From: joanpau.beltran@uib.cat (Joan Pau Beltran)
To: kernelnewbies@lists.kernelnewbies.org
Subject: GPIO driver module for Jetway NF98 board
Date: Mon, 23 Jan 2012 22:00:44 +0100 [thread overview]
Message-ID: <4F1DCA7C.2060904@uib.cat> (raw)
In-Reply-To: <4F173C52.5010805@uib.cat>
Now that the code compiles, I need some help to debug it.
I used the kernel headers shipped with my distribution (Ubuntu), namely
(from uname -r)
2.6.38-13-generic
Everything compiles fine, without any warning.
But calling insmod, immediately triggers this error (from dmesg):
[ 798.129707] generic-usb 0003:413C:2101.0002: input,hidraw0: USB HID
v1.11 Keyboard [Dell Dell Smart Card Reader Keyboard] on
usb-0000:00:1a.0-1.2/input0
[ 1414.832761] BUG: unable to handle kernel NULL pointer dereference at
0000000000000502
[ 1414.832880] IP: [<ffffffffa00300e4>] jwnf98_gpio_init+0xe4/0x1000
[gpio_jwnf98]
[ 1414.832982] PGD 20a704067 PUD 21a601067 PMD 0
[ 1414.833036] Oops: 0000 [#1] SMP
[ 1414.833077] last sysfs file:
/sys/devices/pci0000:00/0000:00:19.0/net/eth0/statistics/collisions
[ 1414.833152] CPU 3
[ 1414.833172] Modules linked in: gpio_jwnf98(+) btrfs zlib_deflate
libcrc32c ufs qnx4 hfsplus hfs minix ntfs vfat msdos fat jfs xfs
exportfs reiserfs ppdev snd_hda_codec_hdmi snd_hda_codec_via
snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi
snd_seq_midi_event lm78 hwmon_vid snd_seq snd_timer snd_seq_device i915
drm_kms_helper psmouse drm i2c_algo_bit snd video soundcore
snd_page_alloc serio_raw lp parport intel_ips usbhid hid firewire_ohci
e1000e firewire_core crc_itu_t
[ 1414.833725]
[ 1414.833744] Pid: 28764, comm: insmod Not tainted 2.6.38-13-generic
#54~lucid1-Ubuntu To be filled by O.E.M. To be filled by O.E.M./To be
filled by O.E.M.
[ 1414.833877] RIP: 0010:[<ffffffffa00300e4>] [<ffffffffa00300e4>]
jwnf98_gpio_init+0xe4/0x1000 [gpio_jwnf98]
[ 1414.833965] RSP: 0018:ffff880208adbf18 EFLAGS: 00010206
[ 1414.834011] RAX: ffff8801e8e8f900 RBX: ffffffffa04cf080 RCX:
ffff8801e8e8f328
[ 1414.834071] RDX: 0000000000000538 RSI: 0000000000000538 RDI:
ffffffff81a19438
[ 1414.834131] RBP: ffff880208adbf18 R08: 0000000000000000 R09:
ffff8801e8e8f900
[ 1414.834191] R10: 0000000000000004 R11: 0000000000000001 R12:
0000000000000000
[ 1414.834251] R13: ffffffffa0030000 R14: 0000000000000003 R15:
0000000000004000
[ 1414.834312] FS: 00007fbb2f5a5700(0000) GS:ffff8800cb380000(0000)
knlGS:0000000000000000
[ 1414.834380] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1414.834430] CR2: 0000000000000502 CR3: 00000002089b2000 CR4:
00000000000006e0
[ 1414.834490] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[ 1414.834549] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
0000000000000400
[ 1414.834610] Process insmod (pid: 28764, threadinfo ffff880208ada000,
task ffff88021bad16e0)
[ 1414.834678] Stack:
[ 1414.834698] ffff880208adbf48 ffffffff81002053 ffffffffa04cf080
0000000000000000
[ 1414.834775] 00000000024a7010 0000000000000003 ffff880208adbf78
ffffffff810a3d4b
[ 1414.834851] 00007fff75d0d9da 00007fff75d0d9da 00000000024a7030
00000000000019db
[ 1414.834927] Call Trace:
[ 1414.834958] [<ffffffff81002053>] do_one_initcall+0x43/0x190
[ 1414.835011] [<ffffffff810a3d4b>] sys_init_module+0xfb/0x250
[ 1414.835062] [<ffffffff8100c082>] system_call_fastpath+0x16/0x1b
[ 1414.835114] Code: c7 c7 c0 93 a1 81 e8 5c d8 03 e1 45 31 c0 48 c7 c1
24 e0 4c a0 ba 01 00 00 00 be 38 05 00 00 48 c7 c7 c0 93 a1 81 e8 3c d8
03 e1 <8a> 04 25 02 05 00 00 48 c7 c7 00 f0 4c a0 83 c8 20 88 04 25 02
[ 1414.842138] RIP [<ffffffffa00300e4>] jwnf98_gpio_init+0xe4/0x1000
[gpio_jwnf98]
[ 1414.845597] RSP <ffff880208adbf18>
[ 1414.849064] CR2: 0000000000000502
[ 1414.921662] ---[ end trace d6d694e0e28fc4ad ]---
I am not aware of any pointer dereference in the code, so it is dificult
to me
to figure out what is wrong.
Fortunately, the system does not become unresponsive (what a nice
kernel!!!).
The gpio_jwnf98 is listed in lsmod,
but no chip directory appears under /sys/class/gpio.
Finally, the module can not be removed, rmmod outputs:
ERROR: Module gpio_jwnf98 is in use
Thanks again for all the help.
--
Joan Pau Beltran
prev parent reply other threads:[~2012-01-23 21:00 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-21 17:34 GPIO driver module for Jetway NF98 board Joan Pau Beltran
2011-12-22 1:21 ` Josh Cartwright
[not found] ` <20111222001549.GA14353@joshcartwright.net>
2011-12-28 17:03 ` Joan Pau Beltran
2011-12-29 17:53 ` Josh Cartwright
2012-01-18 20:48 ` Joan Pau Beltran
2012-01-18 21:40 ` Joan Pau Beltran
2012-01-23 21:00 ` Joan Pau Beltran [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4F1DCA7C.2060904@uib.cat \
--to=joanpau.beltran@uib.cat \
--cc=kernelnewbies@lists.kernelnewbies.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.