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| author | Jack Morgenstein <jackm@dev.mellanox.co.il> | 2012-11-27 16:24:30 +0000 |
|---|---|---|
| committer | Roland Dreier <roland@purestorage.com> | 2012-11-29 12:14:54 -0800 |
| commit | 311f813a2daefcba03f706a692fe0c67888d7622 (patch) | |
| tree | ab2b5e480aa0a8cd35d7e63a1346f89b10009c0b /drivers/net/ethernet/mellanox/mlx4/eq.c | |
| parent | ceb7decb366591e9b67d70832e07f5d240572a3d (diff) | |
| download | blackbird-op-linux-311f813a2daefcba03f706a692fe0c67888d7622.tar.gz blackbird-op-linux-311f813a2daefcba03f706a692fe0c67888d7622.zip | |
mlx4_core: Fix potential deadlock in mlx4_eq_int()
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 <jackm@dev.mellanox.co.il>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlx4/eq.c')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx4/eq.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx4/eq.c b/drivers/net/ethernet/mellanox/mlx4/eq.c index c509a86db610..3cb7727408e5 100644 --- a/drivers/net/ethernet/mellanox/mlx4/eq.c +++ b/drivers/net/ethernet/mellanox/mlx4/eq.c @@ -407,6 +407,7 @@ 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"); @@ -418,10 +419,10 @@ 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); @@ -446,6 +447,7 @@ static int mlx4_eq_int(struct mlx4_dev *dev, struct mlx4_eq *eq) u8 update_slave_state; int i; enum slave_port_gen_event gen_event; + unsigned long flags; while ((eqe = next_eqe_sw(eq, dev->caps.eqe_factor))) { /* @@ -653,13 +655,13 @@ 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; |
