linux-kernel - [PATCH 1/3] nvme/ioctl: don't warn on vectorized uring

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Message-ID: <20250321203604.3911446-2-csander@purestorage.com>
Date: Fri, 21 Mar 2025 14:36:02 -0600
From: Caleb Sander Mateos <csander@...estorage.com>
To: Keith Busch <kbusch@...nel.org>,
	Jens Axboe <axboe@...nel.dk>,
	Christoph Hellwig <hch@....de>,
	Sagi Grimberg <sagi@...mberg.me>
Cc: linux-nvme@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Caleb Sander Mateos <csander@...estorage.com>
Subject: [PATCH 1/3] nvme/ioctl: don't warn on vectorized uring_cmd with fixed buffer

The vectorized io_uring NVMe passthru opcodes don't yet support fixed
buffers. But since userspace can trigger this condition based on the
io_uring SQE parameters, it shouldn't cause a kernel warning.

Signed-off-by: Caleb Sander Mateos <csander@...estorage.com>
Fixes: 23fd22e55b76 ("nvme: wire up fixed buffer support for nvme passthrough")
---
 drivers/nvme/host/ioctl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvme/host/ioctl.c b/drivers/nvme/host/ioctl.c
index 41907b4e1869..6c27d72e8cee 100644
--- a/drivers/nvme/host/ioctl.c
+++ b/drivers/nvme/host/ioctl.c
@@ -139,11 +139,11 @@ static int nvme_map_user_request(struct request *req, u64 ubuffer,
 
 	if (ioucmd && (ioucmd->flags & IORING_URING_CMD_FIXED)) {
 		struct iov_iter iter;
 
 		/* fixedbufs is only for non-vectored io */
-		if (WARN_ON_ONCE(flags & NVME_IOCTL_VEC)) {
+		if (flags & NVME_IOCTL_VEC) {
 			ret = -EINVAL;
 			goto out;
 		}
 		ret = io_uring_cmd_import_fixed(ubuffer, bufflen,
 				rq_data_dir(req), &iter, ioucmd);
-- 
2.45.2