Date: Mon, 2 Aug 2004 13:00:38 -0700 (PDT) From: Matthew Dillon <dillon@apollo.backplane.com> To: =?ISO-8859-1?Q?S=F8ren_Schmidt?= <sos@DeepCore.dk> Cc: Ville-Pertti Keinonen <will+freebsd-current@will.iki.fi> Subject: Re: ATA driver races with interrupts Message-ID: <200408022000.i72K0cWU002698@apollo.backplane.com> References: <410E688D.7020709@will.iki.fi> <410E74F7.1070000@will.iki.fi> <20040802132802.3d7kgoow0c80ss0s@www.sweetdreamsracing.biz> <410E7B8B.3080407@will.iki.fi> <410E81B8.1000206@DeepCore.dk>
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I should also note that there seems to be an assumption (at least in 4.x) that no ATA interrupt will occur once the ATA interrupt is masked. The problem with this assumption is that the ATA interrupt could have already occured and been queued/delayed due to a mutex, Giant, or other mechanism, just prior to the device interrupt being masked. It is exactly the same problem that one has with shared device interrupts so hopefully solving the shared device interrupt case will also solve the interrupt masking race case. -Matt
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