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Date: Thu, 12 Jan 2012 00:26:36 +0100 From: Alessandro Rubini <rubini@...dd.com> To: alan@...ux.intel.com Cc: linux-kernel@...r.kernel.org, giancarlo.asnaghi@...com, tglx@...utronix.de, mingo@...hat.com, hpa@...or.com, x86@...nel.org, jgarzik@...ox.com, linux-ide@...r.kernel.org Subject: Re: [PATCH 6/6] ahci: support the STA2X11 I/O Hub [I miscopied linux-ide to inux-ide in the original submission. I'm now fixing the typo. This is the original patch and I quote Alan without removing anything: https://lkml.org/lkml/2012/1/6/124 ] >> The AHCI controller found in the STA2X11 chip uses BAR number 0 >> instead of 5. Also, the chip's fixup code sets a special DMA mask >> for all of its PCI functions, and the mask must be preserved here. > > The more I look at this aspect of it the more convinced I grow that you > should handle this in the DMA ops. > > dma_supported will call ops->dma_supported which can in turn make its > own decisions and avoid driver hackery. The problem is that there's dma_capable() somewhere. Currently I have very bad feeling about dma_capable and I'll try to turn that to dma_supported as soon as possible (the code I got changed the behaviour of dma_capable, which is a global change impacting on others). thanks /alessandro -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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