io_uring: fix free entry check for 32b CQEs on CQE32 rings

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On CQE32 rings, len is in units of 32b CQEs when io_cqe_cache_refill()
checks for free entries, so requiring cqe32 + 1 of them means insisting
on 2 free CQEs where 1 is enough, and a ring with a single free entry
needlessly goes to overflow.

Check for a free CQE directly in that case, and keep the cqe32 + 1 check
for CQE_MIXED where the units are 16b.

Fixes: e26dca67fd ("io_uring: add support for IORING_SETUP_CQE_MIXED")
Assisted-by: LLM
Signed-off-by: Hui Peng <benquike@gmail.com>
Link: https://patch.msgid.link/20260919203516.2581409-1-benquike@gmail.com
[axboe: split from Hui's original patch, edited commit message]
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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This commit is contained in:

Hui Peng 2026-09-19 20:35:18 +00:00 • committed by Jens Axboe

parent 2107751744

commit ab5853c068

1 changed files with 4 additions and 3 deletions

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io_uring/io_uring.c

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