This is a note to let you know that I've just added the patch titled
s390/qeth: fix notification for pending buffers during teardown
to the 5.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
s390-qeth-fix-notification-for-pending-buffers-during-teardown.patch
and it can be found in the queue-5.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7eefda7f353ef86ad82a2dc8329e8a3538c08ab6 Mon Sep 17 00:00:00 2001
From: Julian Wiedmann <jwi@xxxxxxxxxxxxx>
Date: Tue, 9 Mar 2021 17:52:21 +0100
Subject: s390/qeth: fix notification for pending buffers during teardown
From: Julian Wiedmann <jwi@xxxxxxxxxxxxx>
commit 7eefda7f353ef86ad82a2dc8329e8a3538c08ab6 upstream.
The cited commit reworked the state machine for pending TX buffers.
In qeth_iqd_tx_complete() it turned PENDING into a transient state, and
uses NEED_QAOB for buffers that get parked while waiting for their QAOB
completion.
But it missed to adjust the check in qeth_tx_complete_buf(). So if
qeth_tx_complete_pending_bufs() is called during teardown to drain
the parked TX buffers, we no longer raise a notification for af_iucv.
Instead of updating the checked state, just move this code into
qeth_tx_complete_pending_bufs() itself. This also gets rid of the
special-case in the common TX completion path.
Fixes: 8908f36d20d8 ("s390/qeth: fix af_iucv notification race")
Signed-off-by: Julian Wiedmann <jwi@xxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/s390/net/qeth_core_main.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -1386,9 +1386,6 @@ static void qeth_tx_complete_buf(struct
struct qeth_qdio_out_q *queue = buf->q;
struct sk_buff *skb;
- if (atomic_read(&buf->state) == QETH_QDIO_BUF_PENDING)
- qeth_notify_skbs(queue, buf, TX_NOTIFY_GENERALERROR);
-
/* Empty buffer? */
if (buf->next_element_to_fill == 0)
return;
@@ -1461,6 +1458,9 @@ static void qeth_tx_complete_pending_buf
QETH_CARD_TEXT(card, 5, "fp");
QETH_CARD_TEXT_(card, 5, "%lx", (long) buf);
+ if (drain)
+ qeth_notify_skbs(queue, buf,
+ TX_NOTIFY_GENERALERROR);
qeth_tx_complete_buf(buf, drain, 0);
list_del(&buf->list_entry);
Patches currently in stable-queue which might be from jwi@xxxxxxxxxxxxx are
queue-5.11/s390-qeth-improve-completion-of-pending-tx-buffers.patch
queue-5.11/s390-qeth-schedule-tx-napi-on-qaob-completion.patch
queue-5.11/s390-qeth-fix-notification-for-pending-buffers-during-teardown.patch
queue-5.11/s390-qeth-fix-memory-leak-after-failed-tx-buffer-allocation.patch
