Is it possible for one thread to set sc->rxlink but another thread reads a stale value from cache?
I'm sorry, but I don't really hack kernel code, so I'm not familiar with the memory model the code assumes. bob ==================== On Sun, Jun 6, 2010 at 8:16 PM, Robert Brown <robert.br...@gmail.com> wrote: > Sure, but I only see one place in ath5k_rxbuf_setup where it returns > an error value (-ENOMEM). I'm using a 5/18/2010 snapshot. Should I > grab a later version? > > Are there any cache issues when dealing with hardware devices like > the Atheros chip? For instance, ath5k_rxbuf_setup sets up descriptors > and links. Is it certain the hardware has the same view of memory? > > bob > > =================== > > On Sun, Jun 6, 2010 at 8:19 AM, Bob Copeland <m...@bobcopeland.com> wrote: > >> On Sat, Jun 5, 2010 at 3:16 PM, Robert Brown <robert.br...@gmail.com> >> wrote: >> > I transferred 1 Gb of data twice while executing the scan command as >> above. >> > I got 3 corrupted blocks on the first transfer and 2 on the second, >> which is >> > more than I normally expect. Usually, I have to transfer 2 or 3 Gb >> before I >> > see one bad block. Not conclusive, but it supports your hunch. >> > The length of each bad run was 1445 bytes. >> >> What about this -- can you annotate ath5k_rxbuf_setup in the two >> places it returns error codes to see if those are ever hit? >> >> I wonder if the issue is similar to what Benoit said: we somehow >> get a "done" descriptor at the head of the buffer list. We always >> move the done item to the end before we try resetting the descriptor >> which seems a bit backwards. >> >> -- >> Bob Copeland %% www.bobcopeland.com >> > >
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