netdev - Re: [PATCH 1/3] qla3xxx: ethernet: Fix bogus interrupt state flag.

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Message-Id: <20120302.161332.2236794166581618113.davem@davemloft.net>
Date:	Fri, 02 Mar 2012 16:13:32 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	santoshprasadnayak@...il.com
Cc:	bhutchings@...arflare.com, jitendra.kalsaria@...gic.com,
	ron.mercer@...gic.com, linux-driver@...gic.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 1/3] qla3xxx: ethernet: Fix bogus interrupt state flag.

From: santosh prasad nayak <santoshprasadnayak@...il.com>
Date: Fri, 2 Mar 2012 21:24:29 +0530

> In "ql_adapter_initialize", first unlock is done by
> "spin_unlock_irqrestore(&qdev->hw_lock, hw_flags)"
> with "hw_flags = 0"   ("hw_flags" is local variable and initialized to
> zero.),   which is as good as
> spin_unlock_irq.

You must never pass to irqrestore anything other than a hw_flags
value given by irqsave or similar.

You may not assume anything about what values hw_flags takes on nor
what those values might mean, they are architecture specific so
you may not just set it to zero and assume that does anything in
particular.
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