RDMA/qedr: eliminate duplicate barriers on weakly-ordered archs

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Code includes wmb() followed by writel() in multiple places. writel()
already has a barrier on some architectures like arm64.

This ends up CPU observing two barriers back to back before executing the
register write.

Since code already has an explicit barrier call, changing writel() to
writel_relaxed().

Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

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Sinan Kaya 2018-03-13 23:20:24 -04:00 • committed by Jason Gunthorpe

parent 7b48221cf4

commit 561e5d4896

1 changed files with 2 additions and 2 deletions

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4

drivers/infiniband/hw/qedr/verbs.c

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