netdev - [net 01/15] net/mlx5: Don't allow health work when device is uninitialized

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Message-Id: <20201001020516.41217-2-saeed@kernel.org>
Date:   Wed, 30 Sep 2020 19:05:02 -0700
From:   saeed@...nel.org
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, Shay Drory <shayd@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Saeed Mahameed <saeedm@...dia.com>
Subject: [net 01/15] net/mlx5: Don't allow health work when device is uninitialized

From: Shay Drory <shayd@...lanox.com>

On error flow due to failure on driver load, driver can be
un-initializing while a health work is running in the background,
health work shouldn't be allowed at this point, as it needs resources to
be initialized and there is no point to recover on driver load failures.

Therefore, introducing a new state bit to indicated if device is
initialized, for health work to check before trying to recover the driver.

Fixes: b6e0b6bebe07 ("net/mlx5: Fix fatal error handling during device load")
Signed-off-by: Shay Drory <shayd@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/health.c | 11 +++++++++++
 drivers/net/ethernet/mellanox/mlx5/core/main.c   |  2 ++
 include/linux/mlx5/driver.h                      |  1 +
 3 files changed, 14 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/health.c b/drivers/net/ethernet/mellanox/mlx5/core/health.c
index b31f769d2df9..c7a8dfe1ae19 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/health.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/health.c
@@ -190,6 +190,11 @@ static bool reset_fw_if_needed(struct mlx5_core_dev *dev)
 	return true;
 }
 
+static bool mlx5_is_device_initialized(struct mlx5_core_dev *dev)
+{
+	return test_bit(MLX5_INTERFACE_STATE_INITIALIZED, &dev->intf_state);
+}
+
 void mlx5_enter_error_state(struct mlx5_core_dev *dev, bool force)
 {
 	bool err_detected = false;
@@ -201,6 +206,9 @@ void mlx5_enter_error_state(struct mlx5_core_dev *dev, bool force)
 		err_detected = true;
 	}
 	mutex_lock(&dev->intf_state_mutex);
+	if (!mlx5_is_device_initialized(dev))
+		return;
+
 	if (!err_detected && dev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR)
 		goto unlock;/* a previous error is still being handled */
 	if (dev->state == MLX5_DEVICE_STATE_UNINITIALIZED) {
@@ -609,6 +617,9 @@ static void mlx5_fw_fatal_reporter_err_work(struct work_struct *work)
 	dev = container_of(priv, struct mlx5_core_dev, priv);
 
 	mlx5_enter_error_state(dev, false);
+	if (!mlx5_is_device_initialized(dev))
+		return;
+
 	if (IS_ERR_OR_NULL(health->fw_fatal_reporter)) {
 		if (mlx5_health_try_recover(dev))
 			mlx5_core_err(dev, "health recovery failed\n");
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c
index ce43e3feccd9..8ebb8d27d3ac 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
@@ -878,6 +878,7 @@ static int mlx5_init_once(struct mlx5_core_dev *dev)
 	dev->tracer = mlx5_fw_tracer_create(dev);
 	dev->hv_vhca = mlx5_hv_vhca_create(dev);
 	dev->rsc_dump = mlx5_rsc_dump_create(dev);
+	set_bit(MLX5_INTERFACE_STATE_INITIALIZED, &dev->intf_state);
 
 	return 0;
 
@@ -906,6 +907,7 @@ static int mlx5_init_once(struct mlx5_core_dev *dev)
 
 static void mlx5_cleanup_once(struct mlx5_core_dev *dev)
 {
+	clear_bit(MLX5_INTERFACE_STATE_INITIALIZED, &dev->intf_state);
 	mlx5_rsc_dump_destroy(dev);
 	mlx5_hv_vhca_destroy(dev->hv_vhca);
 	mlx5_fw_tracer_destroy(dev->tracer);
diff --git a/include/linux/mlx5/driver.h b/include/linux/mlx5/driver.h
index c145de0473bc..223aaaaaf8a6 100644
--- a/include/linux/mlx5/driver.h
+++ b/include/linux/mlx5/driver.h
@@ -594,6 +594,7 @@ enum mlx5_device_state {
 
 enum mlx5_interface_state {
 	MLX5_INTERFACE_STATE_UP = BIT(0),
+	MLX5_INTERFACE_STATE_INITIALIZED = BIT(1),
 };
 
 enum mlx5_pci_status {
-- 
2.26.2