![]() The end of descriptor buffer pages, which should be harmless to do ![]() This works around the problem by always leaving 0x10 padding bytes at This is often harmless, butĬan cause page faults on modern systems with IOMMUs:ĭMAR: Request device fault addr fff56000 PTE Read access is not setįirewire_ohci 0000:05:00.0: DMA context IT0 has stopped, error code: evt_descriptor_read To: stable, linux-kernel +Cc: Hector Martin, Stefan Richter, Sasha LevinĪt least some JMicron controllers issue buggy oversized DMA reads whenįetching context descriptors, always fetching 0x20 bytes at once forĭescriptors which are only 0x10 bytes long. ` (156 more replies) 0 siblings, 157 replies 275+ messages in thread 0:19 ` x86/tsc: Allow TSC calibration without PIT Sasha Levin Firewire-ohci: work around oversized DMA reads on JMicron controllers archive mirror help / color / mirror / Atom feed * firewire-ohci: work around oversized DMA reads on JMicron controllers 0:19 Sasha Levin ![]()
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