4.19-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit 14a1336e6fff47dd1028b484d6c802105c58e2ee ]
Without CONFIG_NVME_MULTIPATH enabled a multi-port subsystem might show up as invididual devices and cause problems, warn about it.
Signed-off-by: Christoph Hellwig hch@lst.de Reviewed-by: Sagi Grimberg sagi@grimberg.me Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/nvme/host/nvme.h | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index bb4a2003c097..60220de2db52 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -537,6 +537,9 @@ static inline void nvme_mpath_check_last_path(struct nvme_ns *ns) static inline int nvme_mpath_init(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id) { + if (ctrl->subsys->cmic & (1 << 3)) + dev_warn(ctrl->device, +"Please enable CONFIG_NVME_MULTIPATH for full support of multi-port devices.\n"); return 0; } static inline void nvme_mpath_uninit(struct nvme_ctrl *ctrl)