netdev - Re: [ofa-general] [PATCH 09/13] QLogic VNIC: IB Multicast for Ethernet broadcast/multicast

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Message-ID: <ada7idvdwhj.fsf@cisco.com>
Date:	Thu, 15 May 2008 15:38:00 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	Ramachandra K <ramachandra.kuchimanchi@...gic.com>
Cc:	general@...ts.openfabrics.org, netdev@...r.kernel.org,
	poornima.kamath@...gic.com, amar.mudrankit@...gic.com
Subject: Re: [ofa-general] [PATCH 09/13] QLogic VNIC: IB Multicast for Ethernet broadcast/multicast

 > +#define SET_MCAST_STATE_INVALID \
 > +do { \
 > +	viport->mc_info.state = MCAST_STATE_INVALID; \
 > +	viport->mc_info.mc = NULL; \
 > +	memset(&viport->mc_info.mgid, 0, sizeof(union ib_gid)); \
 > +} while (0);

Seems like this could be profitably implemented in C instead of CPP.

 > +		spin_lock_irqsave(&viport->mc_info.lock, flags);
 > +		viport->mc_info.state = MCAST_STATE_INVALID;
 > +		spin_unlock_irqrestore(&viport->mc_info.lock, flags);

This pattern makes me uneasy about the locking... setting the state
member will already be atomic, so what do you think you're protecting
against here by taking the lock?

 - R.
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