* FAILED: patch "[PATCH] s390/qeth: fix notification for pending buffers during" failed to apply to 5.4-stable tree
@ 2021-03-12 12:55 gregkh
0 siblings, 0 replies; only message in thread
From: gregkh @ 2021-03-12 12:55 UTC (permalink / raw)
To: jwi, davem; +Cc: stable
The patch below does not apply to the 5.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 7eefda7f353ef86ad82a2dc8329e8a3538c08ab6 Mon Sep 17 00:00:00 2001
From: Julian Wiedmann <jwi@linux.ibm.com>
Date: Tue, 9 Mar 2021 17:52:21 +0100
Subject: [PATCH] s390/qeth: fix notification for pending buffers during
teardown
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@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index d0a56afec028..a814698387bc 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -1390,9 +1390,6 @@ static void qeth_tx_complete_buf(struct qeth_qdio_out_buffer *buf, bool error,
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;
@@ -1465,6 +1462,9 @@ static void qeth_tx_complete_pending_bufs(struct qeth_card *card,
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);
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2021-03-12 12:55 FAILED: patch "[PATCH] s390/qeth: fix notification for pending buffers during" failed to apply to 5.4-stable tree gregkh
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