From mboxrd@z Thu Jan 1 00:00:00 1970 From: mkl@pengutronix.de (Marc Kleine-Budde) Date: Fri, 10 Apr 2015 17:15:11 +0200 Subject: [REGRESSION] commit 0461a41 "spi: Pump transfers inside calling context for spi_sync()" breaks Apalis/Colibri T30 with MCP2515 SPI CAN controller In-Reply-To: <20150410132330.GH6023@sirena.org.uk> References: <1428670853.7008.87.camel@localhost.localdomain> <20150410132330.GH6023@sirena.org.uk> Message-ID: <5527E8FF.7050104@pengutronix.de> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 > > Please try to use somewhat more targetted CC lists... > >> 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? > > 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 -- 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 | -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 819 bytes Desc: OpenPGP digital signature URL: