linux-kernel - Re: [PATCH v7 3/7] drivers/i2c: Add port structure to FSI algorithm

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Date:   Thu, 31 May 2018 09:18:09 -0500
From:   Eddie James <eajames@...ux.vnet.ibm.com>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     linux-i2c <linux-i2c@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Wolfram Sang <wsa@...-dreams.de>,
        Rob Herring <robh+dt@...nel.org>,
        Joel Stanley <joel@....id.au>,
        Mark Rutland <mark.rutland@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Edward A. James" <eajames@...ibm.com>
Subject: Re: [PATCH v7 3/7] drivers/i2c: Add port structure to FSI algorithm



On 05/30/2018 04:16 PM, Benjamin Herrenschmidt wrote:
> On Wed, 2018-05-30 at 10:47 -0500, Eddie James wrote:
>>>> +       if (!list_empty(&i2c->ports)) {
>>> My gosh, this is done already in list_for_each*()
>> No, list_for_each_entry does NOT check if the list is empty or if the
>> first entry is NULL.
> NULL is never valid for a list. It does however check for an empty list
>
> It does it implicitely in the test part of the for () statement,
> checking if the next pointer points back to the head.

Thanks Ben. My mistake on this one; I misread the macro. I will remove 
the check in v9... going to wait a little for any further comments now.

Thanks,
Eddie

>
> Cheers,
> Ben.
>
>