netdev - [net 13/14] net/mlx5: Cleanup IRQs in case of unload failure

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Message-Id: <20171219222456.29627-14-saeedm@mellanox.com>
Date:   Wed, 20 Dec 2017 00:24:55 +0200
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, Moshe Shemesh <moshe@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>
Subject: [net 13/14] net/mlx5: Cleanup IRQs in case of unload failure

From: Moshe Shemesh <moshe@...lanox.com>

When mlx5_stop_eqs fails to destroy any of the eqs it returns with an error.
In such failure flow the function will return without
releasing all EQs irqs and then pci_free_irq_vectors will fail.
Fix by only warn on destroy EQ failure and continue to release other
EQs and their irqs.

It fixes the following kernel trace:
kernel: kernel BUG at drivers/pci/msi.c:352!
...
...
kernel: Call Trace:
kernel: pci_disable_msix+0xd3/0x100
kernel: pci_free_irq_vectors+0xe/0x20
kernel: mlx5_load_one.isra.17+0x9f5/0xec0 [mlx5_core]

Fixes: e126ba97dba9 ("mlx5: Add driver for Mellanox Connect-IB adapters")
Signed-off-by: Moshe Shemesh <moshe@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/eq.c | 20 +++++++++++++-------
 include/linux/mlx5/driver.h                  |  2 +-
 2 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eq.c b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
index 0308a2b4823c..ab4d1465b7e4 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eq.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
@@ -775,7 +775,7 @@ int mlx5_start_eqs(struct mlx5_core_dev *dev)
 	return err;
 }
 
-int mlx5_stop_eqs(struct mlx5_core_dev *dev)
+void mlx5_stop_eqs(struct mlx5_core_dev *dev)
 {
 	struct mlx5_eq_table *table = &dev->priv.eq_table;
 	int err;
@@ -784,22 +784,28 @@ int mlx5_stop_eqs(struct mlx5_core_dev *dev)
 	if (MLX5_CAP_GEN(dev, pg)) {
 		err = mlx5_destroy_unmap_eq(dev, &table->pfault_eq);
 		if (err)
-			return err;
+			mlx5_core_err(dev, "failed to destroy page fault eq, err(%d)\n",
+				      err);
 	}
 #endif
 
 	err = mlx5_destroy_unmap_eq(dev, &table->pages_eq);
 	if (err)
-		return err;
+		mlx5_core_err(dev, "failed to destroy pages eq, err(%d)\n",
+			      err);
 
-	mlx5_destroy_unmap_eq(dev, &table->async_eq);
+	err = mlx5_destroy_unmap_eq(dev, &table->async_eq);
+	if (err)
+		mlx5_core_err(dev, "failed to destroy async eq, err(%d)\n",
+			      err);
 	mlx5_cmd_use_polling(dev);
 
 	err = mlx5_destroy_unmap_eq(dev, &table->cmd_eq);
-	if (err)
+	if (err) {
+		mlx5_core_err(dev, "failed to destroy command eq, err(%d)\n",
+			      err);
 		mlx5_cmd_use_events(dev);
-
-	return err;
+	}
 }
 
 int mlx5_core_eq_query(struct mlx5_core_dev *dev, struct mlx5_eq *eq,
diff --git a/include/linux/mlx5/driver.h b/include/linux/mlx5/driver.h
index 40a6f33c4cde..57b109c6e422 100644
--- a/include/linux/mlx5/driver.h
+++ b/include/linux/mlx5/driver.h
@@ -1049,7 +1049,7 @@ int mlx5_create_map_eq(struct mlx5_core_dev *dev, struct mlx5_eq *eq, u8 vecidx,
 		       enum mlx5_eq_type type);
 int mlx5_destroy_unmap_eq(struct mlx5_core_dev *dev, struct mlx5_eq *eq);
 int mlx5_start_eqs(struct mlx5_core_dev *dev);
-int mlx5_stop_eqs(struct mlx5_core_dev *dev);
+void mlx5_stop_eqs(struct mlx5_core_dev *dev);
 int mlx5_vector2eqn(struct mlx5_core_dev *dev, int vector, int *eqn,
 		    unsigned int *irqn);
 int mlx5_core_attach_mcg(struct mlx5_core_dev *dev, union ib_gid *mgid, u32 qpn);
-- 
2.13.0