s390/qeth: cancel RX reclaim work earlier

When qeth's napi poll code fails to refill an entirely empty RX ring, it
kicks off buffer_reclaim_work to try again later.

Make sure that this worker is cancelled when setting the qeth device
offline. Otherwise a RX refill action can unexpectedly end up running
concurrently to bigger re-configurations (eg. resizing the buffer pool),
without any locking.

Fixes: b333293058aa ("qeth: add support for af_iucv HiperSockets transport")
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 d8f0c61..a599801 100644 (file)
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -2392,7 +2392,6 @@ static void qeth_free_qdio_queues(struct qeth_card *card)
                return;
 
        qeth_free_cq(card);
-       cancel_delayed_work_sync(&card->buffer_reclaim_work);
        for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; ++j) {
                if (card->qdio.in_q->bufs[j].rx_skb)
                        dev_kfree_skb_any(card->qdio.in_q->bufs[j].rx_skb);

diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index 9972d96..8fb2937 100644 (file)
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -284,6 +284,7 @@ static void qeth_l2_stop_card(struct qeth_card *card)
        if (card->state == CARD_STATE_SOFTSETUP) {
                qeth_clear_ipacmd_list(card);
                qeth_drain_output_queues(card);
+               cancel_delayed_work_sync(&card->buffer_reclaim_work);
                card->state = CARD_STATE_DOWN;
        }
 

diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index 317d566..82f800d 100644 (file)
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -1178,6 +1178,7 @@ static void qeth_l3_stop_card(struct qeth_card *card)
                qeth_l3_clear_ip_htable(card, 1);
                qeth_clear_ipacmd_list(card);
                qeth_drain_output_queues(card);
+               cancel_delayed_work_sync(&card->buffer_reclaim_work);
                card->state = CARD_STATE_DOWN;
        }