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Revert "nvme-pci: remove last_sq_tail"
[ Upstream commit 3821080 ] Multiple CPUs may be mapped to the same hctx, allowing mulitple submission contexts to attempt commit_rqs(). We need to verify we're not writing the same doorbell value multiple times since that's a spec violation. Revert commit 54b2fce. Link: https://bugzilla.redhat.com/show_bug.cgi?id=1878596 Reported-by: "B.L. Jones" <brandon.gustav@googlemail.com> Signed-off-by: Keith Busch <kbusch@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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