netdev - Re: [PATCH v2] b43: Replace mdelay with usleep_range in b43_radio_2057_init

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Date:   Tue, 9 Jan 2018 09:35:41 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Jia-Ju Bai <baijiaju1990@...il.com>
Cc:     Larry.Finger@...inger.net, kvalo@...eaurora.org,
        kstewart@...uxfoundation.org, johannes.berg@...el.com,
        tiwai@...e.de, colin.king@...onical.com,
        andrew.zaborowski@...el.com, linux-kernel@...r.kernel.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        b43-dev@...ts.infradead.org
Subject: Re: [PATCH v2] b43: Replace mdelay with usleep_range in
 b43_radio_2057_init_post

On Tue, Jan 09, 2018 at 09:40:06AM +0800, Jia-Ju Bai wrote:
> b43_radio_2057_init_post is not called in an interrupt handler
> nor holding a spinlock.
> The function mdelay in it can be replaced with usleep_range, 
> to reduce busy wait.
> 
> Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
> ---
> v2:
> * Replace mdelay with usleep_range, instead of msleep in v1.
>   Thank Larry for good advice.
> ---
>  drivers/net/wireless/broadcom/b43/phy_n.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/broadcom/b43/phy_n.c b/drivers/net/wireless/broadcom/b43/phy_n.c
> index a5557d7..f2a2f41 100644
> --- a/drivers/net/wireless/broadcom/b43/phy_n.c
> +++ b/drivers/net/wireless/broadcom/b43/phy_n.c
> @@ -1031,7 +1031,7 @@ static void b43_radio_2057_init_post(struct b43_wldev *dev)
>  
>  	b43_radio_set(dev, R2057_RFPLL_MISC_CAL_RESETN, 0x78);
>  	b43_radio_set(dev, R2057_XTAL_CONFIG2, 0x80);
> -	mdelay(2);
> +	usleep_range(2000, 3000);

Where did 3000 come from?  Are you sure about that?

thanks,

greg k-h