Moni Shoua 33814e5d12 net/mlx5: Take lock with IRQs disabled to avoid deadlock ... The lock in qp_table might be taken from process context or from interrupt context. This may lead to a deadlock unless it is taken with IRQs disabled. Discovered by lockdep ================================ WARNING: inconsistent lock state 4.20.0-rc6 -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} python/12572 [HC1[1]:SC0[0]:HE0:SE1] takes: 00000000052a4df4 (&(&table->lock)->rlock#2){?.+.}, /0x50 [mlx5_core] {HARDIRQ-ON-W} state was registered at: _raw_spin_lock+0x33/0x70 mlx5_get_rsc+0x1a/0x50 [mlx5_core] mlx5_ib_eqe_pf_action+0x493/0x1be0 [mlx5_ib] process_one_work+0x90c/0x1820 worker_thread+0x87/0xbb0 kthread+0x320/0x3e0 ret_from_fork+0x24/0x30 irq event stamp: 103928 hardirqs last enabled at (103927): [] nk+0x1a/0x1c hardirqs last disabled at (103928): [] unk+0x1a/0x1c softirqs last enabled at (103924): [] tcp_sendmsg+0x31/0x40 softirqs last disabled at (103922): [] 80 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&(&table->lock)->rlock#2); lock(&(&table->lock)->rlock#2); *** DEADLOCK *** Fixes: 032080ab43 ("IB/mlx5: Lock QP during page fault handling") Signed-off-by: Moni Shoua <monis@mellanox.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>		2019-01-25 12:00:28 -08:00
..
mlx4	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2019-01-16 05:13:36 +12:00
mlx5/core	net/mlx5: Take lock with IRQs disabled to avoid deadlock	2019-01-25 12:00:28 -08:00
mlxfw	net/mlxfw: Properly handle dependancy with non-loadable mlx5	2017-07-03 02:32:25 -07:00
mlxsw	mlxsw: spectrum_switchdev: Do not treat static FDB entries as sticky	2019-01-18 15:12:16 -08:00
Kconfig	Change Kconfig description	2017-08-14 11:18:16 -07:00
Makefile	Add the mlxfw module for Mellanox firmware flash process	2017-05-25 17:46:17 -04:00