linux-kernel - Re: [PATCH] input: twl4030-vibra: Fix ERROR: Bad of_node

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Date:	Tue, 28 Jul 2015 22:23:08 +0200
From:	Belisko Marek <marek.belisko@...il.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	linux-input@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	"Dr. H. Nikolaus Schaller" <hns@...delico.com>,
	Rob Herring <robh+dt@...nel.org>,
	Grant Likely <grant.likely@...aro.org>
Subject: Re: [PATCH] input: twl4030-vibra: Fix ERROR: Bad of_node_put() warning

Hi Dmitry,

On Thu, Jul 23, 2015 at 10:53 PM, Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
> On Thu, Jul 23, 2015 at 10:38:34PM +0200, Marek Belisko wrote:
>> Fix following:
>> [    8.862274] ERROR: Bad of_node_put() on /ocp/i2c@...70000/twl@...audio
>> [    8.869293] CPU: 0 PID: 1003 Comm: modprobe Not tainted 4.2.0-rc2-letux+ #1175
>> [    8.876922] Hardware name: Generic OMAP36xx (Flattened Device Tree)
>> [    8.883514] [<c00159e0>] (unwind_backtrace) from [<c0012488>] (show_stack+0x10/0x14)
>> [    8.891693] [<c0012488>] (show_stack) from [<c05cb810>] (dump_stack+0x78/0x94)
>> [    8.899322] [<c05cb810>] (dump_stack) from [<c02cfd5c>] (kobject_release+0x68/0x7c)
>> [    8.907409] [<c02cfd5c>] (kobject_release) from [<bf0040c4>] (twl4030_vibra_probe+0x74/0x188 [twl4030_vibra])
>> [    8.917877] [<bf0040c4>] (twl4030_vibra_probe [twl4030_vibra]) from [<c03816ac>] (platform_drv_probe+0x48/0x90)
>> [    8.928497] [<c03816ac>] (platform_drv_probe) from [<c037feb4>] (really_probe+0xd4/0x238)
>> [    8.937103] [<c037feb4>] (really_probe) from [<c0380160>] (driver_probe_device+0x30/0x48)
>> [    8.945678] [<c0380160>] (driver_probe_device) from [<c03801e0>] (__driver_attach+0x68/0x8c)
>> [    8.954589] [<c03801e0>] (__driver_attach) from [<c037ea60>] (bus_for_each_dev+0x50/0x84)
>> [    8.963226] [<c037ea60>] (bus_for_each_dev) from [<c037f828>] (bus_add_driver+0xcc/0x1e4)
>> [    8.971832] [<c037f828>] (bus_add_driver) from [<c0380b60>] (driver_register+0x9c/0xe0)
>> [    8.980255] [<c0380b60>] (driver_register) from [<c00097e0>] (do_one_initcall+0x100/0x1b8)
>> [    8.988983] [<c00097e0>] (do_one_initcall) from [<c00b8008>] (do_init_module+0x58/0x1c0)
>> [    8.997497] [<c00b8008>] (do_init_module) from [<c00b8cac>] (SyS_init_module+0x54/0x64)
>> [    9.005950] [<c00b8cac>] (SyS_init_module) from [<c000ed20>] (ret_fast_syscall+0x0/0x54)
>> [    9.015838] input: twl4030:vibrator as /devices/platform/68000000.ocp/48070000.i2c/i2c-0/0-0048/48070000.i2c:twl@48:audio/input/input2
>>
>> node passed to of_find_node_by_name is put inside that function and new node
>> is returned if found. Free returned node not already freed node.
>
> Hmm, if of_find_node_by_name() "puts" passed in node should we not "get"
> it before calling of_find_node_by_name()? The node pointer in question
> is simply copied from parent device.
I'm not sure. what I can say is that I cannot see such error in 4.1
but only in 4.2-rcx.
Adding Grant and Rob to CC, maybe they know what should be done and
why I see such error in 4.2-rcx.
>
> Thanks.
>
>>
>> Signed-off-by: Marek Belisko <marek@...delico.com>
>> ---
>>  drivers/input/misc/twl4030-vibra.c | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/input/misc/twl4030-vibra.c b/drivers/input/misc/twl4030-vibra.c
>> index fc17b95..10c4e3d 100644
>> --- a/drivers/input/misc/twl4030-vibra.c
>> +++ b/drivers/input/misc/twl4030-vibra.c
>> @@ -183,7 +183,8 @@ static bool twl4030_vibra_check_coexist(struct twl4030_vibra_data *pdata,
>>       if (pdata && pdata->coexist)
>>               return true;
>>
>> -     if (of_find_node_by_name(node, "codec")) {
>> +     node = of_find_node_by_name(node, "codec");
>> +     if (node) {
>>               of_node_put(node);
>>               return true;
>>       }
>> --
>> 1.9.1
>>
>
> --
> Dmitry

BR,

marek

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