tree 3603709549c49bc245f29027caad6e3158b97820
parent 1730a2b9e5b5df516c6c6e90b03ee517d06524ad
author Mohamad Haj Yahia <mohamad@mellanox.com> 1487841576 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1496830065 +0200

net/mlx5: Avoid using pending command interface slots


[ Upstream commit 73dd3a4839c1d27c36d4dcc92e1ff44225ecbeb7 ]

Currently when firmware command gets stuck or it takes long time to
complete, the driver command will get timeout and the command slot is
freed and can be used for new commands, and if the firmware receive new
command on the old busy slot its behavior is unexpected and this could
be harmful.
To fix this when the driver command gets timeout we return failure,
but we don't free the command slot and we wait for the firmware to
explicitly respond to that command.
Once all the entries are busy we will stop processing new firmware
commands.

Fixes: 9cba4ebcf374 ('net/mlx5: Fix potential deadlock in command mode change')
Signed-off-by: Mohamad Haj Yahia <mohamad@mellanox.com>
Cc: kernel-team@fb.com
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>