netdev - Re: [PATCH 2/2] staging: irda: Replace mdelay with usleep_range in irda_usb

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Message-ID: <20180411070820.GF10795@localhost>
Date:   Wed, 11 Apr 2018 09:08:20 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Jia-Ju Bai <baijiaju1990@...il.com>
Cc:     samuel@...tiz.org, gregkh@...uxfoundation.org, davem@...emloft.net,
        johan@...nel.org, arvind.yadav.cs@...il.com,
        netdev@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] staging: irda: Replace mdelay with usleep_range in
 irda_usb_probe

On Wed, Apr 11, 2018 at 09:33:55AM +0800, Jia-Ju Bai wrote:
> irda_usb_probe() is never called in atomic context.
> 
> irda_usb_probe() is only set as ".probe" in struct usb_driver.
> 
> Despite never getting called from atomic context, irda_usb_probe()
> 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>

Reviewed-by: Johan Hovold <johan@...nel.org>