netdev - [PATCH 1/2] can: cc770: Fix stalls on rt-linux, remove redundant IRQ ack

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Message-Id: <20180314120523.2295-2-mkl@pengutronix.de>
Date:   Wed, 14 Mar 2018 13:05:22 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, linux-can@...r.kernel.org,
        kernel@...gutronix.de, Andri Yngvason <andri.yngvason@...el.com>,
        linux-stable <stable@...r.kernel.org>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH 1/2] can: cc770: Fix stalls on rt-linux, remove redundant IRQ ack

From: Andri Yngvason <andri.yngvason@...el.com>

This has been reported to cause stalls on rt-linux.

Suggested-by: Richard Weinberger <richard@....at>
Tested-by: Richard Weinberger <richard@....at>
Signed-off-by: Andri Yngvason <andri.yngvason@...el.com>
Cc: linux-stable <stable@...r.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/cc770/cc770.c | 15 ---------------
 1 file changed, 15 deletions(-)

diff --git a/drivers/net/can/cc770/cc770.c b/drivers/net/can/cc770/cc770.c
index 1e37313054f3..9fed163262e0 100644
--- a/drivers/net/can/cc770/cc770.c
+++ b/drivers/net/can/cc770/cc770.c
@@ -447,15 +447,6 @@ static netdev_tx_t cc770_start_xmit(struct sk_buff *skb, struct net_device *dev)
 
 	stats->tx_bytes += dlc;
 
-
-	/*
-	 * HM: We had some cases of repeated IRQs so make sure the
-	 * INT is acknowledged I know it's already further up, but
-	 * doing again fixed the issue
-	 */
-	cc770_write_reg(priv, msgobj[mo].ctrl0,
-			MSGVAL_UNC | TXIE_UNC | RXIE_UNC | INTPND_RES);
-
 	return NETDEV_TX_OK;
 }
 
@@ -684,12 +675,6 @@ static void cc770_tx_interrupt(struct net_device *dev, unsigned int o)
 	/* Nothing more to send, switch off interrupts */
 	cc770_write_reg(priv, msgobj[mo].ctrl0,
 			MSGVAL_RES | TXIE_RES | RXIE_RES | INTPND_RES);
-	/*
-	 * We had some cases of repeated IRQ so make sure the
-	 * INT is acknowledged
-	 */
-	cc770_write_reg(priv, msgobj[mo].ctrl0,
-			MSGVAL_UNC | TXIE_UNC | RXIE_UNC | INTPND_RES);
 
 	stats->tx_packets++;
 	can_get_echo_skb(dev, 0);
-- 
2.16.1