linux-kernel - Re: [PATCH v2] can: c_can: Speed up rx

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Message-ID: <1383035461.2713.1.camel@joe-AO722>
Date:	Tue, 29 Oct 2013 01:31:01 -0700
From:	Joe Perches <joe@...ches.com>
To:	Markus Pargmann <mpa@...gutronix.de>
Cc:	Marc Kleine-Budde <mkl@...gutronix.de>,
	Wolfgang Grandegger <wg@...ndegger.com>,
	linux-can@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel@...gutronix.de
Subject: Re: [PATCH v2] can: c_can: Speed up rx_poll function

On Tue, 2013-10-29 at 09:27 +0100, Markus Pargmann wrote:
> This patch speeds up the rx_poll function by reducing the number of
> register reads.
[]
> The third change is to replace the for-loop by a find_next_bit loop.

You need to update the commit message.

> diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
[]
> @@ -798,17 +798,19 @@ static int c_can_do_rx_poll(struct net_device *dev, int quota)
[]
> +	while (quota > 0 && (val = priv->read_reg(priv, C_CAN_INTPND1_REG))) {
> +		while ((msg_obj = ffs(val)) && quota > 0) {
> +			val &= ~BIT(msg_obj - 1);



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