linux-kernel - [PATCH] io_uring/register: drop redundant submitter

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Message-ID: <20250902215108.1925105-1-csander@purestorage.com>
Date: Tue,  2 Sep 2025 15:51:07 -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/register: drop redundant submitter_task check

For IORING_SETUP_SINGLE_ISSUER io_ring_ctx's, io_register_resize_rings()
checks that the current task is the ctx's submitter_task. However, its
caller __io_uring_register() already checks this. Drop the redundant
check in io_register_resize_rings().

Signed-off-by: Caleb Sander Mateos <csander@...estorage.com>
---
 io_uring/register.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/io_uring/register.c b/io_uring/register.c
index a1a9b2884eae..aa5f56ad8358 100644
--- a/io_uring/register.c
+++ b/io_uring/register.c
@@ -406,14 +406,10 @@ static int io_register_resize_rings(struct io_ring_ctx *ctx, void __user *arg)
 	size_t size, sq_array_offset;
 	unsigned i, tail, old_head;
 	struct io_uring_params p;
 	int ret;
 
-	/* for single issuer, must be owner resizing */
-	if (ctx->flags & IORING_SETUP_SINGLE_ISSUER &&
-	    current != ctx->submitter_task)
-		return -EEXIST;
 	/* limited to DEFER_TASKRUN for now */
 	if (!(ctx->flags & IORING_SETUP_DEFER_TASKRUN))
 		return -EINVAL;
 	if (copy_from_user(&p, arg, sizeof(p)))
 		return -EFAULT;
-- 
2.45.2