From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marc Kleine-Budde <mkl@pengutronix.de>
Subject: Re: [REGRESSION] commit 0461a41 "spi: Pump transfers inside
 calling context for spi_sync()" breaks Apalis/Colibri T30 with MCP2515
 SPI CAN controller
Date: Fri, 10 Apr 2015 17:15:11 +0200
Message-ID: <5527E8FF.7050104@pengutronix.de>
References: <1428670853.7008.87.camel@localhost.localdomain> <20150410132330.GH6023@sirena.org.uk>
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Cc: linux-can@vger.kernel.org, linux-spi@vger.kernel.org,
	linux@arm.linux.org.uk, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org,
	Laxman Dewangan <ldewangan@nvidia.com>,
	Oliver Hartkopp <socketcan@hartkopp.net>,
	Wolfgang Grandegger <wg@grandegger.com>,
	Thierry Reding <thierry.reding@gmail.com>,
	Stephen Warren <swarren@wwwdotorg.org>,
	Alexandre Courbot <gnurou@gmail.com>,
	Stefan Agner <stefan@agner.ch>,
	Himangi Saraogi <himangi774@gmail.com>,
	Julia Lawall <julia.lawall@lip6.fr>,
	Stefano Babic <sbabic@denx.de>,
	Christian Pellegrin <chripell@fsfe.org>,
	"DavidS.Miller" <davem@davemloft.net>,
	Marc Zyngier <maz@misterjones.org>,
	Sascha Hauer <s.hauer@pengutronix.de>
To: Mark Brown <broonie@kernel.org>,
	Marcel Ziswiler <marcel@ziswiler.com>
Return-path: <linux-can-owner@vger.kernel.org>
In-Reply-To: <20150410132330.GH6023@sirena.org.uk>
Sender: linux-can-owner@vger.kernel.org
List-Id: linux-spi.vger.kernel.org

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On 04/10/2015 03:23 PM, Mark Brown wrote:
> On Fri, Apr 10, 2015 at 03:00:53PM +0200, Marcel Ziswiler wrote:
>> Hi there
>=20
> Please try to use somewhat more targetted CC lists...
>=20
>> I also have not yet looked further into what exactly is happening and
>> whether or not the SPI stack, the Tegra SPI controller driver or the
>> MCP2515 SPI CAN driver is to blame but rather decided to ask Mr. Brown=

>> and the community first for any insights they might have to share.
>> Anybody?
>=20
> I'd ask for trace logs but obviously we can't turn them on until boot
> has finished...  Adding some trace in the relevant bits of code to try
> to see where it's deadlocking is the obvious first step.

FWIW: the mcp2515 driver is accessing the SPI bus during probe(). Seems
you have to instrument the SPI stack and/or host driver.

Marc

--=20
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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