linux-kernel - Re: [PATCH] usb: gadget: nokia: Add mass storage driver to g

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Message-ID: <54D6530D.7070100@gmail.com>
Date:	Sat, 07 Feb 2015 20:01:49 +0200
From:	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>
To:	balbi@...com,
	Pali Rohár <pali.rohar@...il.com>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Pavel Machek <pavel@....cz>,
	Sebastian Reichel <sre@...nel.org>,
	Aaro Koskinen <aaro.koskinen@....fi>
Subject: Re: [PATCH] usb: gadget: nokia: Add mass storage driver to g_nokia



On  2.02.2015 21:14, Felipe Balbi wrote:
> On Mon, Feb 02, 2015 at 08:07:51PM +0100, Pali Rohár wrote:
>> On Monday 02 February 2015 20:01:11 Felipe Balbi wrote:
>>> Hi,
>>>
>>> On Mon, Feb 02, 2015 at 07:58:59PM +0100, Pali Rohár wrote:
>>>> On Monday 02 February 2015 19:54:58 Felipe Balbi wrote:
>>>>> Hi,
>>>>>
>>>>> On Sat, Jan 31, 2015 at 10:53:30AM +0100, Pali Rohár wrote:
>>>>>> This patch adds removable mass storage support to
>>>>>> g_nokia gadget (for N900). It means that at runtime
>>>>>> block device can be exported or unexported. So it does
>>>>>> not export anything by default and thus allows to use
>>>>>> MyDocs partition as before...
>>>>>>
>>>>>> Signed-off-by: Pali Rohár <pali.rohar@...il.com>
>>>>>
>>>>> thanks, but no thanks. Build your own using configfs.
>>>>
>>>> But it needs some userspace interaction right?
>>>> Then its not possible for nfsboot.
>>>
>>> oh, right... you're using nfsboot through g_nokia. Hmm, sounds
>>> like you need initramfs.
>>
>> Also compiling usb gadgets as external .ko modules is broken.
>> So I cannot use configfs, when I compile g_nokia even if I use
>> initramfs...
>
> yeah, there are people working on that and some patches already flying
> around for it. Meanwhile, you can make it built-in and use initramfs to
> add mass_storage through configfs to g_nokia, no issues.
>

Bellow is the bactrace of the crash when g_nokia is modprobed. Any hint 
on where to look for is appreciated.

<0>[   33.751983] Kernel panic - not syncing: Fatal exception
ÿÿT!19\00]\00]<6>[   59.570159] bq2415x-charger 2-006b: automode enabled
<1>[   59.597534] [bf286014] *pgd=8eda8811, *pte=00000000, *ppte=00000000
<6>[   59.609405] bq2415x-charger 2-006b: driver registered
<0>[   59.640472] Internal error: Oops: 80000007 [#1] PREEMPT ARM
<4>[   59.650421] Modules linked in: ipv6(+) bq2415x_charger(+) 
g_mass_storage usb_f_mass_storage libcomposite configfs uinput adp1653 
ad5820 et8ek8 smiaregs hsi_char radio_platform_si4713 joydev 
omap_ssi_port wl1251_spi wl1251 rx51_battery mac80211 isp1704_charger 
smc91x mii cfg80211 si4713 v4l2_common crc7 videodev tsc2005 media 
tsl2563 twl4030_vibra ff_memless lis3lv02d_i2c lis3lv02d omap_ssi 
input_polldev hsi twl4030_wdt omap_wdt rtc_twl leds_lp5523 
leds_lp55xx_common
<4>[   59.715332] CPU: 0 PID: 13 Comm: kworker/0:1 Not tainted 
3.19.0-rc5+ #2
<4>[   59.726501] Hardware name: Nokia RX-51 board
<4>[   59.735168] Workqueue: events usb_gadget_work
<4>[   59.743896] task: cf8ab900 ti: cf992000 task.ti: cf992000
<4>[   59.753692] PC is at 0xbf286014
<4>[   59.761108] LR is at try_get_usb_function_instance+0x90/0x9c 
[libcomposite]
<4>[   59.772613] pc : [<bf286014>]    lr : [<bf2640c8>]    psr: 80000113
<4>[   59.772613] sp : cf993e50  ip : 0000001c  fp : 00000000
<4>[   59.793060] r10: 00000000  r9 : 00000000  r8 : cfcad600
<4>[   59.802581] r7 : cedaab80  r6 : 00000000  r5 : bf28444c  r4 : cedaab80
<4>[   59.813476] r3 : cedd8f38  r2 : 00000001  r1 : 00000000  r0 : cedd8f04
<4>[   59.824310] Flags: Nzcv  IRQs on  FIQs on  Mode SVC_32  ISA ARM 
Segment kernel
<4>[   59.836090] Control: 10c5387d  Table: 8e970019  DAC: 00000015
<0>[   59.846252] Process kworker/0:1 (pid: 13, stack limit = 0xcf992238)
<0>[   59.857086] Stack: (0xcf993e50 to 0xcf994000)
<0>[   59.865814] 3e40:                                     c03fb2d8 
bf266e68 cf1fdf00 c015d0dc
<0>[   59.878723] 3e60: 92000000 00001000 00000000 c015d8d8 00001000 
00000000 c03fb2d8 bf266e68
<0>[   59.891693] 3e80: 00000000 00000001 00000000 c00f58f8 cf801c80 
cedaab80 cf03b0b8 cedaac00
<0>[   59.904663] 3ea0: bf284424 c015d980 00000000 bf266e68 00000000 
cedaab80 bf28444c 00000000
<0>[   59.917572] 3ec0: cf03b0b8 cfcad600 00000000 bf263dd8 cf03b0b8 
bf28444c cf03b0b8 cf1fea00
<0>[   59.930450] 3ee0: c0620cd8 bf28444c c0609868 cfcad600 00000000 
00000000 00000000 c02c5478
<0>[   59.943420] 3f00: bf284470 c0620cd8 c0606ff8 c02c5f54 cf98d080 
bf284470 c0606ff8 c0047288
<0>[   59.956390] 3f20: cf98d080 bf284470 00000001 cf98d080 c0606ff8 
c0607008 c0609868 cf98d098
<0>[   59.969360] 3f40: 00000008 00000000 00000000 c00477ec cf98a580 
00000000 cf98d080 c00474c4
<0>[   59.982330] 3f60: 00000000 00000000 00000000 c004b148 22000000 
00000000 11880000 cf98d080
<0>[   59.995208] 3f80: 00000000 cf993f84 cf993f84 00000000 cf993f90 
cf993f90 cf993fac cf98a580
<0>[   60.008026] 3fa0: c004b07c 00000000 00000000 c000e058 00000000 
00000000 00000000 00000000
<0>[   60.020782] 3fc0: 00000000 00000000 00000000 00000000 00000000 
00000000 00000000 00000000
<0>[   60.033355] 3fe0: 00000000 00000000 00000000 00000000 00000013 
00000000 40000500 04000401
<4>[   60.045867] [<bf2640c8>] (try_get_usb_function_instance 
[libcomposite]) from [<c015d0dc>] (__kernfs_create_file+0x7c/0xa0)
<4>[   60.065155] [<c015d0dc>] (__kernfs_create_file) from [<c015d8d8>] 
(sysfs_add_file_mode_ns+0x134/0x1ac)
<4>[   60.082977] [<c015d8d8>] (sysfs_add_file_mode_ns) from 
[<c015d980>] (sysfs_create_file_ns+0x30/0x44)
<4>[   60.100952] [<c015d980>] (sysfs_create_file_ns) from [<cedaab80>] 
(0xcedaab80)
<0>[   60.112884] Code: bad PC value
<6>[   60.210144] NET: Registered protocol family 10
<6>[   60.671600] bq27x00-battery 2-0055: support ver. 1.2.0 enabled
<6>[   60.832885] bq27x00-battery 2-0055: battery is not calibrated! 
ignoring capacity values
<6>[   63.788269] Adding 786428k swap on /dev/mmcblk0p3.  Priority:-1 
extents:1 across:786428k SS
<5>[   64.057617] random: nonblocking pool is initialized
<6>[   64.554016] NET: Registered protocol family 35
<4>[   65.667510] ---[ end trace 85b8d26ec312a8c1 ]---


Regards,
Ivo
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