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io_uring: choose right tctx->io_wq for try cancel

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When we cancel SQPOLL, @task in io_uring_try_cancel_requests() will
differ from current. Use the right tctx from passed in @task, and don't
forget that it can be NULL when the io_uring ctx exits.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-03-01 18:20:45 +00:00 committed by Jens Axboe
parent 3e6a0d3c75
commit 64c7212391
1 changed files with 2 additions and 1 deletions
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3
fs/io_uring.c
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@ -8636,7 +8636,8 @@ static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx,
struct files_struct *files)
{
struct io_task_cancel cancel = { .task = task, .files = files, };
struct io_uring_task *tctx = current->io_uring;
struct task_struct *tctx_task = task ?: current;
struct io_uring_task *tctx = tctx_task->io_uring;
while (1) {
enum io_wq_cancel cret;