linux-kernel - Aw: Re: [Intel-wired-lan] [PATCH] ixgbe: initialize u64_stats_sync structures early at ixgbe

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Message-ID: <trinity-a348af9b-9ef5-47a9-a14e-94265c880cf1-1493134775614@3capp-gmx-bs78>
Date:   Tue, 25 Apr 2017 17:39:35 +0200
From:   "Lino Sanfilippo" <LinoSanfilippo@....de>
To:     "Alexander Duyck" <alexander.duyck@...il.com>
Cc:     "Singh, Krishneil K" <krishneil.k.singh@...el.com>,
        "Song, Liwei (Wind River)" <liwei.song@...driver.com>,
        "Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Aw: Re: [Intel-wired-lan] [PATCH] ixgbe: initialize u64_stats_sync
 structures early at ixgbe_probe

Hi,

> This patch doesn't look right to me. I would suggest rejecting it.
> 
> The call to initialize the stats should be done when the ring is
> allocated, not in ixgbe_probe(). This should probably be done in
> ixgbe_alloc_q_vector() instead.
> 

AFAICS ixgbe_alloc_q_vector() is also called in probe() (by ixgbe_init_interrupt_scheme()).
Furthermore it is also called in resume() which would lead to multiple initialization of
the u64_stats_sync in case of resume.

IMHO the u64_stats_sync variables have to be initialized before register_netdev() is called
since this is the point from which userspace can call ixgbe_get_stats64(). I would say the
best place to do so is the probe() function as it is done in this patch.

Just my 2 cents.

Regards,
Lino