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 4.4-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-4.4 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
@@ -712,9 +712,10 @@ 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-4.4/can-at91_can-rx-queue-could-get-stuck-at-high-bus-load.patch
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