From: Keith Busch kbusch@kernel.org
stable inclusion from stable-v6.6.13 commit cc5b051eeb486eddd2700e9eee07ccccbce71463 bugzilla: https://gitee.com/openeuler/kernel/issues/I99TJK
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
--------------------------------
[ 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 Signed-off-by: ZhangPeng zhangpeng362@huawei.com --- 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 431daba68d54..30bdc73ed23d 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -396,6 +396,11 @@ struct nvme_ctrl { KABI_RESERVE(4) };
+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,