release/5.2.30/can-rx-offload-can_rx_offload_offload_one-increment-.patch

From 87675aca8f07dd1ef4f5613dcf229deb50cbc6dc Mon Sep 17 00:00:00 2001
From: Marc Kleine-Budde <mkl@pengutronix.de>
Date: Wed, 9 Oct 2019 15:15:07 +0200
Subject: [PATCH] can: rx-offload: can_rx_offload_offload_one(): increment
 rx_fifo_errors on queue overflow or OOM

commit 4e9016bee3bf0c24963097edace034ff205b565c upstream.

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: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/drivers/net/can/rx-offload.c b/drivers/net/can/rx-offload.c
index bdc27481b57f..e224530a0630 100644
--- 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_offload_one(struct can_rx_offload *offload
 
 		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;
 	}
-- 
2.7.4