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%3Ba=su...

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