From 864c17c3d83be6a1f6a2888566e93e114986abca Mon Sep 17 00:00:00 2001 From: Julian Wiedmann Date: Wed, 18 Oct 2017 17:40:23 +0200 Subject: [PATCH] s390/qeth: try harder to get packets from RX buffer Current code bails out when two subsequent buffer elements hold insufficient data to contain a qeth_hdr packet descriptor. This seems reasonable, but it would be legal for quirky hardware to leave a few elements empty and then present packets in a subsequent element. These packets would currently be dropped. So make sure to check all buffer elements, until we hit the LAST_ENTRY indication. Signed-off-by: Julian Wiedmann Signed-off-by: David S. Miller --- drivers/s390/net/qeth_core_main.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c index 23b439fb5f2c..8855bc8534d2 100644 --- a/drivers/s390/net/qeth_core_main.c +++ b/drivers/s390/net/qeth_core_main.c @@ -5214,13 +5214,11 @@ struct sk_buff *qeth_core_get_next_skb(struct qeth_card *card, int use_rx_sg = 0; /* qeth_hdr must not cross element boundaries */ - if (element->length < offset + sizeof(struct qeth_hdr)) { + while (element->length < offset + sizeof(struct qeth_hdr)) { if (qeth_is_last_sbale(element)) return NULL; element++; offset = 0; - if (element->length < sizeof(struct qeth_hdr)) - return NULL; } *hdr = element->addr + offset;