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Subject[PATCH 5.3 057/135] can: rx-offload: can_rx_offload_irq_offload_timestamp(): continue on error
From: Jeroen Hofstee <>

[ Upstream commit c2a9f74c9d18acfdcabd3361adc7eac82c537a66 ]

In case of a resource shortage, i.e. the rx_offload queue will overflow
or a skb fails to be allocated (due to OOM),
can_rx_offload_offload_one() will call mailbox_read() to discard the
mailbox and return an ERR_PTR.

However can_rx_offload_irq_offload_timestamp() bails out in the error
case. In case of a resource shortage all mailboxes should be discarded,
to avoid an IRQ storm and give the system some time to recover.

Since can_rx_offload_irq_offload_timestamp() is typically called from a
while loop, all message will eventually be discarded. So let's continue
on error instead to discard them directly.

Signed-off-by: Jeroen Hofstee <>
Signed-off-by: Marc Kleine-Budde <>
Signed-off-by: Sasha Levin <>
drivers/net/can/rx-offload.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/can/rx-offload.c b/drivers/net/can/rx-offload.c
index 3f5e040f0c712..2ea8676579a9c 100644
--- a/drivers/net/can/rx-offload.c
+++ b/drivers/net/can/rx-offload.c
@@ -216,7 +216,7 @@ int can_rx_offload_irq_offload_timestamp(struct can_rx_offload *offload, u64 pen

skb = can_rx_offload_offload_one(offload, i);
if (IS_ERR_OR_NULL(skb))
- break;
+ continue;

__skb_queue_add_sort(&skb_queue, skb, can_rx_offload_compare);

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