netdev - Re: [PATCH 1/5] ucc_geth: Reduce IRQ off in xmit path

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Message-ID: <20120919223416.GA16087@electric-eye.fr.zoreil.com>
Date:	Thu, 20 Sep 2012 00:34:16 +0200
From:	Francois Romieu <romieu@...zoreil.com>
To:	Joakim Tjernlund <Joakim.Tjernlund@...nsmode.se>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH 1/5] ucc_geth: Reduce IRQ off in xmit path

Joakim Tjernlund <Joakim.Tjernlund@...nsmode.se> :
> Currently ucc_geth_start_xmit wraps IRQ off for the
> whole body just to be safe.
> Reduce the IRQ off period to a minimum.

It opens a window in ucc_geth_start_xmit where the skb slot in
ugeth->tx_skbuff[txQ] is set and T_RA has not been written into
the descriptor status. Consider a racing poll : the !skb test in
ucc_geth_tx may not work as expected.

-- 
Ueimor
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