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nvme: introduce helper function to get ctrl state

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[ Upstream commit 5c687c287c ]

The controller state is typically written by another CPU, so reading it
should ensure no optimizations are taken. This is a repeated pattern in
the driver, so start with adding a convenience function that returns the
controller state with READ_ONCE().

Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Keith Busch 2023-10-30 08:13:09 -07:00 committed by Greg Kroah-Hartman
parent 8392d32347
commit cc5b051eeb
1 changed files with 5 additions and 0 deletions
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5
drivers/nvme/host/nvme.h
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@ -391,6 +391,11 @@ struct nvme_ctrl {
enum nvme_dctype dctype;
};
static inline enum nvme_ctrl_state nvme_ctrl_state(struct nvme_ctrl *ctrl)
{
return READ_ONCE(ctrl->state);
}
enum nvme_iopolicy {
NVME_IOPOLICY_NUMA,
NVME_IOPOLICY_RR,