> zero and we are running in such slow path, it is obvious the send_head
> _was_ NULL when we entered the critical section, so it's perfectly fine
It is not only not obvious, it is not true almost always.
On normally working tcp send_head is almost never NULL,
it is NULL only when application is so slow that is not able
to saturate pipe. If you do not believe my word, add printk checking this. 8)
Alexey
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