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| author | Eran Ben Elisha | 2016-02-29 20:17:11 +0100 |
|---|---|---|
| committer | David S. Miller | 2016-03-02 20:37:25 +0100 |
| commit | 0ad9b20415a461332611666301e7812900a15ad4 (patch) | |
| tree | af20d6cdd599409d38f18cb31f71155d55a178fc /drivers/net/ethernet/mellanox/mlx5/core/en_main.c | |
| parent | net/mlx5e: Fix LRO modify (diff) | |
| download | kernel-qcow2-linux-0ad9b20415a461332611666301e7812900a15ad4.tar.gz kernel-qcow2-linux-0ad9b20415a461332611666301e7812900a15ad4.tar.xz kernel-qcow2-linux-0ad9b20415a461332611666301e7812900a15ad4.zip | |
net/mlx5e: Fix soft lockup when HW Timestamping is enabled
Readers/Writers lock for SW timecounter was acquired without disabling
interrupts on local CPU.
The problematic scenario:
* HW timestamping is enabled
* Timestamp overflow periodic service task is running on local CPU and
holding write_lock for SW timecounter
* Completion arrives, triggers interrupt for local CPU.
Interrupt routine calls napi_schedule(), which triggers rx/tx
skb process.
An attempt to read SW timecounter using read_lock is done, which is
already locked by a writer on the same CPU and cause soft lockup.
Add irqsave/irqrestore for when using the readers/writers lock for
writing.
Fixes: ef9814deafd0 ('net/mlx5e: Add HW timestamping (TS) support')
Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlx5/core/en_main.c')
0 files changed, 0 insertions, 0 deletions