Hello!
> The following piece of code is from the unregister_netdevice() function.
> I would like to know why no read_lock is acquired when looping thru the
> list.
Because there is another lock, which is acquired by caller and
prohibits modification of the list by anyone but this process.
> or why the write_lock isn't acquired before the start of the loop.
Because it will stop all the network, when you have enough of devices.
It is not necessary while semaphore is used.
> Also i'd greatly appreciate if someone can explain the differences between
> write_lock() and write_lock_bh().
It prevents reentry from BHs, which could try to get read_lock
and dead lock.
Alexey Kuznetsov
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