* [PATCH] can: c_can: Handle lost message before EOB
@ 2013-10-28 8:54 Markus Pargmann
2013-10-28 9:08 ` Marc Kleine-Budde
0 siblings, 1 reply; 2+ messages in thread
From: Markus Pargmann @ 2013-10-28 8:54 UTC (permalink / raw)
To: Marc Kleine-Budde, Wolfgang Grandegger
Cc: linux-can, netdev, linux-kernel, kernel, Markus Pargmann
If we handle end of block messages with higher priority than a lost
message, we can run into an endless interrupt loop.
This is reproducable with a am335x processor and "cansequence -r" at
1Mbit. As soon as we loose a packet we can't escape from a interrupt
loop.
This patch handles lost packets before EOB packets.
Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
---
drivers/net/can/c_can/c_can.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index a668cd4..e3fc07c 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -814,9 +814,6 @@ static int c_can_do_rx_poll(struct net_device *dev, int quota)
msg_ctrl_save = priv->read_reg(priv,
C_CAN_IFACE(MSGCTRL_REG, 0));
- if (msg_ctrl_save & IF_MCONT_EOB)
- return num_rx_pkts;
-
if (msg_ctrl_save & IF_MCONT_MSGLST) {
c_can_handle_lost_msg_obj(dev, 0, msg_obj);
num_rx_pkts++;
@@ -824,6 +821,9 @@ static int c_can_do_rx_poll(struct net_device *dev, int quota)
continue;
}
+ if (msg_ctrl_save & IF_MCONT_EOB)
+ return num_rx_pkts;
+
if (!(msg_ctrl_save & IF_MCONT_NEWDAT))
continue;
--
1.8.4.rc3
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] can: c_can: Handle lost message before EOB
2013-10-28 8:54 [PATCH] can: c_can: Handle lost message before EOB Markus Pargmann
@ 2013-10-28 9:08 ` Marc Kleine-Budde
0 siblings, 0 replies; 2+ messages in thread
From: Marc Kleine-Budde @ 2013-10-28 9:08 UTC (permalink / raw)
To: Markus Pargmann
Cc: Wolfgang Grandegger, linux-can, netdev, linux-kernel, kernel
[-- Attachment #1: Type: text/plain, Size: 759 bytes --]
On 10/28/2013 09:54 AM, Markus Pargmann wrote:
> If we handle end of block messages with higher priority than a lost
> message, we can run into an endless interrupt loop.
>
> This is reproducable with a am335x processor and "cansequence -r" at
> 1Mbit. As soon as we loose a packet we can't escape from a interrupt
> loop.
>
> This patch handles lost packets before EOB packets.
>
> Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Thanks, applied to can.
Marc
--
Pengutronix e.K. | Marc Kleine-Budde |
Industrial Linux Solutions | Phone: +49-231-2826-924 |
Vertretung West/Dortmund | Fax: +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de |
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2013-10-28 8:54 [PATCH] can: c_can: Handle lost message before EOB Markus Pargmann
2013-10-28 9:08 ` Marc Kleine-Budde
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