linux-kernel - Re: [PATCH 3/6] UBI: Fastmap: Ensure that all fastmap work is done upon WL shutdown

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Message-ID: <54809831.1060503@nod.at>
Date:	Thu, 04 Dec 2014 18:21:53 +0100
From:	Richard Weinberger <richard@....at>
To:	Tanya Brokhman <tlinder@...eaurora.org>, dedekind1@...il.com
CC:	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/6] UBI: Fastmap: Ensure that all fastmap work is done
 upon WL shutdown

Am 04.12.2014 um 17:44 schrieb Tanya Brokhman:
> On 11/27/2014 5:38 PM, Artem Bityutskiy wrote:
>> On Mon, 2014-11-24 at 14:20 +0100, Richard Weinberger wrote:
>>> ...otherwise the deferred work might run after datastructures
>>> got freed and corrupt memory.
>>>
>>> Signed-off-by: Richard Weinberger <richard@....at>
>>> ---
>>>   drivers/mtd/ubi/wl.c | 3 +++
>>>   1 file changed, 3 insertions(+)
>>>
>>> diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c
>>> index 7f135df..cb2e571 100644
>>> --- a/drivers/mtd/ubi/wl.c
>>> +++ b/drivers/mtd/ubi/wl.c
>>> @@ -2041,6 +2041,9 @@ static void protection_queue_destroy(struct ubi_device *ubi)
>>>   void ubi_wl_close(struct ubi_device *ubi)
>>>   {
>>>       dbg_wl("close the WL sub-system");
>>> +#ifdef CONFIG_MTD_UBI_FASTMAP
>>> +    flush_work(&ubi->fm_work);
>>> +#endif
>>
>> If you are using the work infrastructure implemented in wl.c, then
>> fastmap work should be no different to any other work. And we do flush
>> all works in 'shutdown_work()'. The fastmap work should be flushed there
>> too.
> 
> I tend to agree with Artem. Could you please move it to shutdown_work()? I'm asking because I do want to pick up all the bug fixes patches, but not going to pick up the "cleaning
> up" patches at this point.

Okay. You have overruled me. :-)

Thanks,
//richard

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