From mboxrd@z Thu Jan 1 00:00:00 1970 From: r.schwebel@pengutronix.de (Robert Schwebel) Date: Thu, 14 Apr 2011 20:36:13 +0200 Subject: i.MX27 SPI tx fifo underrun In-Reply-To: References: Message-ID: <20110414183613.GH3811@pengutronix.de> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Thu, Apr 14, 2011 at 05:29:57PM +0200, Jurgen Braam wrote: > while trying to write to an at25 eeprom connected via SPI on an > i.MX27, I ran into a TX FIFO underrun. In spi_imx_isr() the variable > spi_imx->txfifo gets rather large as a result of an unsigned integer > underflow, resulting in a feels-like-endless loop. > > The following patch fixes the problem in our case: > > --- a/drivers/spi/spi_imx.c > +++ b/drivers/spi/spi_imx.c > @@ -407,7 +407,7 @@ static void __maybe_unused Please add your Signed-off-by: when sending patches. rsc -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |