linux-kernel - Re: [LKP] [lkp] [gpio] 3c702e9987: kmsg.user_verbs:couldn't_register_device

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Date:	Tue, 23 Feb 2016 14:35:14 +0800
From:	"Huang\, Ying" <ying.huang@...el.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	"Huang\, Ying" <ying.huang@...el.com>,
	Michael Welling <mwelling@...e.org>,
	Arnd Bergmann <arnd@...db.de>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Johan Hovold <johan@...nel.org>,
	"Markus Pargmann" <mpa@...gutronix.de>, <lkp@...org>
Subject: Re: [LKP] [lkp] [gpio] 3c702e9987: kmsg.user_verbs:couldn't_register_device_number

Linus Walleij <linus.walleij@...aro.org> writes:

> On Mon, Feb 15, 2016 at 3:39 AM, Huang, Ying <ying.huang@...el.com> wrote:
>> Michael Welling <mwelling@...e.org> writes:
>
>>> 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.
>
> Can you try this:
>
> diff --git a/fs/char_dev.c b/fs/char_dev.c
> index 24b142569ca9..74a2d433273e 100644
> --- a/fs/char_dev.c
> +++ b/fs/char_dev.c
> @@ -96,6 +96,8 @@ __register_chrdev_region(unsigned int major,
> unsigned int baseminor,
>              goto out;
>          }
>          major = i;
> +        pr_info("CHARDEV: allocate major %d for \"%s\"\n",
> +            i, name);
>      }
>
>      cd->major = major;
>
> Then dmesg |grep CHARDEV should tell what we need to know.

Sorry for late, the dmesg with the patch is attached.  And the output of
dmesg | grep CHARDEV is as follow:

[    0.750037] CHARDEV: allocate major 254 for "gpiochip"
[    0.897928] CHARDEV: allocate major 253 for "tpm"
[    0.904196] CHARDEV: allocate major 252 for "ndctl"
[    0.905295] CHARDEV: allocate major 251 for "dimmctl"
[    0.909573] CHARDEV: allocate major 250 for "pps"
[    0.913740] CHARDEV: allocate major 249 for "ptp"
[    0.916711] CHARDEV: allocate major 248 for "iio"
[    1.227597] CHARDEV: allocate major 247 for "bsg"
[    1.577194] CHARDEV: allocate major 246 for "gsmtty"
[    1.614921] CHARDEV: allocate major 245 for "ttyn"
[    1.616044] CHARDEV: allocate major 244 for "ttyARC"
[    1.617177] CHARDEV: allocate major 243 for "ttyRP"
[    1.618310] CHARDEV: allocate major 242 for "ttyLP"
[    1.620618] CHARDEV: allocate major 241 for "noz"
[    1.621707] CHARDEV: allocate major 240 for "ttyIPWp"
[    1.630024] CHARDEV: allocate major 239 for "telco_clock"
[    1.632315] CHARDEV: allocate major 239 for "cmm"
[    1.681375] CHARDEV: allocate major 238 for "hpilo"
[    1.696757] CHARDEV: allocate major 237 for "aac"
[    1.699338] CHARDEV: allocate major 236 for "megadev_legacy"
[    1.704680] CHARDEV: allocate major 235 for "megaraid_sas_ioctl"
[    1.731179] CHARDEV: allocate major 234 for "pmcsas"
[    1.737520] CHARDEV: allocate major 233 for "nvme"
[    2.388531] CHARDEV: allocate major 232 for "firewire"
[    2.389743] CHARDEV: allocate major 231 for "uio"
[    2.904429] CHARDEV: allocate major 230 for "ttySDIO"
[    2.922374] CHARDEV: allocate major 229 for "ib_qib"
[    2.927559] CHARDEV: allocate major 228 for "hidraw"
[    2.952328] CHARDEV: allocate major 227 for "fwtty"
[    2.953435] CHARDEV: allocate major 225 for "fwloop"

Best Regards,
Huang, Ying

Download attachment "dmesg.xz" of type "application/x-xz" (18264 bytes)