linux-kernel - [PATCH 5.15 011/230] can: m_can: m_can_{read_fifo,echo_tx_event}(): shift timestamp to full 32 bits

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Date:   Mon, 11 Jul 2022 11:04:27 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Torin Cooper-Bennun <torin@...iluxsystems.com>,
        Chandrasekar Ramakrishnan <rcsekar@...sung.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH 5.15 011/230] can: m_can: m_can_{read_fifo,echo_tx_event}(): shift timestamp to full 32 bits

From: Marc Kleine-Budde <mkl@...gutronix.de>

commit 4c3333693f07313f5f0145a922f14a7d3c0f4f21 upstream.

In commit 1be37d3b0414 ("can: m_can: fix periph RX path: use
rx-offload to ensure skbs are sent from softirq context") the RX path
for peripheral devices was switched to RX-offload.

Received CAN frames are pushed to RX-offload together with a
timestamp. RX-offload is designed to handle overflows of the timestamp
correctly, if 32 bit timestamps are provided.

The timestamps of m_can core are only 16 bits wide. So this patch
shifts them to full 32 bit before passing them to RX-offload.

Link: https://lore.kernel.org/all/20220612211410.4081390-1-mkl@pengutronix.de
Fixes: 1be37d3b0414 ("can: m_can: fix periph RX path: use rx-offload to ensure skbs are sent from softirq context")
Cc: <stable@...r.kernel.org> # 5.13
Cc: Torin Cooper-Bennun <torin@...iluxsystems.com>
Reviewed-by: Chandrasekar Ramakrishnan <rcsekar@...sung.com>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/can/m_can/m_can.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -532,7 +532,7 @@ static int m_can_read_fifo(struct net_de
 	stats->rx_packets++;
 	stats->rx_bytes += cf->len;
 
-	timestamp = FIELD_GET(RX_BUF_RXTS_MASK, fifo_header.dlc);
+	timestamp = FIELD_GET(RX_BUF_RXTS_MASK, fifo_header.dlc) << 16;
 
 	m_can_receive_skb(cdev, skb, timestamp);
 
@@ -1043,7 +1043,7 @@ static int m_can_echo_tx_event(struct ne
 		}
 
 		msg_mark = FIELD_GET(TX_EVENT_MM_MASK, txe);
-		timestamp = FIELD_GET(TX_EVENT_TXTS_MASK, txe);
+		timestamp = FIELD_GET(TX_EVENT_TXTS_MASK, txe) << 16;
 
 		/* ack txe element */
 		m_can_write(cdev, M_CAN_TXEFA, FIELD_PREP(TXEFA_EFAI_MASK,