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Subject: Re: [PATCH 1/2] staging: irda: Replace mdelay with usleep_range in
 stir421x_fw_upload
To:     Greg KH <gregkh@linuxfoundation.org>
Cc:     devel@driverdev.osuosl.org, samuel@sortiz.org,
        netdev@vger.kernel.org, johan@kernel.org,
        linux-kernel@vger.kernel.org, arvind.yadav.cs@gmail.com,
        davem@davemloft.net
References: <1523410174-1553-1-git-send-email-baijiaju1990@gmail.com>
 <20180411064135.GA28354@kroah.com>
 <d65d1116-7ffd-e289-5379-cc052782700d@gmail.com>
 <20180411080311.GB2137@kroah.com>
 <ecf21a6e-0e99-55dc-54be-3bd633bedbc5@gmail.com>
 <20180411081724.GA4155@kroah.com>
From:   Jia-Ju Bai <baijiaju1990@gmail.com>
Message-ID: <865ad04e-ccbc-6144-c6ea-fc39790f861f@gmail.com>
Date:   Wed, 11 Apr 2018 16:20:22 +0800
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On 2018/4/11 16:17, Greg KH wrote:
> On Wed, Apr 11, 2018 at 04:11:00PM +0800, Jia-Ju Bai wrote:
>>
>> On 2018/4/11 16:03, Greg KH wrote:
>>> On Wed, Apr 11, 2018 at 03:17:10PM +0800, Jia-Ju Bai wrote:
>>>> On 2018/4/11 14:41, Greg KH wrote:
>>>>> On Wed, Apr 11, 2018 at 09:29:34AM +0800, Jia-Ju Bai wrote:
>>>>>> stir421x_fw_upload() is never called in atomic context.
>>>>>>
>>>>>> The call chain ending up at stir421x_fw_upload() is:
>>>>>> [1] stir421x_fw_upload() <- stir421x_patch_device() <- irda_usb_probe()
>>>>>>
>>>>>> irda_usb_probe() is set as ".probe" in struct usb_driver.
>>>>>> This function is not called in atomic context.
>>>>>>
>>>>>> Despite never getting called from atomic context, stir421x_fw_upload()
>>>>>> calls mdelay() to busily wait.
>>>>>> This is not necessary and can be replaced with usleep_range() to
>>>>>> avoid busy waiting.
>>>>>>
>>>>>> This is found by a static analysis tool named DCNS written by myself.
>>>>>> And I also manually check it.
>>>>>>
>>>>>> Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
>>>>>> ---
>>>>>>     drivers/staging/irda/drivers/irda-usb.c | 2 +-
>>>>>>     1 file changed, 1 insertion(+), 1 deletion(-)
>>>>> Please, at the very least, work off of Linus's tree.  There is no
>>>>> drivers/staging/irda/ anymore :)
>>>>>
>>>> Okay, sorry.
>>>> Could you please recommend me a right tree or its git address?
>>> Have you looked in the MAINTAINERS file?  Worst case, always use
>>> linux-next.
>>>
>>> greg k-h
>> Oh, sorry, I did notice the git tree in the MAINTAINERS file.
>> I always used linux-stable.
> linux-stable is almost never the tree to use as it is almost always
> 12000 patches behind what is in Linus's tree and about 20000 changes
> behind linux-next.
>

Okay, I now know why many of my patches were not replied.
I should choose correct tree in the MAINTAINERS file.
Thanks :)


Best wishes,
Jia-Ju Bai