linux-kernel - [PATCH] io_uring/uring_cmd: correct io_uring_cmd

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Message-ID: <20250902012609.1513123-1-csander@purestorage.com>
Date: Mon,  1 Sep 2025 19:26:07 -0600
From: Caleb Sander Mateos <csander@...estorage.com>
To: Jens Axboe <axboe@...nel.dk>
Cc: Caleb Sander Mateos <csander@...estorage.com>,
	io-uring@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] io_uring/uring_cmd: correct io_uring_cmd_done() ret type

io_uring_cmd_done() takes the result code for the CQE as a ssize_t ret
argument. However, the CQE res field is a s32 value, as is the argument
to io_req_set_res(). To clarify that only s32 values can be faithfully
represented without truncation, change io_uring_cmd_done()'s ret
argument type to s32.

Signed-off-by: Caleb Sander Mateos <csander@...estorage.com>
---
 include/linux/io_uring/cmd.h | 4 ++--
 io_uring/uring_cmd.c         | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/io_uring/cmd.h b/include/linux/io_uring/cmd.h
index 4bd3a7339243..64e5dd20ef3f 100644
--- a/include/linux/io_uring/cmd.h
+++ b/include/linux/io_uring/cmd.h
@@ -51,11 +51,11 @@ int io_uring_cmd_import_fixed_vec(struct io_uring_cmd *ioucmd,
  * and the corresponding io_uring request.
  *
  * Note: the caller should never hard code @issue_flags and is only allowed
  * to pass the mask provided by the core io_uring code.
  */
-void io_uring_cmd_done(struct io_uring_cmd *cmd, ssize_t ret, u64 res2,
+void io_uring_cmd_done(struct io_uring_cmd *cmd, s32 ret, u64 res2,
 			unsigned issue_flags);
 
 void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,
 			    void (*task_work_cb)(struct io_uring_cmd *, unsigned),
 			    unsigned flags);
@@ -99,11 +99,11 @@ static inline int io_uring_cmd_import_fixed_vec(struct io_uring_cmd *ioucmd,
 						int ddir, struct iov_iter *iter,
 						unsigned issue_flags)
 {
 	return -EOPNOTSUPP;
 }
-static inline void io_uring_cmd_done(struct io_uring_cmd *cmd, ssize_t ret,
+static inline void io_uring_cmd_done(struct io_uring_cmd *cmd, s32 ret,
 		u64 ret2, unsigned issue_flags)
 {
 }
 static inline void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,
 			    void (*task_work_cb)(struct io_uring_cmd *, unsigned),
diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c
index f5a2642bb407..2235ba94d3f0 100644
--- a/io_uring/uring_cmd.c
+++ b/io_uring/uring_cmd.c
@@ -149,11 +149,11 @@ static inline void io_req_set_cqe32_extra(struct io_kiocb *req,
 
 /*
  * Called by consumers of io_uring_cmd, if they originally returned
  * -EIOCBQUEUED upon receiving the command.
  */
-void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, u64 res2,
+void io_uring_cmd_done(struct io_uring_cmd *ioucmd, s32 ret, u64 res2,
 		       unsigned issue_flags)
 {
 	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
 
 	if (WARN_ON_ONCE(req->flags & REQ_F_APOLL_MULTISHOT))
-- 
2.45.2