netdev - Re: [PATCH net] bnx2x: Fix statistics locking scheme

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Date:	Fri, 13 Mar 2015 15:51:47 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	Yuval.Mintz@...gic.com
Cc:	netdev@...r.kernel.org, Ariel.Elior@...gic.com
Subject: Re: [PATCH net] bnx2x: Fix statistics locking scheme

From: Yuval Mintz <Yuval.Mintz@...gic.com>
Date: Fri, 13 Mar 2015 19:02:36 +0000

>> This is terrible.
> 
>> Either you use locking to protect critical sections, or you don't.
> 
>> I do not want to see any code that enters the critical
>> section when the locked state cannot be acquired.
> 
> I've no real objection to re-spinning this, 
> given that it's an error flow we've never actually encountered.
> 
> Do notice that this doesn't change existing behavior of code.

I disagree.

The existing code took the spinlock unconditionally, and only
executed the critical section under the lock.

This exact place is where you are adding the semaphore timeout
stuff I am specifically objecting too.
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