Re: [Xen-devel] GPLPV Drivers 0.9.11-pre4 hang during boot - WindowsXP Pro SP2

[Wayne Gong <wayne.gong@xxxxxxxxxx>]

> That patch appears to be to your wdf version of the code... can you give
> me a summary of what the change you made is?
>
> At a guess, the difference to the original code is that you are doing
> two separate notify's, and a KeMemoryBarrier after each. Can you tell my
> why the barrier is required?
>
> I just noticed that the for() loop will never actually do anything as
> req->nr_segments is initialised to zero... that's the same in my current
> code too! I wonder how long that has been a problem for? I'll change my
> code to initialise nr_segments to the maximum.
>
> James
>
>   
Yes, as you mentioned, there are only two difference. When I meet the 
bug, I have no idea to deal with it. So I try several method and times 
to fix it. After I changed the code up to the patch as I send to you, it 
works fine. And till now I am not very such whether this bug has been 
fixed. So I this patch just a try and I cannot explain it exactly even 
today.
Best regards -- Wayne


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