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xen/netback: avoid race in xenvif_rx_ring_slots_available()

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[ Upstream commit ec7d8e7dd3a59528e305a18e93f1cb98f7faf83b ]

Since commit 23025393dbeb3b8b3 ("xen/netback: use lateeoi irq binding")
xenvif_rx_ring_slots_available() is no longer called only from the rx
queue kernel thread, so it needs to access the rx queue with the
associated queue held.

Reported-by: Igor Druzhinin <igor.druzhinin@citrix.com>
Fixes: 23025393dbeb3b8b3 ("xen/netback: use lateeoi irq binding")
Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Wei Liu <wl@xen.org>
Link: https://lore.kernel.org/r/20210202070938.7863-1-jgross@suse.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Juergen Gross 2021-02-02 08:09:38 +01:00 • committed by Greg Kroah-Hartman
commit 71d2bd7921
1 changed files with 8 additions and 1 deletions
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9
drivers/net/xen-netback/rx.c
View file

@ -38,10 +38,15 @@ static bool xenvif_rx_ring_slots_available(struct xenvif_queue *queue)
RING_IDX prod, cons;
struct sk_buff *skb;
int needed;
unsigned long flags;
spin_lock_irqsave(&queue->rx_queue.lock, flags);
skb = skb_peek(&queue->rx_queue);
if (!skb)
if (!skb) {
spin_unlock_irqrestore(&queue->rx_queue.lock, flags);
return false;
}
needed = DIV_ROUND_UP(skb->len, XEN_PAGE_SIZE);
if (skb_is_gso(skb))
@ -49,6 +54,8 @@ static bool xenvif_rx_ring_slots_available(struct xenvif_queue *queue)
if (skb->sw_hash)
needed++;
spin_unlock_irqrestore(&queue->rx_queue.lock, flags);
do {
prod = queue->rx.sring->req_prod;
cons = queue->rx.req_cons;