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io_uring: fix invalid ctx->sq_thread_idle

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We have to set ctx->sq_thread_idle before adding a ring to an SQ task,
otherwise sqd races for seeing zero and accounting it as such.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-03-10 13:13:53 +00:00 committed by Jens Axboe
parent e22bc9b481
commit 78d7f6ba82
1 changed files with 4 additions and 4 deletions
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8
fs/io_uring.c
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@ -7829,14 +7829,14 @@ static int io_sq_offload_create(struct io_ring_ctx *ctx,
ctx->sq_creds = get_current_cred();
ctx->sq_data = sqd;
io_sq_thread_park(sqd);
list_add(&ctx->sqd_list, &sqd->ctx_new_list);
io_sq_thread_unpark(sqd);
ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle);
if (!ctx->sq_thread_idle)
ctx->sq_thread_idle = HZ;
io_sq_thread_park(sqd);
list_add(&ctx->sqd_list, &sqd->ctx_new_list);
io_sq_thread_unpark(sqd);
if (sqd->thread)
return 0;