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Subject[PATCH V4 1/5] nvme: do atomically bit operations on nvme_request.flags
Date
Do atomically bit operations on nvme_request.flags instead of
regular read/write, then we could add other flags and set/clear
them safely.

Signed-off-by: Jianchao Wang <jianchao.w.wang@oracle.com>
---
drivers/nvme/host/core.c | 4 ++--
drivers/nvme/host/lightnvm.c | 4 ++--
drivers/nvme/host/nvme.h | 4 ++--
drivers/nvme/host/pci.c | 4 ++--
4 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 29ead91..7b8df47 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -674,7 +674,7 @@ int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
blk_execute_rq(req->q, NULL, req, at_head);
if (result)
*result = nvme_req(req)->result;
- if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
+ if (test_bit(NVME_REQ_CANCELLED, &nvme_req(req)->flags))
ret = -EINTR;
else
ret = nvme_req(req)->status;
@@ -763,7 +763,7 @@ static int nvme_submit_user_cmd(struct request_queue *q,
}

blk_execute_rq(req->q, disk, req, 0);
- if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
+ if (test_bit(NVME_REQ_CANCELLED, &nvme_req(req)->flags))
ret = -EINTR;
else
ret = nvme_req(req)->status;
diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c
index 50ef71ee..fd0c499 100644
--- a/drivers/nvme/host/lightnvm.c
+++ b/drivers/nvme/host/lightnvm.c
@@ -470,7 +470,7 @@ static int nvme_nvm_submit_io_sync(struct nvm_dev *dev, struct nvm_rq *rqd)
* handle the error accordingly.
*/
blk_execute_rq(q, NULL, rq, 0);
- if (nvme_req(rq)->flags & NVME_REQ_CANCELLED)
+ if (test_bit(NVME_REQ_CANCELLED, &nvme_req(rq)->flags))
ret = -EINTR;

rqd->ppa_status = le64_to_cpu(nvme_req(rq)->result.u64);
@@ -599,7 +599,7 @@ static int nvme_nvm_submit_user_cmd(struct request_queue *q,

blk_execute_rq(q, NULL, rq, 0);

- if (nvme_req(rq)->flags & NVME_REQ_CANCELLED)
+ if (test_bit(NVME_REQ_CANCELLED, &nvme_req(rq)->flags))
ret = -EINTR;
else if (nvme_req(rq)->status & 0x7ff)
ret = -EIO;
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index e80fd74..02097e8 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -93,8 +93,8 @@ struct nvme_request {
struct nvme_command *cmd;
union nvme_result result;
u8 retries;
- u8 flags;
u16 status;
+ unsigned long flags;
};

/*
@@ -103,7 +103,7 @@ struct nvme_request {
#define REQ_NVME_MPATH REQ_DRV

enum {
- NVME_REQ_CANCELLED = (1 << 0),
+ NVME_REQ_CANCELLED = 0,
};

static inline struct nvme_request *nvme_req(struct request *req)
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 73036d2..e186158 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -1222,7 +1222,7 @@ static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved)
"I/O %d QID %d timeout, disable controller\n",
req->tag, nvmeq->qid);
nvme_dev_disable(dev, false);
- nvme_req(req)->flags |= NVME_REQ_CANCELLED;
+ set_bit(NVME_REQ_CANCELLED, &nvme_req(req)->flags);
return BLK_EH_HANDLED;
default:
break;
@@ -1244,7 +1244,7 @@ static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved)
* Mark the request as handled, since the inline shutdown
* forces all outstanding requests to complete.
*/
- nvme_req(req)->flags |= NVME_REQ_CANCELLED;
+ set_bit(NVME_REQ_CANCELLED, &nvme_req(req)->flags);
return BLK_EH_HANDLED;
}

--
2.7.4
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