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io_uring: ensure io-wq context is always destroyed for tasks

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If the task ends up doing no IO, the context list is empty and we don't
call into __io_uring_files_cancel() when the task exits. This can cause
a leak of the io-wq structures.

Ensure we always call __io_uring_files_cancel(), even if the task
context list is empty.

Fixes: 5aa75ed5b9 ("io_uring: tie async worker side to the task context")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2021-02-23 12:27:49 -07:00
parent 0100e6bbdb
commit 8a378fb096
2 changed files with 5 additions and 4 deletions
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7
fs/io_uring.c
View File

@ -8800,9 +8800,10 @@ void __io_uring_files_cancel(struct files_struct *files)
if (files) {
io_uring_remove_task_files(tctx);
} else if (tctx->io_wq && current->flags & PF_EXITING) {
io_wq_destroy(tctx->io_wq);
tctx->io_wq = NULL;
if (tctx->io_wq) {
io_wq_destroy(tctx->io_wq);
tctx->io_wq = NULL;
}
}
}

2
include/linux/io_uring.h
View File

@ -43,7 +43,7 @@ static inline void io_uring_task_cancel(void)
}
static inline void io_uring_files_cancel(struct files_struct *files)
{
if (current->io_uring && !xa_empty(&current->io_uring->xa))
if (current->io_uring)
__io_uring_files_cancel(files);
}
static inline void io_uring_free(struct task_struct *tsk)