[PATCHv2 1/2] nvme: introduce helper function to get ctrl state

[Keith Busch]

From: Keith Busch <kbusch at kernel.org>

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().

Signed-off-by: Keith Busch <kbusch at kernel.org>
---
 drivers/nvme/host/nvme.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 39a90b7cb1254..578e6d311bc9c 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -387,6 +387,11 @@ 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,
-- 
2.34.1