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From: "Huang\, Ying" <ying.huang@intel.com>
To: Michael Welling <mwelling@ieee.org>
Cc: Arnd Bergmann <arnd@arndb.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Linus Walleij <linus.walleij@linaro.org>,
        LKML <linux-kernel@vger.kernel.org>, Johan Hovold <johan@kernel.org>,
        "Markus Pargmann" <mpa@pengutronix.de>, <lkp@01.org>
Subject: Re: [LKP] [lkp] [gpio] 3c702e9987: kmsg.user_verbs:couldn't_register_device_number
References: <87ziv3n5fp.fsf@yhuang-dev.intel.com>
	<20160214080643.GA31304@qwerty.qwertyembedded>
Date: Mon, 15 Feb 2016 10:39:11 +0800
In-Reply-To: <20160214080643.GA31304@qwerty.qwertyembedded> (Michael Welling's
	message of "Sun, 14 Feb 2016 02:06:43 -0600")
Message-ID: <8760xqd7e8.fsf@yhuang-dev.intel.com>
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Michael Welling <mwelling@ieee.org> writes:

> On Sun, Feb 14, 2016 at 02:59:06PM +0800, kernel test robot wrote:
>> FYI, we noticed the below changes on
>> 
>> https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git chardev
>> commit 3c702e9987e261042a07e43460a8148be254412e ("gpio: add a userspace chardev ABI for GPIOs")
>> 
>> 
>> [    1.951191] user_verbs: couldn't register device number
>
> Looks like user_verbs is using a static device node setup.
>
> enum {
>         IB_UVERBS_MAJOR       = 231,
>         IB_UVERBS_BASE_MINOR  = 192,
>         IB_UVERBS_MAX_DEVICES = 32
> };
>
> #define IB_UVERBS_BASE_DEV      MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
>
> Something tells me that a new GPIO chardev is taking this spot.
>
> It looks like the device is documented to be using the range:
> https://www.kernel.org/doc/Documentation/devices.txt
>
> Could you run cat /proc/devices?
>

Sorry, the test mechanism is not flexible enough to run some shell
command in test system.  Could you provide a specialized debug kernel to
dump the necessary information in kernel log?  We can collect dmesg
easily.

Best Regards,
Huang, Ying