net/mlx5: Allow async trigger completion execution on single CPU systems

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[ Upstream commit 2808b37b59 ]

For a single CPU system, the kernel thread executing mlx5_cmd_flush()
never releases the CPU but calls down_trylock(&cmd→sem) in a busy loop.
On a single processor system, this leads to a deadlock as the kernel
thread which executes mlx5_cmd_invoke() never gets scheduled. Fix this,
by adding the cond_resched() call to the loop, allow the command
completion kernel thread to execute.

Fixes: 8e715cd613 ("net/mlx5: Set command entry semaphore up once got index free")
Signed-off-by: Alexander Schmidt <alexschm@de.ibm.com>
Signed-off-by: Roy Novich <royno@nvidia.com>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Roy Novich 2022-11-02 23:55:38 -07:00 • committed by Greg Kroah-Hartman

parent 48b73b46a5

commit f13e9ebd29

1 changed files with 8 additions and 3 deletions

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

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