From: Keith Busch <kbusch@kernel.org>
Date: Mon, 30 Oct 2023 15:13:09 +0000 (-0700)
Subject: nvme: introduce helper function to get ctrl state
X-Git-Tag: v6.1.74~67
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=df2bd52354d8f5ffc4c9cbedad414794d86be5a0;p=thirdparty%2Fkernel%2Fstable.git

nvme: introduce helper function to get ctrl state

[ Upstream commit 5c687c287c46fadb14644091823298875a5216aa ]

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>
---

diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 118bf08a708b9..a892d679e3389 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -382,6 +382,11 @@ 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,