Messages in this thread | | | Date | Wed, 29 Nov 2006 00:50:43 +0100 | From | Stefan Richter <> | Subject | Re: [rfc PATCH] ieee1394: ohci1394: delete bogus spinlock, flush MMIO writes |
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Alan wrote: > On Tue, 28 Nov 2006 22:24:11 +0100 (CET) > Stefan Richter <stefanr@s5r6.in-berlin.de> wrote: >> All MMIO writes which were surrounded by the spinlock as well as the >> very last MMIO write of the IRQ handler are now explicitly flushed by >> MMIO reads of the respective register. > > MMIO is ordered anyway on the bus, you just need mmiowb() to force > ordering to the bus controller in case you are on a big numa box.
The mmiowb is a checkpoint to ensure ordering between different threads of MMIO writes; i.e. it doesn't halt the thread until the write actually reached the device like a read would do, right? -- Stefan Richter -=====-=-==- =-== ===-= http://arcgraph.de/sr/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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