This is a note to let you know that I've just added the patch titled can: at91_can: RX queue could get stuck at high bus load to the 3.14-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-at91_can-rx-queue-could-get-stuck-at-high-bus-load.patch and it can be found in the queue-3.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 43200a4480cbbe660309621817f54cbb93907108 Mon Sep 17 00:00:00 2001 From: Wolfgang Grandegger <wg@xxxxxxxxxxxxxx> Date: Mon, 13 Jun 2016 15:44:19 +0200 Subject: can: at91_can: RX queue could get stuck at high bus load From: Wolfgang Grandegger <wg@xxxxxxxxxxxxxx> commit 43200a4480cbbe660309621817f54cbb93907108 upstream. At high bus load it could happen that "at91_poll()" enters with all RX message boxes filled up. If then at the end the "quota" is exceeded as well, "rx_next" will not be reset to the first RX mailbox and hence the interrupts remain disabled. Signed-off-by: Wolfgang Grandegger <wg@xxxxxxxxxxxxxx> Tested-by: Amr Bekhit <amrbekhit@xxxxxxxxx> Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/net/can/at91_can.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) --- a/drivers/net/can/at91_can.c +++ b/drivers/net/can/at91_can.c @@ -730,9 +730,10 @@ static int at91_poll_rx(struct net_devic /* upper group completed, look again in lower */ if (priv->rx_next > get_mb_rx_low_last(priv) && - quota > 0 && mb > get_mb_rx_last(priv)) { + mb > get_mb_rx_last(priv)) { priv->rx_next = get_mb_rx_first(priv); - goto again; + if (quota > 0) + goto again; } return received; Patches currently in stable-queue which might be from wg@xxxxxxxxxxxxxx are queue-3.14/can-at91_can-rx-queue-could-get-stuck-at-high-bus-load.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html