[PATCH v4 03/20] nvme: update nvme_passthru_end() signature

[Nilay Shroff <nilay@linux.ibm.com>]

Change nvme_passthru_end() to return the command effects value passed
to it.

This is a preparatory change for Clang's context/thread-safety analysis
support. The conditional release annotations (__cond_releases()) model
lock release based on a function's return value. Returning the existing
effects value allows a subsequent patch to annotate nvme_passthru_end()
as conditionally releasing locks acquired by nvme_passthru_start().

No functional change intended.

A follow-up patch will add the corresponding context analysis
annotations.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nilay Shroff <nilay@linux.ibm.com>
---
 drivers/nvme/host/core.c | 6 ++++--
 drivers/nvme/host/nvme.h | 2 +-
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 453c1f0b2dd0..d6a095e1e44e 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1268,7 +1268,7 @@ u32 nvme_passthru_start(struct nvme_ctrl *ctrl, struct nvme_ns *ns, u8 opcode)
 }
 EXPORT_SYMBOL_NS_GPL(nvme_passthru_start, "NVME_TARGET_PASSTHRU");
 
-void nvme_passthru_end(struct nvme_ctrl *ctrl, struct nvme_ns *ns, u32 effects,
+u32 nvme_passthru_end(struct nvme_ctrl *ctrl, struct nvme_ns *ns, u32 effects,
 		       struct nvme_command *cmd, int status)
 {
 	if (effects & NVME_CMD_EFFECTS_CSE_MASK) {
@@ -1289,7 +1289,7 @@ void nvme_passthru_end(struct nvme_ctrl *ctrl, struct nvme_ns *ns, u32 effects,
 		flush_work(&ctrl->scan_work);
 	}
 	if (ns)
-		return;
+		return effects;
 
 	switch (cmd->common.opcode) {
 	case nvme_admin_set_features:
@@ -1310,6 +1310,8 @@ void nvme_passthru_end(struct nvme_ctrl *ctrl, struct nvme_ns *ns, u32 effects,
 	default:
 		break;
 	}
+
+	return effects;
 }
 EXPORT_SYMBOL_NS_GPL(nvme_passthru_end, "NVME_TARGET_PASSTHRU");
 
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 824651cc898d..0797c3a6a9c1 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -1292,7 +1292,7 @@ u32 nvme_command_effects(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 			 u8 opcode);
 u32 nvme_passthru_start(struct nvme_ctrl *ctrl, struct nvme_ns *ns, u8 opcode);
 int nvme_execute_rq(struct request *rq, bool at_head);
-void nvme_passthru_end(struct nvme_ctrl *ctrl, struct nvme_ns *ns, u32 effects,
+u32 nvme_passthru_end(struct nvme_ctrl *ctrl, struct nvme_ns *ns, u32 effects,
 		       struct nvme_command *cmd, int status);
 struct nvme_ctrl *nvme_ctrl_from_file(struct file *file);
 struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid);
-- 
2.53.0