Patch "can: peak/pcie_fd: remove useless code when interface starts" has been added to the 4.15-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    can: peak/pcie_fd: remove useless code when interface starts

to the 4.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     can-peak-pcie_fd-remove-useless-code-when-interface-starts.patch
and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From ffd137f7043cb30067e1bff6fe62a073ae190b23 Mon Sep 17 00:00:00 2001
From: Stephane Grosjean <s.grosjean@peak-system.com>
Date: Thu, 8 Mar 2018 09:30:29 +0100
Subject: can: peak/pcie_fd: remove useless code when interface starts

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;
 	}


Patches currently in stable-queue which might be from s.grosjean@peak-system.com are

queue-4.15/can-peak-pcie_fd-fix-echo_skb-is-occupied-bug.patch
queue-4.15/can-peak-pcie_fd-remove-useless-code-when-interface-starts.patch