linux-kernel - Re: [PATCH] edac: Don't give write permission to read-only file

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Date:	Tue, 30 Apr 2013 13:25:52 +0300
From:	Felipe Balbi <balbi@...com>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
CC:	<mchehab@...hat.com>, <arozansk@...hat.com>,
	<gregkh@...uxfoundation.org>, <bp@...en8.de>, <balbi@...com>,
	<linux-edac@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] edac: Don't give write permission to read-only file

Hi,

On Tue, Apr 30, 2013 at 03:17:16PM +0530, Srivatsa S. Bhat wrote:
> I get the following warning on boot:
> 
> ------------[ cut here ]------------
> WARNING: at drivers/base/core.c:575 device_create_file+0x9a/0xa0()
> Hardware name:  -[8737R2A]-
> Write permission without 'store'
> Modules linked in: sb_edac(+) edac_core i2c_i801 i2c_core lpc_ich mfd_core
> shpchp wmi ioatdma dca mlx4_core be2net ext4 mbcache jbd2 sd_mod crc_t10dif
> aesni_intel ablk_helper cryptd lrw aes_x86_64 xts gf128mul mpt2sas
> scsi_transport_sas raid_class dm_mirror dm_region_hash dm_log dm_mod
> Pid: 599, comm: modprobe Tainted: G        W    3.9.0-56847d8 #1
> Call Trace:
>  [<ffffffff8105865f>] warn_slowpath_common+0x7f/0xc0
>  [<ffffffff81058756>] warn_slowpath_fmt+0x46/0x50
>  [<ffffffff813b496a>] device_create_file+0x9a/0xa0
>  [<ffffffffa02508ce>] edac_create_csrow_object+0xfe/0x180 [edac_core]
>  [<ffffffffa02509ea>] edac_create_csrow_objects+0x9a/0x190 [edac_core]
>  [<ffffffffa0250d48>] edac_create_sysfs_mci_device+0x268/0x2d0 [edac_core]
>  [<ffffffffa024df6c>] edac_mc_add_mc+0xfc/0x230 [edac_core]
>  [<ffffffffa0265e29>] sbridge_register_mci+0x1d9/0x270 [sb_edac]
>  [<ffffffffa0265fa0>] sbridge_probe+0xe0/0x18c [sb_edac]
>  [<ffffffff812ddcce>] local_pci_probe+0x4e/0x90
>  [<ffffffff812ddde1>] __pci_device_probe+0xd1/0xe0
>  [<ffffffff813c5193>] ? pm_runtime_barrier+0x73/0xe0
>  [<ffffffff812df122>] ? pci_dev_get+0x22/0x30
>  [<ffffffff812df16a>] pci_device_probe+0x3a/0x60
>  [<ffffffff815bf9c0>] ? _raw_spin_unlock_irq+0x30/0x50
>  [<ffffffff813b7f2c>] really_probe+0x6c/0x320
>  [<ffffffff813b8227>] driver_probe_device+0x47/0xa0
>  [<ffffffff813b832b>] __driver_attach+0xab/0xb0
>  [<ffffffff813b8280>] ? driver_probe_device+0xa0/0xa0
>  [<ffffffff813b8280>] ? driver_probe_device+0xa0/0xa0
>  [<ffffffff813b5fb4>] bus_for_each_dev+0x94/0xb0
>  [<ffffffff813b7bee>] driver_attach+0x1e/0x20
>  [<ffffffff813b75c0>] bus_add_driver+0x200/0x280
>  [<ffffffffa0269000>] ? 0xffffffffa0268fff
>  [<ffffffff813b88d4>] driver_register+0x74/0x160
>  [<ffffffffa0269000>] ? 0xffffffffa0268fff
>  [<ffffffff812df274>] __pci_register_driver+0x64/0x70
>  [<ffffffffa0269036>] sbridge_init+0x36/0x62 [sb_edac]
>  [<ffffffff81002132>] do_one_initcall+0x132/0x1c0
>  [<ffffffff810d4844>] do_init_module+0x44/0x1b0
>  [<ffffffff810d6dd9>] load_module+0x569/0x6c0
>  [<ffffffff812cbea0>] ? ddebug_dyndbg_boot_param_cb+0x60/0x60
>  [<ffffffff810d3780>] ? module_sect_show+0x30/0x30
>  [<ffffffff810d7096>] sys_init_module+0x96/0xc0
>  [<ffffffff815c9819>] system_call_fastpath+0x16/0x1b
> ---[ end trace 1ad1039fa2c3d483 ]---
> 
> Drilling down, this is related to dynamic channel ce_count attribute files
> sporting a S_IWUSR mode without a ->store() function. Looking around, it
> appears that they aren't supposed to have a ->store() function. So remove
> the bogus write permission to get rid of the warning.
> 
> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>

thanks for doing this:

Acked-by: Felipe Balbi <balbi@...com>

-- 
balbi

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