[PATCH 3/5] nvme: take const cmd pointer in read-only helpers

[Caleb Sander]

nvme_is_fabrics() and nvme_is_write() only read struct nvme_command,
so take it by const pointer. This allows callers to pass a const pointer
and communicates that these functions don't modify the command.

Signed-off-by: Caleb Sander <csander at purestorage.com>
---
 include/linux/nvme.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/nvme.h b/include/linux/nvme.h
index 68eff8c86ce3..bc605ec4a3fd 100644
--- a/include/linux/nvme.h
+++ b/include/linux/nvme.h
@@ -1810,11 +1810,11 @@ struct nvme_command {
 		struct nvme_dbbuf dbbuf;
 		struct nvme_directive_cmd directive;
 	};
 };
 
-static inline bool nvme_is_fabrics(struct nvme_command *cmd)
+static inline bool nvme_is_fabrics(const struct nvme_command *cmd)
 {
 	return cmd->common.opcode == nvme_fabrics_command;
 }
 
 struct nvme_error_slot {
@@ -1829,11 +1829,11 @@ struct nvme_error_slot {
 	__u8		resv[3];
 	__le64		cs;
 	__u8		resv2[24];
 };
 
-static inline bool nvme_is_write(struct nvme_command *cmd)
+static inline bool nvme_is_write(const struct nvme_command *cmd)
 {
 	/*
 	 * What a mess...
 	 *
 	 * Why can't we simply have a Fabrics In and Fabrics out command?
-- 
2.25.1