linux-kernel - is_device_dma

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Message-ID: <2e115de50906160024r7c3140d6sc8744e4362d36ef8@mail.gmail.com>
Date:	Tue, 16 Jun 2009 16:54:24 +0930
From:	Malcom Blaney <malcolm.blaney@...tek.com.au>
To:	linux-kernel@...r.kernel.org
Subject: is_device_dma_capable

Hello,

I'm using the parport_pc driver with a dma buffer, which is provided
by calling dma_alloc_coherent in arch/x86/include/asm/dma-mapping.h.

This is no longer working for me in 2.6.29.2, the previous version I
was using is 2.6.25.10, which was fine with the same hardware.

The problem is that the call to is_device_dma_capable returns false,
so dma_alloc_coherent returns NULL. Do I need to set the dma_mask in
the driver for this to work correctly?

thanks,
Malcolm.
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