From: Jeroen Hofstee jhofstee@victronenergy.com
[ 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 jhofstee@victronenergy.com Signed-off-by: Marc Kleine-Budde mkl@pengutronix.de Signed-off-by: Sasha Levin sashal@kernel.org --- 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 1b3ce70c55bc7..0dded7a1067bb 100644 --- a/drivers/net/can/rx-offload.c +++ b/drivers/net/can/rx-offload.c @@ -225,7 +225,7 @@ 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); }