Re: DMA issue with USB devices

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On Wed, Nov 18, 2009 at 04:07:56PM -0600, Asim wrote:
> Hi,
> 
> I realize there is an issue with PCI devices due to the possibilities
> of  a bad DMA due to a bad driver/device.

What specific issue are you referring to?

> Does this problem manifest to USB drivers as well or does the usb core
> ensure that the DMA addresses are always mapped correctly? Can anyone
> point me to the code file where this is being done.

USB host controllers are PCI devices on most systems, so the issue
should be the same, right?  On their own, USB drivers do not do DMA.

thanks,

greg k-h

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