This is a note to let you know that I've just added the patch titled
nvme: introduce helper function to get ctrl state
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nvme-introduce-helper-function-to-get-ctrl-state.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit a97371d7890712a845b5342c3dd532d610f2dd1e
Author: Keith Busch <kbusch@xxxxxxxxxx>
Date: Mon Oct 30 08:13:09 2023 -0700
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@xxxxxxxxxxx>
Signed-off-by: Keith Busch <kbusch@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 74f74b459f5f..13f71461f5f1 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -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,
