linux-kernel - Re: [PATCH 1/3] mmc: wbsd: Replace mdelay with usleep_range in wbsd

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Date:   Thu, 12 Apr 2018 09:34:15 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Pierre Ossman <pierre@...man.eu>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] mmc: wbsd: Replace mdelay with usleep_range in
 wbsd_init



On 2018/4/11 23:04, Ulf Hansson wrote:
> On 11 April 2018 at 04:46, Jia-Ju Bai <baijiaju1990@...il.com> wrote:
>> wbsd_init() is never called in atomic context.
>>
>> The call chains ending up at wbsd_init() are:
>> [1] wbsd_init() <- wbsd_probe()
>> [2] wbsd_init() <- wbsd_pnp_probe()
>>
>> wbsd_probe() is set as ".probe" in struct platform_driver.
>> wbsd_pnp_probe() is set as ".probe" in struct pnp_driver.
>> These functions are not called in atomic context.
>>
>> Despite never getting called from atomic context, wbsd_init()
>> 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@...il.com>
> The patch is good, however I think you should squash all three in this
> series into one. For obvious reasons.

Hello, Ulf.
Thanks for your reply and advice :)
I will follow it in my future patches.


Best wishes,
Jia-Ju Bai