From: Juergen Gross <jgross@xxxxxxxx>
[ 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@xxxxxxxxxx>
Fixes: 23025393dbeb3b8b3 ("xen/netback: use lateeoi irq binding")
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Acked-by: Wei Liu <wl@xxxxxxx>
Link: https://lore.kernel.org/r/20210202070938.7863-1-jgross@xxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/net/xen-netback/rx.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/net/xen-netback/rx.c b/drivers/net/xen-netback/rx.c
index 9b62f65b630e4..48e2006f96ce6 100644
--- a/drivers/net/xen-netback/rx.c
+++ b/drivers/net/xen-netback/rx.c
@@ -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;
--
2.27.0
