net/mlx5: Fix sleep while atomic in mlx5_eswitch_get_vepa

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commit 3d9c5e023a upstream.

rtnl_bridge_getlink is protected by rcu lock, so mlx5_eswitch_get_vepa
cannot take mutex lock. Two possible issues can happen:
1. User at the same time change vepa mode via RTM_SETLINK command.
2. User at the same time change the switchdev mode via devlink netlink
interface.

Case 1 cannot happen because rtnl executes one message in order.
Case 2 can happen but we do not expect user to change the switchdev mode
when changing vepa. Even if a user does it, so he will read a value
which is no longer valid.

Fixes: 8da202b249 ("net/mlx5: E-Switch, Add support for VEPA in legacy mode.")
Signed-off-by: Huy Nguyen <huyn@mellanox.com>
Reviewed-by: Mark Bloch <markb@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Huy Nguyen 2020-02-03 16:32:18 -06:00 • committed by Greg Kroah-Hartman

parent e8a83728b3

commit cb50a7b490

1 changed files with 3 additions and 11 deletions

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drivers/net/ethernet/mellanox/mlx5/core/eswitch.c

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