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Date: Wed, 6 Feb 2013 10:04:24 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Felipe Balbi <balbi@...com>
Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [usb gadget] WARNING: at kernel/mutex.c:198 __mutex_lock_common()
Greetings,
I got the below warning and the first bad commit is
commit 19b10a8828a6cdd5a4e7e37babd5084d35641f87
Author: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Date: Sun Dec 23 21:10:06 2012 +0100
usb: gadget: allocate & giveback serial ports instead hard code them
This patch removes gserial_setup() and gserial_cleanup() and adds
gserial_alloc_line() and gserial_free_line() to replace them.
The initial setup of u_serial happens now on module load time. A
maximum of four TTY ports can be requested which is the current limit.
In theory we could extend this limit, the hard limit is the number of
available endpoints.
alloc_tty_driver() is now called at module init time with the max
available ports. The per-line footprint here is on 32bit is 3 * size of
pointer + 60 bytes (for cdevs).
The remaining memory (struct gs_port) is allocated once a port is
requested.
With this change it is possible to load g_multi and g_serial at the same
time. GS0 receives the module that is loaded first, GS1 is received by
the next module and so on. With the configfs interface the port number
can be exported and the device node is more predictable. Nothing changes
for g_serial and friends as long as one module is used.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: Felipe Balbi <balbi@...com>
[ 4.625655] usb0: HOST MAC da:6c:61:74:5d:c0
[ 4.626504] ------------[ cut here ]------------
[ 4.627366] WARNING: at /c/kernel-tests/src/linux/kernel/mutex.c:198 __mutex_lock_common+0xcf/0x357()
[ 4.627446] Pid: 1, comm: swapper Not tainted 3.8.0-rc5-00646-g2f520a0 #4
[ 4.627446] Call Trace:
[ 4.627446] [<c1028524>] warn_slowpath_common+0x54/0x69
[ 4.627446] [<c147be9a>] ? __mutex_lock_common+0xcf/0x357
[ 4.627446] [<c147be9a>] ? __mutex_lock_common+0xcf/0x357
[ 4.627446] [<c10285d7>] warn_slowpath_null+0x1d/0x22
[ 4.627446] [<c147be9a>] __mutex_lock_common+0xcf/0x357
[ 4.627446] [<c123b588>] ? gserial_alloc_line+0x21/0x18d
[ 4.627446] [<c10391c0>] ? schedule_delayed_work+0x11/0x13
[ 4.627446] [<c13b7c82>] ? linkwatch_schedule_work+0x62/0x65
[ 4.627446] [<c147c15b>] mutex_lock_nested+0x39/0x3f
[ 4.627446] [<c123b588>] ? gserial_alloc_line+0x21/0x18d
[ 4.627446] [<c123b588>] gserial_alloc_line+0x21/0x18d
[ 4.627446] [<c18ffb7c>] cdc_bind+0x2b/0xf2
[ 4.627446] [<c122d9ca>] ? composite_dev_prepare+0x8e/0xc0
[ 4.627446] [<c122db66>] composite_bind+0x82/0x16a
[ 4.627446] [<c18fface>] ? udc_driver_init+0xf/0xf
[ 4.627446] [<c18fface>] ? udc_driver_init+0xf/0xf
[ 4.627446] [<c122b6c4>] udc_bind_to_driver+0x47/0xb2
[ 4.627446] [<c18fface>] ? udc_driver_init+0xf/0xf
[ 4.627446] [<c122bc07>] usb_gadget_probe_driver+0x65/0x7e
[ 4.627446] [<c122dcbb>] usb_composite_probe+0x6d/0x78
[ 4.627446] [<c18ffadb>] init+0xd/0xf
[ 4.627446] [<c18dd9ba>] do_one_initcall+0x7e/0x12e
[ 4.627446] [<c18ddb3e>] kernel_init_freeable+0xd4/0x16e
[ 4.627446] [<c18dd435>] ? do_early_param+0x7a/0x7a
[ 4.627446] [<c14737fb>] kernel_init+0xb/0xbe
[ 4.627446] [<c147e8b7>] ret_from_kernel_thread+0x1b/0x28
[ 4.627446] [<c14737f0>] ? rest_init+0x11c/0x11c
[ 4.627446] ---[ end trace 8ef03ce626e1a2a9 ]---
git bisect start 2f520a0e87bbe47bf0909ce5700dd72b258991d2 cf5425bfcd6909f9831a00bc06ccb9a5b163766a --
git bisect good # 10 2013-02-05 16:54:14 Merge branch 'sdio_acpi' into for-zhangrui
git bisect good # 10 2013-02-05 17:24:30 Merge tag 'dwc3-for-v3.9' of git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb into usb-next
git bisect bad # 0 2013-02-05 17:33:09 usb: gadget: pxa25x_udc: convert to udc_start/udc_stop
git bisect good # 15 2013-02-05 18:04:34 usb: gadget: u_serial: convert into a module
git bisect bad # 0 2013-02-05 18:10:01 usb: gadget: composite: introduce usb_gstrings_attach()
git bisect bad # 0 2013-02-05 18:11:55 usb: gadget: cdc2: use function framework for ACM
git bisect bad # 0 2013-02-05 18:13:49 usb: gadget: allocate & giveback serial ports instead hard code them
git bisect good # 10 2013-02-05 18:45:13 usb: gadget: composite: add usb_remove_function()
git bisect good # 33 2013-02-05 19:35:39 usb: gadget: composite: add usb_remove_function()
git bisect good # 30 2013-02-05 20:31:48 Add linux-next specific files for 20130125
Thanks,
Fengguang
View attachment "dmesg-kvm-inn-52453-2013-02-01-16-07-28-3.8.0-rc5-00646-g2f520a0-4" of type "text/plain" (117044 bytes)
View attachment "2f520a0-bisect.log" of type "text/plain" (6698 bytes)
View attachment ".config-bisect" of type "text/plain" (55222 bytes)
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