Messages in this thread | | | From | Andi Kleen <> | Subject | Re: [PATCH] Disable Bus Master on PCI device shutdown | Date | Thu, 07 Jun 2012 10:07:29 -0700 |
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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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