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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Stephane Grosjean <s.grosjean@peak-system.com>,
        Marc Kleine-Budde <mkl@pengutronix.de>
Subject: [PATCH 4.15 076/105] can: peak/pcie_fd: remove useless code when interface starts
Date:   Tue, 27 Mar 2018 18:27:56 +0200
Message-Id: <20180327162802.613560973@linuxfoundation.org>
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4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stephane Grosjean <s.grosjean@peak-system.com>

commit ffd137f7043cb30067e1bff6fe62a073ae190b23 upstream.

When an interface starts, the echo_skb array is empty and the network
queue should be started only. This patch replaces useless code and locks
when the internal RX_BARRIER message is received from the IP core, telling
the driver that tx may start.

Signed-off-by: Stephane Grosjean <s.grosjean@peak-system.com>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/net/can/peak_canfd/peak_canfd.c |   13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

--- a/drivers/net/can/peak_canfd/peak_canfd.c
+++ b/drivers/net/can/peak_canfd/peak_canfd.c
@@ -333,7 +333,6 @@ static int pucan_handle_status(struct pe
 
 	/* this STATUS is the CNF of the RX_BARRIER: Tx path can be setup */
 	if (pucan_status_is_rx_barrier(msg)) {
-		unsigned long flags;
 
 		if (priv->enable_tx_path) {
 			int err = priv->enable_tx_path(priv);
@@ -342,16 +341,8 @@ static int pucan_handle_status(struct pe
 				return err;
 		}
 
-		/* restart network queue only if echo skb array is free */
-		spin_lock_irqsave(&priv->echo_lock, flags);
-
-		if (!priv->can.echo_skb[priv->echo_idx]) {
-			spin_unlock_irqrestore(&priv->echo_lock, flags);
-
-			netif_wake_queue(ndev);
-		} else {
-			spin_unlock_irqrestore(&priv->echo_lock, flags);
-		}
+		/* start network queue (echo_skb array is empty) */
+		netif_start_queue(ndev);
 
 		return 0;
 	}