From cde46035161d677617983177e877c87d89fbb5e1 Mon Sep 17 00:00:00 2001 From: Frank Blaschka Date: Wed, 29 Aug 2007 11:26:53 +0200 Subject: [PATCH] qeth: enforce a rate limit for inbound scatter gather messages under memory pressure scatter gather mode switching messages must be rate limited. Signed-off-by: Frank Blaschka Signed-off-by: Ursula Braun Signed-off-by: Jeff Garzik --- drivers/s390/net/qeth_main.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/drivers/s390/net/qeth_main.c b/drivers/s390/net/qeth_main.c index ba10d42..610d27c 100644 --- a/drivers/s390/net/qeth_main.c +++ b/drivers/s390/net/qeth_main.c @@ -2803,13 +2803,16 @@ qeth_queue_input_buffer(struct qeth_card *card, int index) if (newcount < count) { /* we are in memory shortage so we switch back to traditional skb allocation and drop packages */ - if (atomic_cmpxchg(&card->force_alloc_skb, 0, 1)) - printk(KERN_WARNING - "qeth: switch to alloc skb\n"); + if (!atomic_read(&card->force_alloc_skb) && + net_ratelimit()) + PRINT_WARN("Switch to alloc skb\n"); + atomic_set(&card->force_alloc_skb, 3); count = newcount; } else { - if (atomic_cmpxchg(&card->force_alloc_skb, 1, 0)) - printk(KERN_WARNING "qeth: switch to sg\n"); + if ((atomic_read(&card->force_alloc_skb) == 1) && + net_ratelimit()) + PRINT_WARN("Switch to sg\n"); + atomic_add_unless(&card->force_alloc_skb, -1, 0); } /* -- 2.7.4