netdev - Re: [PATCH] net: eth: altera: fix napi poll

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Message-Id: <20150902.112500.2176991714061589322.davem@davemloft.net>
Date:	Wed, 02 Sep 2015 11:25:00 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	nemoto@...hiba-tops.co.jp
Cc:	vbridger@...nsource.altera.com, netdev@...r.kernel.org
Subject: Re: [PATCH] net: eth: altera: fix napi poll_list corruption

From: Atsushi Nemoto <nemoto@...hiba-tops.co.jp>
Date: Wed, 2 Sep 2015 17:49:29 +0900

> tse_poll() calls __napi_complete() with irq enabled.  This leads napi
> poll_list corruption and may stop all napi drivers working.
> Use napi_complete() instead of __napi_complete().
> 
> Signed-off-by: Atsushi Nemoto <nemoto@...hiba-tops.co.jp>

Two lines below this change you are disabling interrupts anyways,
so I would suggest just moving the spin_lock_irqsave() before the
napi_gro_flush() to fix this.

Many of the checks done by napi_complete_done() (invoked by
napi_complete()) are completely redundant in this context.  For
example, the direct __napi_complete() call is a really nice
optimization because we know we are on the poll list and therefore
it is not empty.
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