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io-wq: use proper nesting IRQ disabling spinlocks for cancel

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We don't know what context we'll be called in for cancel, it could very
well be with IRQs disabled already. Use the IRQ saving variants of the
locking primitives.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2019-11-05 13:51:51 -07:00
parent 1056ef9403
commit 6f72653e76
1 changed files with 9 additions and 6 deletions
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15
fs/io-wq.c
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@ -642,19 +642,20 @@ static bool io_work_cancel(struct io_worker *worker, void *cancel_data)
{
struct io_cb_cancel_data *data = cancel_data;
struct io_wqe *wqe = data->wqe;
unsigned long flags;
bool ret = false;
/*
* Hold the lock to avoid ->cur_work going out of scope, caller
* may deference the passed in work.
*/
spin_lock_irq(&wqe->lock);
spin_lock_irqsave(&wqe->lock, flags);
if (worker->cur_work &&
data->cancel(worker->cur_work, data->caller_data)) {
send_sig(SIGINT, worker->task, 1);
ret = true;
}
spin_unlock_irq(&wqe->lock);
spin_unlock_irqrestore(&wqe->lock, flags);
return ret;
}
@ -669,9 +670,10 @@ static enum io_wq_cancel io_wqe_cancel_cb_work(struct io_wqe *wqe,
.caller_data = cancel_data,
};
struct io_wq_work *work;
unsigned long flags;
bool found = false;
spin_lock_irq(&wqe->lock);
spin_lock_irqsave(&wqe->lock, flags);
list_for_each_entry(work, &wqe->work_list, list) {
if (cancel(work, cancel_data)) {
list_del(&work->list);
@ -679,7 +681,7 @@ static enum io_wq_cancel io_wqe_cancel_cb_work(struct io_wqe *wqe,
break;
}
}
spin_unlock_irq(&wqe->lock);
spin_unlock_irqrestore(&wqe->lock, flags);
if (found) {
work->flags |= IO_WQ_WORK_CANCEL;
@ -733,6 +735,7 @@ static enum io_wq_cancel io_wqe_cancel_work(struct io_wqe *wqe,
struct io_wq_work *cwork)
{
struct io_wq_work *work;
unsigned long flags;
bool found = false;
cwork->flags |= IO_WQ_WORK_CANCEL;
@ -742,7 +745,7 @@ static enum io_wq_cancel io_wqe_cancel_work(struct io_wqe *wqe,
* from there. CANCEL_OK means that the work is returned as-new,
* no completion will be posted for it.
*/
spin_lock_irq(&wqe->lock);
spin_lock_irqsave(&wqe->lock, flags);
list_for_each_entry(work, &wqe->work_list, list) {
if (work == cwork) {
list_del(&work->list);
@ -750,7 +753,7 @@ static enum io_wq_cancel io_wqe_cancel_work(struct io_wqe *wqe,
break;
}
}
spin_unlock_irq(&wqe->lock);
spin_unlock_irqrestore(&wqe->lock, flags);
if (found) {
work->flags |= IO_WQ_WORK_CANCEL;