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Alan wrote: > Would be nice if it used atl_ not at_ so its less likely to cause > namespace clashes. Some of this code looked like Attansic may have meant to share it between drivers for atl1/atl2/atf1/atf2, but seeing as I can't find any code for those, I'll convert it all to atl1_ and let Attansic generalize the code if they ever decide they want to submit drivers. > You have various macros for swaps that are pretty ugly - we have > cpu_to and le/be_to_cpu functions for most swapping cases and these are > generally optimised assembler (eg bswap on x86) > > AT_DESC_USED/UNUSED would be better as inline functions but thats not a > serious concern. > > Be careful with :1 bitfields when working with hardware - the compiler > has more than one choice about how to pack them. Lacking a spec, I'm not entirely sure what the original intent was, so we're stuck with testing. Is there a specific disambiguation technique you recommend? > The irq enable/disable use for locking on vlan appears unsafe. PCI > interrupt delivery is asynchronous which means you can get this happen > > > card sends PCI interrupt > We call irq_disable > We take lock > We poke bits > We drop lock > > PCI interrupt arrives > > > This really does happen, typically its nasty to debug as well because you > usually only get it on PIII boards on the one in n-zillion times a > message collides and is retransmitted on the APIC bus. Nice catch. I admit the VLAN code is not so well audited or tested. Fortunately, the chip only seems to be on Asus M2V motherboards, at least for now, but I want to audit all of the locking code at some point. > skb->len is unsigned so <= 0 can be == 0. More importantly the subtraction > before the test will wrap and is completely unsafe (see at_xmit_frame) Thanks! -- Chris - 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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