linux-kernel - Re: Hit BUG_ON in dma-mapping.c:425

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Message-ID: <20110105165551.GE8638@n2100.arm.linux.org.uk>
Date:	Wed, 5 Jan 2011 16:55:51 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Nicolas Ferre <nicolas.ferre@...el.com>
Cc:	"'linux-arm-kernel@...ts.infradead.org'" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Andrew Victor <linux@...im.org.za>,
	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
	Hong XU <hong.xu@...el.com>,
	Patrice VILCHEZ <patrice.vilchez@...el.com>
Subject: Re: Hit BUG_ON in dma-mapping.c:425

On Wed, Jan 05, 2011 at 05:49:12PM +0100, Nicolas Ferre wrote:
> Hi,
> 
> While running mtd_stresstest on a dataflash (atmel_spi 
> + mtd_dataflash drivers) I hit the BUG_ON directive that 
> is at the beginning of ___dma_single_cpu_to_dev() function.
> This function is called from the SPI driver that do a 
> dma_map_single() before DMA operations on the buffer 
> transmitted from upper layers.
> 
> It seems that this address is above "high_memory" limit because 
> it is allocated by vmalloc (in mtd_stresstest.c:285)...

Well, its telling you is that you're not allowed to DMA to vmalloc
addresses.  Whether that's the fault of the map driver or not is a
question for mtd folk.
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