linux-kernel - Re: [PATCH net-next-2.6 v3] can: Topcliff: PCH

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Message-ID: <003201cb8a02$f05b15e0$66f8800a@maildom.okisemi.com>
Date:	Mon, 22 Nov 2010 14:05:52 +0900
From:	"Tomoya MORINAGA" <tomoya-linux@....okisemi.com>
To:	"Marc Kleine-Budde" <mkl@...gutronix.de>
Cc:	<andrew.chih.howe.khor@...el.com>,
	"Masayuki Ohtake" <masa-korg@....okisemi.com>,
	"Samuel Ortiz" <sameo@...ux.intel.com>, <margie.foster@...el.com>,
	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<socketcan-core@...ts.berlios.de>, <yong.y.wang@...el.com>,
	<kok.howg.ewe@...el.com>,
	"Wolfgang Grandegger" <wg@...ndegger.com>, <joel.clark@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	"Christian Pellegrin" <chripell@...e.org>, <qi.wang@...el.com>
Subject: Re: [PATCH net-next-2.6 v3] can: Topcliff: PCH_CAN driver: Add Flow control,

On Friday, November 19, 2010 6:20 PM,  Marc Kleine-Budde wrote :

>>>> - spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);
>>>> + pch_can_rw_msg_obj(&priv->regs->ifregs[1].creq, tx_obj_no);
>>> Still we have the busy waiting in the TX path. Maybe you can move the
>>> waiting before accessing the if[1] and remove the busy waiting here.
>> I can't understand your saying.
>> For transmitting data, calling pch_can_rw_msg_obj is mandatory.
>Yes, but the busy wait is not needed. It should be enough to do the
>busy-waiting _before_ accessing the if[1].

Do you mean we should create other pch_can_rw_msg_obj which doesn't have busy wait ?

---
Thanks,

Tomoya MORINAGA
OKI SEMICONDUCTOR CO., LTD.
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