netdev - [PATCH] mlx4_en: fix allocation of CPU affinity reverse-map

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Message-Id: <1361596492-10565-1-git-send-email-klebers@linux.vnet.ibm.com>
Date:	Sat, 23 Feb 2013 02:14:52 -0300
From:	Kleber Sacilotto de Souza <klebers@...ux.vnet.ibm.com>
To:	davem@...emloft.net
Cc:	Amir Vadai <amirv@...lanox.com>, netdev@...r.kernel.org,
	Kleber Sacilotto de Souza <klebers@...ux.vnet.ibm.com>
Subject: [PATCH] mlx4_en: fix allocation of CPU affinity reverse-map

The mlx4_en driver allocates the number of objects for the CPU affinity
reverse-map based on the number of rx rings of the device. However,
mlx4_assign_eq() calls irq_cpu_rmap_add() as many times as IRQ's are
assigned to EQ's, which can be as large as mlx4_dev->caps.comp_pool. If
caps.comp_pool is larger than rx_ring_num we will eventually hit the
BUG_ON() in cpu_rmap_add().

Fix this problem by allocating space for the maximum number of CPU
affinity reverse-map objects we might want to add.

Signed-off-by: Kleber Sacilotto de Souza <klebers@...ux.vnet.ibm.com>
---
 drivers/net/ethernet/mellanox/mlx4/en_netdev.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
index 5944dd6..5385474 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
@@ -1829,7 +1829,7 @@ int mlx4_en_alloc_resources(struct mlx4_en_priv *priv)
 	}
 
 #ifdef CONFIG_RFS_ACCEL
-	priv->dev->rx_cpu_rmap = alloc_irq_cpu_rmap(priv->rx_ring_num);
+	priv->dev->rx_cpu_rmap = alloc_irq_cpu_rmap(priv->mdev->dev->caps.comp_pool);
 	if (!priv->dev->rx_cpu_rmap)
 		goto err;
 #endif
-- 
1.7.1

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