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From: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
To: Oliver Neukum <oneukum@suse.com>
Cc: Greg KH <greg@kroah.com>,
	Colin Ian King <colin.king@canonical.com>,
	Arnd Bergmann <arnd@arndb.de>,
	linux-usb@vger.kernel.org
Subject: Re: [PATCH] USB: cdc-wdm: Call wake_up_all() when clearing WDM_IN_USE bit.
Date: Mon, 25 May 2020 22:32:38 +0900	[thread overview]
Message-ID: <4a686d9a-d09f-44f3-553c-bcf0bd8a8ea1@i-love.sakura.ne.jp> (raw)
In-Reply-To: <1590408381.2838.4.camel@suse.com>

On 2020/05/25 21:06, Oliver Neukum wrote:
> Am Freitag, den 22.05.2020, 17:26 +0900 schrieb Tetsuo Handa:
>> On 2020/05/22 17:04, Oliver Neukum wrote:
>>> May I ask you to redo the patch with comments added stating
>>> that the wake up is done for the sake of wdm_flush(), change
>>> the description and add the link to syzkaller?
>>
>> You can take over this patch. syzbot tried this patch on 2020/02/11 01:23 at
>> https://syzkaller.appspot.com/bug?id=e7b761593b23eb50855b9ea31e3be5472b711186 ,
>> but this patch did not solve the problem syzbot has found. Thus, I don't add
>> a link to syzkaller...
> 
> Hi,
> 
> this is odd. I looked at the driver and it looks to me like
> pre/post_reset() is the only other place that touches WDM_IN_USE.
> And it does so correctly. Any idea what could be wrong?

I haven't understood the root cause of this problem. You were in the thread at
https://groups.google.com/forum/#!msg/syzkaller-bugs/q3QMjt_t83c/GqP58GaTAQAJ .
My patch was made from that thread (which simply makes sure to call wake_up_all()
when clearing WDM_IN_USE bit) apart from the root cause of this problem.

  reply	other threads:[~2020-05-25 13:33 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-20 23:31 [PATCH] USB: cdc-wdm: Call wake_up_all() when clearing WDM_IN_USE bit Tetsuo Handa
2020-05-21  7:33 ` Greg KH
2020-05-21 10:01   ` Tetsuo Handa
2020-05-21 19:50     ` Oliver Neukum
2020-05-21 22:48       ` Tetsuo Handa
2020-05-22  8:04         ` Oliver Neukum
2020-05-22  8:26           ` Tetsuo Handa
2020-05-25 12:06             ` Oliver Neukum
2020-05-25 13:32               ` Tetsuo Handa [this message]
2020-05-27  4:47                 ` Tetsuo Handa
2020-05-28 15:18                   ` Andrey Konovalov
2020-05-28 16:03                     ` Tetsuo Handa
2020-05-28 19:03                       ` Andrey Konovalov
2020-05-28 19:40                         ` Alan Stern
2020-05-28 19:51                           ` Andrey Konovalov
2020-05-28 20:58                             ` Alan Stern
2020-05-29 20:41                               ` Andrey Konovalov
2020-05-30  0:42                                 ` Tetsuo Handa
2020-05-30  1:10                                   ` Alan Stern
2020-05-30  4:58                                     ` Tetsuo Handa
2020-06-24 11:57                                       ` Oliver Neukum
2020-06-24 12:48                                         ` Tetsuo Handa
2020-05-30  6:08                                   ` Greg Kroah-Hartman
2020-06-01 12:26                                   ` Andrey Konovalov
2020-05-30 15:25                               ` Oliver Neukum
2020-05-30 15:47                                 ` Alan Stern
2020-06-08  2:24                                   ` Tetsuo Handa
2020-06-18  0:48                                     ` Tetsuo Handa
2020-06-19 13:56                                       ` Andrey Konovalov
2020-06-23 11:20                                         ` Tetsuo Handa
2020-07-02  5:44                                           ` Tetsuo Handa
2020-07-02  7:24                                             ` Oliver Neukum
2020-07-15  6:15                                               ` Tetsuo Handa
2020-08-10 10:47                                                 ` Tetsuo Handa
2020-09-24 15:09                                                   ` [PATCH] USB: cdc-wdm: Make wdm_flush() interruptible and add wdm_fsync() Tetsuo Handa
2020-09-28 14:17                                                     ` [PATCH (repost)] " Tetsuo Handa
2020-06-25  9:56                                     ` [PATCH] USB: cdc-wdm: Call wake_up_all() when clearing WDM_IN_USE bit Oliver Neukum
2020-06-25 11:15                                       ` Tetsuo Handa
2020-07-01  7:08                                     ` [TEST]Re: " Oliver Neukum

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