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

can: peak/pcie_fd: fix potential bug in restarting tx queue

to the 4.14-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-fix-potential-bug-in-restarting-tx-queue.patch and it can be found in the queue-4.14 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 91785de6f94b58c3fb6664609e3682f011bd28d2 Mon Sep 17 00:00:00 2001

From: Stephane Grosjean s.grosjean@peak-system.com Date: Thu, 7 Dec 2017 16:13:43 +0100 Subject: can: peak/pcie_fd: fix potential bug in restarting tx queue

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

commit 91785de6f94b58c3fb6664609e3682f011bd28d2 upstream.

Don't rely on can_get_echo_skb() return value to wake the network tx queue up: can_get_echo_skb() returns 0 if the echo array slot was not occupied, but also when the DLC of the released echo frame was 0.

Signed-off-by: Stephane Grosjean s.grosjean@peak-system.com 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 | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-)

--- a/drivers/net/can/peak_canfd/peak_canfd.c +++ b/drivers/net/can/peak_canfd/peak_canfd.c @@ -258,21 +258,18 @@ static int pucan_handle_can_rx(struct pe /* if this frame is an echo, */ if ((rx_msg_flags & PUCAN_MSG_LOOPED_BACK) && !(rx_msg_flags & PUCAN_MSG_SELF_RECEIVE)) { - int n; unsigned long flags;

spin_lock_irqsave(&priv->echo_lock, flags); - n = can_get_echo_skb(priv->ndev, msg->client); + can_get_echo_skb(priv->ndev, msg->client); spin_unlock_irqrestore(&priv->echo_lock, flags);

/* count bytes of the echo instead of skb */ stats->tx_bytes += cf_len; stats->tx_packets++;

- if (n) { - /* restart tx queue only if a slot is free */ - netif_wake_queue(priv->ndev); - } + /* restart tx queue (a slot is free) */ + netif_wake_queue(priv->ndev);

return 0; }

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

queue-4.14/can-peak-pcie_fd-fix-potential-bug-in-restarting-tx-queue.patch queue-4.14/can-peak-pci-fix-potential-bug-when-probe-fails.patch