[PATCH 3.2 06/34] mlx4_en: don't use napi_synchronize inside mlx4_en_netpoll
From: Ben Hutchings <hidden>
Date: 2014-05-16 12:50:46
Also in:
lkml
3.2.59-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Chris Mason <clm@fb.com> commit c98235cb8584a72e95786e17d695a8e5fafcd766 upstream. The mlx4 driver is triggering schedules while atomic inside mlx4_en_netpoll: spin_lock_irqsave(&cq->lock, flags); napi_synchronize(&cq->napi); ^^^^^ msleep here mlx4_en_process_rx_cq(dev, cq, 0); spin_unlock_irqrestore(&cq->lock, flags); This was part of a patch by Alexander Guller from Mellanox in 2011, but it still isn't upstream. Signed-off-by: Chris Mason <clm@fb.com> Acked-By: Amir Vadai <redacted> Signed-off-by: David S. Miller <davem@davemloft.net> [bwh: Backported to 3.2: adjust context] Signed-off-by: Ben Hutchings <redacted> --- drivers/net/ethernet/mellanox/mlx4/en_cq.c | 1 - drivers/net/ethernet/mellanox/mlx4/en_netdev.c | 6 +----- drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | 1 - 3 files changed, 1 insertion(+), 7 deletions(-)
--- a/drivers/net/ethernet/mellanox/mlx4/en_cq.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_cq.c@@ -58,7 +58,6 @@ int mlx4_en_create_cq(struct mlx4_en_pri cq->ring = ring; cq->is_tx = mode; - spin_lock_init(&cq->lock); err = mlx4_alloc_hwq_res(mdev->dev, &cq->wqres, cq->buf_size, 2 * PAGE_SIZE); --- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
@@ -355,15 +355,11 @@ static void mlx4_en_netpoll(struct net_d { struct mlx4_en_priv *priv = netdev_priv(dev); struct mlx4_en_cq *cq; - unsigned long flags; int i; for (i = 0; i < priv->rx_ring_num; i++) { cq = &priv->rx_cq[i]; - spin_lock_irqsave(&cq->lock, flags); - napi_synchronize(&cq->napi); - mlx4_en_process_rx_cq(dev, cq, 0); - spin_unlock_irqrestore(&cq->lock, flags); + napi_schedule(&cq->napi); } } #endif --- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h +++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
@@ -300,7 +300,6 @@ struct mlx4_en_cq { struct mlx4_cq mcq; struct mlx4_hwq_resources wqres; int ring; - spinlock_t lock; struct net_device *dev; struct napi_struct napi; /* Per-core Tx cq processing support */