netdev - Re: [v12, 7/8] base: soc: introduce soc_device

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Date:   Wed, 21 Sep 2016 10:56:14 +0300
From:   Alexander Shiyan <shc_work@...l.ru>
To:     Yangbo Lu <yangbo.lu@....com>
Cc:     Mark Rutland <mark.rutland@....com>,
        Xiaobo Xie <xiaobo.xie@....com>,
        Minghuan Lian <minghuan.lian@....com>,
        linux-i2c@...r.kernel.org, linux-clk@...r.kernel.org,
        Qiang Zhao <qiang.zhao@....com>,
        Russell King <linux@....linux.org.uk>,
        Bhupesh Sharma <bhupesh.sharma@...escale.com>,
        Joerg Roedel <joro@...tes.org>,
        Jochen Friedrich <jochen@...am.de>,
        Claudiu Manoil <claudiu.manoil@...escale.com>,
        devicetree@...r.kernel.org,
        Kumar Gala <galak@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Leo Li <leoyang.li@....com>,
        iommu@...ts.linux-foundation.org, linuxppc-dev@...ts.ozlabs.org,
        linux-mmc@...r.kernel.org, ulf.hansson@...aro.org,
        Scott Wood <oss@...error.net>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [v12, 7/8] base: soc: introduce soc_device_match() interface

>Среда, 21 сентября 2016, 9:57 +03:00 от Yangbo Lu <yangbo.lu@....com>:
>
>From: Arnd Bergmann < arnd@...db.de >
>
>We keep running into cases where device drivers want to know the exact
>version of the a SoC they are currently running on. In the past, this has
>usually been done through a vendor specific API that can be called by a
>driver, or by directly accessing some kind of version register that is
>not part of the device itself but that belongs to a global register area
>of the chip.
...
>+const struct soc_device_attribute *soc_device_match(
>+const struct soc_device_attribute *matches)
>+{
>+int ret = 0;
>+
>+if (!matches)
>+return NULL;
>+
>+while (!ret) {
>+if (!(matches->machine || matches->family ||
>+      matches->revision || matches->soc_id))
>+break;
>+ret = bus_for_each_dev(&soc_bus_type, NULL, (void *)matches,
>+       soc_device_match_one);
>+if (!ret)
>+matches++;

So, what happen if next "matches" (after increment) will be NULL?

I think you should use while(matches) at the start of this procedure.

---