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io_uring/msg-ring: ensure flags passing works for task_work completions 

If the target ring is using IORING_SETUP_SINGLE_ISSUER and we're posting
a message from a different thread, then we need to ensure that the
fallback task_work that posts the CQE knwos about the flags passing as
well. If not we'll always be posting 0 as the flags.

Fixes: 3563d7ed58a5 ("io_uring/msg_ring: Pass custom flags to the cqe")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2023-01-21 19:53:41 -07:00
parent f30bd4d038
commit 8572df941c
1 changed files with 6 additions and 1 deletions
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7
io_uring/msg_ring.c
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@ -99,6 +99,11 @@ static void io_msg_tw_complete(struct callback_head *head)
if (current->flags & PF_EXITING) {
ret = -EOWNERDEAD;
} else {
u32 flags = 0;
if (msg->flags & IORING_MSG_RING_FLAGS_PASS)
flags = msg->cqe_flags;
/*
* If the target ring is using IOPOLL mode, then we need to be
* holding the uring_lock for posting completions. Other ring
@ -107,7 +112,7 @@ static void io_msg_tw_complete(struct callback_head *head)
*/
if (target_ctx->flags & IORING_SETUP_IOPOLL)
mutex_lock(&target_ctx->uring_lock);
if (!io_post_aux_cqe(target_ctx, msg->user_data, msg->len, 0))
if (!io_post_aux_cqe(target_ctx, msg->user_data, msg->len, flags))
ret = -EOVERFLOW;
if (target_ctx->flags & IORING_SETUP_IOPOLL)
mutex_unlock(&target_ctx->uring_lock);