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authorPavel Begunkov <asml.silence@gmail.com>2021-03-10 16:13:53 +0300
committerJens Axboe <axboe@kernel.dk>2021-03-10 17:29:59 +0300
commit78d7f6ba82edb7f8763390982be29051c4216772 (patch)
treed51954e554ee3f20efe5f3471896c24370ddd327 /fs/io_uring.c
parente22bc9b481a90d7898984ea17621f04a653e2cd1 (diff)
downloadlinux-78d7f6ba82edb7f8763390982be29051c4216772.tar.xz
io_uring: fix invalid ctx->sq_thread_idle
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>
Diffstat (limited to 'fs/io_uring.c')
-rw-r--r--fs/io_uring.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 14165e18020c..7072c0eb22c1 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -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;