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io_uring: make ctx cancel on exit targeted to actual ctx 

Before IORING_SETUP_ATTACH_WQ, we could just cancel everything on the
io-wq when exiting. But that's not the case if they are shared, so
cancel for the specific ctx instead.

Cc: stable@vger.kernel.org
Fixes: 24369c2e3b ("io_uring: add io-wq workqueue sharing")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
zero-sugar-mainline-defconfig
Jens Axboe 2020-12-20 10:45:02 -07:00
parent dd20166236
commit 00c18640c2
1 changed files with 8 additions and 1 deletions
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9
fs/io_uring.c
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@ -8637,6 +8637,13 @@ static void io_ring_exit_work(struct work_struct *work)
io_ring_ctx_free(ctx);
}
static bool io_cancel_ctx_cb(struct io_wq_work *work, void *data)
{
struct io_kiocb *req = container_of(work, struct io_kiocb, work);
return req->ctx == data;
}
static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx)
{
mutex_lock(&ctx->uring_lock);
@ -8651,7 +8658,7 @@ static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx)
io_poll_remove_all(ctx, NULL, NULL);
if (ctx->io_wq)
io_wq_cancel_all(ctx->io_wq);
io_wq_cancel_cb(ctx->io_wq, io_cancel_ctx_cb, ctx, true);
/* if we failed setting up the ctx, we might not have any rings */
io_iopoll_try_reap_events(ctx);