svn commit: r200121 - head/sys/dev/ata
mav at FreeBSD.org
Tue Dec 8 14:36:33 UTC 2009
Pawel Jakub Dawidek wrote:
> On Sat, Dec 05, 2009 at 01:40:51PM +0000, Alexander Motin wrote:
>> Author: mav
>> Date: Sat Dec 5 13:40:51 2009
>> New Revision: 200121
>> URL: http://svn.freebsd.org/changeset/base/200121
>> Do not ignore device interrupt if bus mastering is still active. It is
>> normal in case of media read error and some ATAPI cases, when transfer size
>> is unknown beforehand. PCI ATA BM specification tells that in case of such
>> underrun driver should just manually stop DMA engine. DMA engine should
>> same time guarantie that all bus mastering transfers completed at the moment
>> of driver reads interrupt flag asserted.
>> This change should fix interrupt storms and command timeouts in many cases.
>> PR: kern/103602, sparc64/121539, kern/133122, kern/139654
> I've a box where I see interrupt storm on. This is 8-STABLE with this
> patch applied.
Pawel found that it was not ATA issue, but USB. Fixed.
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