);
 
-	mlx4_ib_close_sriov(ibdev);
-	mlx4_ib_mad_cleanup(ibdev);
-	ib_unregister_device(&ibdev->ib_dev);
 	if (ibdev->iboe.nb.notifier_call) {
 		if (unregister_netdevice_notifier(&ibdev->iboe.nb))
 			pr_warn("failure unregistering notifier\n");
 		ibdev->iboe.nb.notifier_call = NULL;
 	}
 
+	mlx4_ib_close_sriov(ibdev);
+	mlx4_ib_mad_cleanup(ibdev);
+	ib_unregister_device(&ibdev->ib_dev);
+
 	mlx4_qp_release_range(dev, ibdev->steer_qpn_base,
 			      ibdev->steer_qpn_count);
 	kfree(ibdev->ib_uc_qpns_bitmap);