nvme: mark the result argument to nvme_complete_async_event volatile

Christoph Hellwig · Keith Busch · commit 287a63ebbe7c · 2018-05-18T14:41:35.000-06:00
We'll need that in the PCIe driver soon as we'll read it straight off the
CQ.

Signed-off-by: Christoph Hellwig &lt;hch@lst.de&gt;
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
@@ -3344,7 +3344,7 @@ static void nvme_fw_act_work(struct work_struct *work)
 }
 
 void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
-		union nvme_result *res)
+		volatile union nvme_result *res)
 {
 	u32 result = le32_to_cpu(res->u32);
 
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
@@ -400,7 +400,7 @@ int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
 		bool send);
 
 void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
-		union nvme_result *res);
+		volatile union nvme_result *res);
 
 void nvme_stop_queues(struct nvme_ctrl *ctrl);
 void nvme_start_queues(struct nvme_ctrl *ctrl);

Original file line number	Diff line number	Diff line change
`@@ -3344,7 +3344,7 @@ static void nvme_fw_act_work(struct work_struct *work)`
`3344`	`3344`	`}`
`3345`	`3345`
`3346`	`3346`	`void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,`
`3347`		`- union nvme_result *res)`
	`3347`	`+ volatile union nvme_result *res)`
`3348`	`3348`	`{`
`3349`	`3349`	`u32 result = le32_to_cpu(res->u32);`
`3350`	`3350`