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xen-netfront: do not cast grant table reference to signed short 

While grant reference is of type uint32_t, xen-netfront erroneously casts
it to signed short in BUG_ON().

This would lead to the xen domU panic during boot-up or migration when it
is attached with lots of paravirtual devices.

Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dongli Zhang 2016-10-31 13:38:29 +08:00 committed by David S. Miller
parent df67e97a28
commit 87557efc27
1 changed files with 2 additions and 2 deletions
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4
drivers/net/xen-netfront.c
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@ -304,7 +304,7 @@ static void xennet_alloc_rx_buffers(struct netfront_queue *queue)
queue->rx_skbs[id] = skb;
ref = gnttab_claim_grant_reference(&queue->gref_rx_head);
BUG_ON((signed short)ref < 0);
WARN_ON_ONCE(IS_ERR_VALUE((unsigned long)ref));
queue->grant_rx_ref[id] = ref;
page = skb_frag_page(&skb_shinfo(skb)->frags[0]);
@ -428,7 +428,7 @@ static void xennet_tx_setup_grant(unsigned long gfn, unsigned int offset,
id = get_id_from_freelist(&queue->tx_skb_freelist, queue->tx_skbs);
tx = RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++);
ref = gnttab_claim_grant_reference(&queue->gref_tx_head);
BUG_ON((signed short)ref < 0);
WARN_ON_ONCE(IS_ERR_VALUE((unsigned long)ref));
gnttab_grant_foreign_access_ref(ref, queue->info->xbdev->otherend_id,
gfn, GNTMAP_readonly);