From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757705Ab3APRAy (ORCPT ); Wed, 16 Jan 2013 12:00:54 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:35918 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757513Ab3APQBJ (ORCPT ); Wed, 16 Jan 2013 11:01:09 -0500 From: Herton Ronaldo Krzesinski To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Jack Morgenstein , Or Gerlitz , Roland Dreier , Herton Ronaldo Krzesinski Subject: [PATCH 058/222] mlx4_core: Fix potential deadlock in mlx4_eq_int() Date: Wed, 16 Jan 2013 13:54:18 -0200 Message-Id: <1358351822-7675-59-git-send-email-herton.krzesinski@canonical.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1358351822-7675-1-git-send-email-herton.krzesinski@canonical.com> References: <1358351822-7675-1-git-send-email-herton.krzesinski@canonical.com> X-Extended-Stable: 3.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.5.7.3 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Jack Morgenstein commit 311f813a2daefcba03f706a692fe0c67888d7622 upstream. The slave_state_lock spinlock is used in both interrupt context and process context, hence irq locking must be used. Found by lockdep. Signed-off-by: Jack Morgenstein Signed-off-by: Or Gerlitz Signed-off-by: Roland Dreier [ herton: adjust context ] Signed-off-by: Herton Ronaldo Krzesinski --- drivers/net/ethernet/mellanox/mlx4/cmd.c | 9 +++++---- drivers/net/ethernet/mellanox/mlx4/eq.c | 10 ++++++---- 2 files changed, 11 insertions(+), 8 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlx4/cmd.c b/drivers/net/ethernet/mellanox/mlx4/cmd.c index 842c8ce..92e7057 100644 --- a/drivers/net/ethernet/mellanox/mlx4/cmd.c +++ b/drivers/net/ethernet/mellanox/mlx4/cmd.c @@ -1256,6 +1256,7 @@ static void mlx4_master_do_cmd(struct mlx4_dev *dev, int slave, u8 cmd, u32 reply; u8 is_going_down = 0; int i; + unsigned long flags; slave_state[slave].comm_toggle ^= 1; reply = (u32) slave_state[slave].comm_toggle << 31; @@ -1330,12 +1331,12 @@ static void mlx4_master_do_cmd(struct mlx4_dev *dev, int slave, u8 cmd, mlx4_warn(dev, "Bad comm cmd:%d from slave:%d\n", cmd, slave); goto reset_slave; } - spin_lock(&priv->mfunc.master.slave_state_lock); + spin_lock_irqsave(&priv->mfunc.master.slave_state_lock, flags); if (!slave_state[slave].is_slave_going_down) slave_state[slave].last_cmd = cmd; else is_going_down = 1; - spin_unlock(&priv->mfunc.master.slave_state_lock); + spin_unlock_irqrestore(&priv->mfunc.master.slave_state_lock, flags); if (is_going_down) { mlx4_warn(dev, "Slave is going down aborting command(%d)" " executing from slave:%d\n", @@ -1351,10 +1352,10 @@ static void mlx4_master_do_cmd(struct mlx4_dev *dev, int slave, u8 cmd, reset_slave: /* cleanup any slave resources */ mlx4_delete_all_resources_for_slave(dev, slave); - spin_lock(&priv->mfunc.master.slave_state_lock); + spin_lock_irqsave(&priv->mfunc.master.slave_state_lock, flags); if (!slave_state[slave].is_slave_going_down) slave_state[slave].last_cmd = MLX4_COMM_CMD_RESET; - spin_unlock(&priv->mfunc.master.slave_state_lock); + spin_unlock_irqrestore(&priv->mfunc.master.slave_state_lock, flags); /*with slave in the middle of flr, no need to clean resources again.*/ inform_slave_state: memset(&slave_state[slave].event_eq, 0, diff --git a/drivers/net/ethernet/mellanox/mlx4/eq.c b/drivers/net/ethernet/mellanox/mlx4/eq.c index bce98d9..aa7b7c3 100644 --- a/drivers/net/ethernet/mellanox/mlx4/eq.c +++ b/drivers/net/ethernet/mellanox/mlx4/eq.c @@ -203,6 +203,7 @@ void mlx4_master_handle_slave_flr(struct work_struct *work) struct mlx4_slave_state *slave_state = priv->mfunc.master.slave_state; int i; int err; + unsigned long flags; mlx4_dbg(dev, "mlx4_handle_slave_flr\n"); @@ -214,10 +215,10 @@ void mlx4_master_handle_slave_flr(struct work_struct *work) mlx4_delete_all_resources_for_slave(dev, i); /*return the slave to running mode*/ - spin_lock(&priv->mfunc.master.slave_state_lock); + spin_lock_irqsave(&priv->mfunc.master.slave_state_lock, flags); slave_state[i].last_cmd = MLX4_COMM_CMD_RESET; slave_state[i].is_slave_going_down = 0; - spin_unlock(&priv->mfunc.master.slave_state_lock); + spin_unlock_irqrestore(&priv->mfunc.master.slave_state_lock, flags); /*notify the FW:*/ err = mlx4_cmd(dev, 0, i, 0, MLX4_CMD_INFORM_FLR_DONE, MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED); @@ -241,6 +242,7 @@ static int mlx4_eq_int(struct mlx4_dev *dev, struct mlx4_eq *eq) u32 flr_slave; u8 update_slave_state; int i; + unsigned long flags; while ((eqe = next_eqe_sw(eq))) { /* @@ -434,13 +436,13 @@ static int mlx4_eq_int(struct mlx4_dev *dev, struct mlx4_eq *eq) } else update_slave_state = 1; - spin_lock(&priv->mfunc.master.slave_state_lock); + spin_lock_irqsave(&priv->mfunc.master.slave_state_lock, flags); if (update_slave_state) { priv->mfunc.master.slave_state[flr_slave].active = false; priv->mfunc.master.slave_state[flr_slave].last_cmd = MLX4_COMM_CMD_FLR; priv->mfunc.master.slave_state[flr_slave].is_slave_going_down = 1; } - spin_unlock(&priv->mfunc.master.slave_state_lock); + spin_unlock_irqrestore(&priv->mfunc.master.slave_state_lock, flags); queue_work(priv->mfunc.master.comm_wq, &priv->mfunc.master.slave_flr_event_work); break; -- 1.7.9.5