On Thu, 8 Aug 2013, Jussi Kivilinna wrote: > On 08.08.2013 18:14, Petko Manolov wrote: > > On Wed, 7 Aug 2013, Jussi Kivilinna wrote: > > > >> rtl8150 allocates URB transfer_buffer and setup_packet as part of same > >> structure 'struct async_req'. This can cause same cacheline to be > >> DMA-mapped twice with same URB. This can lead to memory corruption on > >> some systems. > > > > I can see performance impact due to the double mapping. However, memory > > corruption seems a bit too much for sane cache and DMA controllers. Out > > of interest - which is the architecture that will potentially corrupt the > > memory. > > rtlwifi driver had similar structure to allocate both setup_packet and > transfer_buffer in single go (overlapping dma-mapping cachelines) and > this caused problems on ARM/sunxi. Problems means: memory corruptions at > random locations, device freezes and lock-ups.
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