nvme: warn of unhandled effects only once

We don't need to repeatedly spam the kernel logs with the same warning
about unhandled passthrough IO effects. Just one warning is sufficient
to observe this condition occurs.
Signed-off-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

drivers/nvme/host/core.c

@@ -1072,9 +1072,9 @@ u32 nvme_command_effects(struct nvme_ctrl *ctrl, struct nvme_ns *ns, u8 opcode)
 		if (ns->head->effects)
 			effects = le32_to_cpu(ns->head->effects->iocs[opcode]);
 		if (effects & ~(NVME_CMD_EFFECTS_CSUPP | NVME_CMD_EFFECTS_LBCC))
-			dev_warn(ctrl->device,
-				 "IO command:%02x has unhandled effects:%08x\n",
-				 opcode, effects);
+			dev_warn_once(ctrl->device,
+				"IO command:%02x has unhandled effects:%08x\n",
+				opcode, effects);
 		return 0;
 	}