linux-kernel - Re: Regression in 2.6.24-rc3 - 64-bit DMA fails for BCM94311MCG rev 02

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Date:	Sun, 18 Nov 2007 16:17:27 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Larry Finger <Larry.Finger@...inger.net>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: Regression in 2.6.24-rc3 - 64-bit DMA fails for BCM94311MCG rev
 02

On Sun, 18 Nov 2007 18:04:51 -0600
Larry Finger <Larry.Finger@...inger.net> wrote:

> I get a failure of 64-bit DMA on a BCM94311MCG rev 02 wireless
> interface running on x86_64 using an AMD Turion 64 X2 processor on an
> HP Pavilion dv2125nr laptop. The error code indicates that the
> interface is getting a descriptor read error, even though the
> descriptor ring and all the DMA buffers have been checked when
> allocated. This particular card version is newly supported; however,
> it was working correctly on 2.6.24-rc2.
> 


worth adding a pci_set_dma_mask(pdev, DMA_32BIT_MASK); in the driver,
just after pci_enable_device(); (also check if there's other
pci_set_dma_mask functions, to make sure it doesn't get set back to 64
bit)


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