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io_uring/notif: disable LAZY_WAKE for linked notifs 

JIRA: https://issues.redhat.com/browse/RHEL-64867

commit 19352a1d395424b5f8c03289a85fbd6622d6601a
Author: Pavel Begunkov <asml.silence@gmail.com>
Date:   Tue Apr 30 16:42:31 2024 +0100

    io_uring/notif: disable LAZY_WAKE for linked notifs
    
    Notifications may now be linked and thus a single tw can post multiple
    CQEs, it's not safe to use LAZY_WAKE with them. Disable LAZY_WAKE for
    now, if that'd prove to be a problem we can count them and pass the
    expected number of CQEs into __io_req_task_work_add().
    
    Fixes: 6fe4220912d19 ("io_uring/notif: implement notification stacking")
    Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
    Link: https://lore.kernel.org/r/0a5accdb7d2d0d27ebec14f8106e14e0192fae17.1714488419.git.asml.silence@gmail.com
    Signed-off-by: Jens Axboe <axboe@kernel.dk>

Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
This commit is contained in:
Jeff Moyer 2024-04-30 16:42:31 +01:00
parent fe71565921
commit afb9313514
1 changed files with 4 additions and 1 deletions
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5
io_uring/notif.c
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@ -38,6 +38,7 @@ void io_tx_ubuf_complete(struct sk_buff *skb, struct ubuf_info *uarg,
{
struct io_notif_data *nd = container_of(uarg, struct io_notif_data, uarg);
struct io_kiocb *notif = cmd_to_io_kiocb(nd);
unsigned tw_flags;
if (nd->zc_report) {
if (success && !nd->zc_used && skb)
@ -53,8 +54,10 @@ void io_tx_ubuf_complete(struct sk_buff *skb, struct ubuf_info *uarg,
io_tx_ubuf_complete(skb, &nd->head->uarg, success);
return;
}
tw_flags = nd->next ? 0 : IOU_F_TWQ_LAZY_WAKE;
notif->io_task_work.func = io_notif_tw_complete;
__io_req_task_work_add(notif, IOU_F_TWQ_LAZY_WAKE);
__io_req_task_work_add(notif, tw_flags);
}
static int io_link_skb(struct sk_buff *skb, struct ubuf_info *uarg)