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SubjectRe: [PATCH] Disable Bus Master on PCI device shutdown
Date
Alan Cox <alan@lxorguk.ukuu.org.uk> writes:

>> This protects against the case where a piece of hardware is continuing
>> to DMA even after the driver shutdown method has been called? I'm not
>
> It doesn't. We also have hardware which craps itself if you clear the bus
> mastering bit and we have platforms where the BIOS gets most upset if you
> do that on suspend paths. There are also lots of devices that simply
> ignore the bus mastering bit !

But it also makes my system do kexec successfully for the first time.

Maybe can make it an option.

n-Andi

--
ak@linux.intel.com -- Speaking for myself only


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