linux-kernel - [rtmutex-tester] WARNING: at drivers/base/core.c:569 device_create

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Date:	Fri, 29 Mar 2013 10:17:04 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Felipe Balbi <balbi@...com>, linux-kernel@...r.kernel.org
Subject: [rtmutex-tester] WARNING: at drivers/base/core.c:569
 device_create_file()

Hi Kay,

I got the below warning and the first "bad" commit is

commit 8f46baaa7ec6cd0851794020b31958e64679dd26
Author: Felipe Balbi <balbi@...com>
Date:   Wed Feb 20 10:31:42 2013 +0200

    base: core: WARN() about bogus permissions on device attributes
    
    Whenever a struct device_attribute is registered
    with mismatched permissions - read permission without
    a show routine or write permission without store
    routine - we will issue a big warning so we catch
    those early enough.
    
    Signed-off-by: Felipe Balbi <balbi@...com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

[   11.581068] bus: 'rttest': add device rttest0
[   11.581813] ------------[ cut here ]------------
[   11.582568] WARNING: at /c/kernel-tests/src/linux/drivers/base/core.c:569 device_create_file+0x5a/0xa0()
[   11.584035] Write permission without 'store'
[   11.584793] Pid: 1, comm: swapper/0 Not tainted 3.9.0-rc2-next-20130318 #21
[   11.585902] Call Trace:
[   11.586318]  [<8102d888>] warn_slowpath_common+0x68/0xa0
[   11.587146]  [<8151b77a>] ? device_create_file+0x5a/0xa0
[   11.587982]  [<8151b77a>] ? device_create_file+0x5a/0xa0
[   11.588820]  [<8102d91e>] warn_slowpath_fmt+0x2e/0x30
[   11.589618]  [<8151b77a>] device_create_file+0x5a/0xa0
[   11.590523]  [<81081faa>] init_rttest+0xaa/0x150
[   11.591255]  [<81082270>] ? handle_op+0x220/0x220
[   11.591994]  [<81081f00>] ? sysfs_test_status+0xf0/0xf0
[   11.592838]  [<821f7a92>] do_one_initcall+0x7f/0x128
[   11.593642]  [<821f7c1e>] kernel_init_freeable+0xe3/0x182
[   11.594492]  [<821f74d1>] ? do_early_param+0x7a/0x7a
[   11.595291]  [<81c8ce2b>] kernel_init+0xb/0xd0
[   11.596026]  [<81cac5f7>] ret_from_kernel_thread+0x1b/0x28
[   11.596990]  [<81c8ce20>] ? rest_init+0x130/0x130
[   11.597749] ---[ end trace 124d60cbc476f331 ]---

git bisect start 0e78c0989334e9c1d578ba25621de14e8441d8b4 08637024ab77f7defff1627cc8aedc2c6679ad8a --
git bisect good 5b4ab7cbdf1c0d93f5e7e14671c8b34ff081b928  #    10  2013-03-18 18:56:02  Merge remote-tracking branch 'slab/for-next'
git bisect  bad a9dd67e06c062671c880f62087a6fe6d4096ec39  #     0  2013-03-18 19:00:10  Revert "gpio/palmas: add in GPIO support for palmas charger"
git bisect good e8196b632b87f568668394fdc8b5053aa7918885  #    10  2013-03-18 19:05:59  Merge remote-tracking branch 'regmap/for-next'
git bisect good 157dfaac1f2922a3cbd90685339511cb97cad225  #    10  2013-03-18 19:12:52  staging: dwc2: fix compiler warnings
git bisect good a14592896023adcab12307774c89284ce0744ce2  #    10  2013-03-18 19:17:44  staging: comedi: ni_labpc: fix common detach
git bisect  bad 9b53d29f3c8d2b9bfe73eb1dfb78a53b8c0fa2d7  #     0  2013-03-18 19:21:54  Merge remote-tracking branch 'usb/usb-next'
git bisect  bad 50418d050eaa3998e4be2936f5f05718909122ee  #     0  2013-03-18 19:24:22  Merge remote-tracking branch 'tty/tty-next'
git bisect good d9a9770f7baea6171aa66e4070bdb9bf6f0402f3  #    10  2013-03-18 19:30:13  Merge remote-tracking branch 'leds/for-next'
git bisect good 20cc225bab6709408840e4400cd1a5c2b28c7a52  #    10  2013-03-18 19:37:15  tty: Fix spinlock flavor in non-atomic __tty_hangup()
git bisect good afa80ccb4c7d39702dfb0832ce02a054848191a8  #    10  2013-03-18 19:43:40  sysrq: fix inconstistent help message of sysrq key
git bisect  bad 8f46baaa7ec6cd0851794020b31958e64679dd26  #     0  2013-03-18 19:48:42  base: core: WARN() about bogus permissions on device attributes
git bisect good be871b7e54711479d3b9d3617d49898770830db2  #    10  2013-03-18 19:54:14  device: separate all subsys mutexes
git bisect good be871b7e54711479d3b9d3617d49898770830db2  #    30  2013-03-18 20:01:22  device: separate all subsys mutexes
git bisect  bad 0e78c0989334e9c1d578ba25621de14e8441d8b4  #     0  2013-03-18 20:06:35  Add linux-next specific files for 20130318
git bisect good 3154d2d99b2718f54136409fc3836a90e896eedc  #    30  2013-03-18 20:16:20  Revert "base: core: WARN() about bogus permissions on device attributes"
git bisect  bad 0e78c0989334e9c1d578ba25621de14e8441d8b4  #     0  2013-03-18 20:20:59  Add linux-next specific files for 20130318

Thanks,
Fengguang

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