linux-kernel - [PATCH 4.9 081/120] net/mlx5: Only cancel recovery work when cleaning up device

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Date:   Wed, 18 Jan 2017 11:46:39 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Daniel Jurgens <danielj@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.9 081/120] net/mlx5: Only cancel recovery work when cleaning up device

4.9-stable review patch.  If anyone has any objections, please let me know.

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

From: Daniel Jurgens <danielj@...lanox.com>

commit 5e44fca5047054f1762813751626b5245e0da022 upstream.

Do not attempt to drain the health workqueue when unloading the device in
the recovery flow, this can cause a deadlock when the recovery work
tries to cancel itself with sync.

Because the work is no longer unconditionally canceled when unloading, it
must be explicitly canceled in the AER flow.

fixes: 689a248df83b ("net/mlx5: Cancel recovery work in remove flow")
Signed-off-by: Daniel Jurgens <danielj@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/ethernet/mellanox/mlx5/core/main.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlx5/core/main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
@@ -1158,7 +1158,8 @@ static int mlx5_unload_one(struct mlx5_c
 {
 	int err = 0;

-	mlx5_drain_health_wq(dev);
+	if (cleanup)
+		mlx5_drain_health_wq(dev);

 	mutex_lock(&dev->intf_state_mutex);
 	if (test_bit(MLX5_INTERFACE_STATE_DOWN, &dev->intf_state)) {
@@ -1320,9 +1321,10 @@ static pci_ers_result_t mlx5_pci_err_det

 	mlx5_enter_error_state(dev);
 	mlx5_unload_one(dev, priv, false);
-	/* In case of kernel call save the pci state */
+	/* In case of kernel call save the pci state and drain the health wq */
 	if (state) {
 		pci_save_state(pdev);
+		mlx5_drain_health_wq(dev);
 		mlx5_pci_disable_device(dev);
 	}