IB/mlx5: Call io_stop_wc() after writing to WC MMIO

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This new function is defined only on ARM and serves to guarantee a barrier
in the WC operation. The barrier means that another run of this loop will
not combine with the stores this loop created.

On x86 this is happening implicitly because of the spin_unlock().

Link: https://lore.kernel.org/r/0-v1-c5dade92f363+11-mlx5_io_stop_wc_jgg@nvidia.com
Suggested-by: Pavel Shamis <Pavel.Shamis@arm.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>

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Jason Gunthorpe 2022-07-29 13:33:38 -03:00 • committed by Leon Romanovsky

parent 568035b01c

commit 19d6214ad6

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drivers/infiniband/hw/mlx5/mem.c

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