From: Marc Kleine-Budde <mkl@pengutronix.de>
Date: Wed, 9 Oct 2019 15:15:07 +0200
Subject: can: rx-offload: can_rx_offload_offload_one(): increment
 rx_fifo_errors on queue overflow or OOM
Git-commit: 4e9016bee3bf0c24963097edace034ff205b565c
Patch-mainline: 5.4-rc7
References: bnc#1151927 5.3.15

If the rx-offload skb_queue is full or the skb allocation fails (due to OOM),
the mailbox contents is discarded.

This patch adds the incrementing of the rx_fifo_errors statistics counter.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 drivers/net/can/rx-offload.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/net/can/rx-offload.c
+++ b/drivers/net/can/rx-offload.c
@@ -125,8 +125,10 @@ static struct sk_buff *can_rx_offload_of
 
 		ret = offload->mailbox_read(offload, &cf_overflow,
 					    &timestamp, n);
-		if (ret)
+		if (ret) {
 			offload->dev->stats.rx_dropped++;
+			offload->dev->stats.rx_fifo_errors++;
+		}
 
 		return NULL;
 	}