"ODonnell, Michael" <[email protected]> wrote:
>
> We have identified two related bugs in the e100 driver and we request
> that they be repaired in the official Intel version of the driver.
>
> Both bugs are related to manipulation of the MDI control register.
>
> The first problem is that the Ready bit is being ignored when
> writing to the Control register; we noticed this because the Linux
> bonding driver would occasionally come to the spurious conclusion
> that the link was down when querying Link State. It turned out
> that by failing to wait for a previous command to complete it was
> selecting what was essentially a random register in the MDI register
> set. When we added code that waits for the Ready bit (as shown in
> the patch file below) all such problems ceased.
>
> The second problem is that, although access to the MDI registers
> involves multiple steps which must not be intermixed, nothing was
> defending against two or more threads attempting simultaneous access.
> The most obvious situation where such interference could occur
> involves the watchdog versus ioctl paths, but there are probably
> others, so we recommend the locking shown in our patch file.
Your patches are coming through wordwrapped. Please fix your email client
in future.
Please also prepare patches in `patch -p1' form.
http://www.zip.com.au/~akpm/linux/patches/stuff/tpp.txt may prove useful.
This patch potentially spins for four milliseconds with interrupts off,
which will be unpopular. Is there no alternative?
Anyway, I queued the patch in my kernel so the issue won't be forgotten
about. I also queued a patch which makes your patch comply with kernel
coding style - it wasn't very close at all.
Thanks.
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