netdev - Re: [PATCH net-next-2.6] can: mcp251x: Move to threaded interrupts instead of workqueues.

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Date:	Sun, 31 Jan 2010 18:39:35 +0100
From:	christian pellegrin <chripell@...e.org>
To:	Wolfgang Grandegger <wg@...ndegger.com>
Cc:	socketcan-core@...ts.berlios.de, netdev@...r.kernel.org
Subject: Re: [PATCH net-next-2.6] can: mcp251x: Move to threaded interrupts 
	instead of workqueues.

On Sat, Jan 30, 2010 at 8:49 PM, Wolfgang Grandegger <wg@...ndegger.com> wrote:
> Hi Christian,
>

Hi,

>
> Could you please truncate the lines to the usual 72 (or 80) characters
> per line?
>

ack, just reconfigured nano!

>> +static irqreturn_t mcp251x_can_ist(int irq, void *dev_id);
>> +static void mcp251x_restart_work_handler(struct work_struct *ws);
>> +static void mcp251x_tx_work_handler(struct work_struct *ws);
>
> Any chance to get rid of these forward declarations (by reordering them)?
>

ack, I was trying to minimize patch size so the reason for not moving
code. I fixed it.

>> +              * This message is worrisome (because it points out
>> +              * something wrong with locking logic) if seen when
>> +              * there is no bus-off recovery going on.
>> +              */
>
> Before it calls netif_carrier_on, it calls the drivers "do_set_mode"
> callback. See:
>
> http://lxr.linux.no/#linux+v2.6.32/drivers/net/can/dev.c#L383
>
> Is there a way to clear the TX logic in the "do_set_mode" callback?
>

ack, sorry saw this just now

>> +             dev_info(&net->dev,
>> +                      "cannot allocate error skb\n");
>
> dev_err?
>

ack

>>               if (priv->can.state == CAN_STATE_BUS_OFF) {
>>                       mcp251x_clean(net);
>>                       netif_wake_queue(net);
>> -                     return;
>> +                     goto restart_work_unlock;
>>               }
>
>                } else { ? To get rid of the label.
>

ack. I realized that netif_wake_queue here is wrong too or at least
meaningless: the carrier of the can network interface is declared down
so we shouldn't reschedule the tx queue anyway. I took it out and
retested without it.

-- 
Christian Pellegrin, see http://www.evolware.org/chri/
"Real Programmers don't play tennis, or any other sport which requires
you to change clothes. Mountain climbing is OK, and Real Programmers
wear their climbing boots to work in case a mountain should suddenly
spring up in the middle of the computer room."
--
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