linux-kernel - Re: [PATCH] usb: missing parentheses in USE_NEW

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Message-ID: <20200104114603.GB1288021@kroah.com>
Date:   Sat, 4 Jan 2020 12:46:03 +0100
From:   "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
To:     atmgnd <atmgnd@...tonmail.com>
Cc:     Alan Stern <stern@...land.harvard.edu>,
        Randy Dunlap <rdunlap@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        USB list <linux-usb@...r.kernel.org>
Subject: Re: [PATCH] usb: missing parentheses in USE_NEW_SCHEME

On Sat, Jan 04, 2020 at 11:02:01AM +0000, atmgnd wrote:
> accroding to bd0e6c9#diff-28615d62e1250eadc353d804f49bc6d6, will try old enumeration
> scheme first for high speed devices. for example, when a high speed device pluged in,
> line 2720 should expand to 0 at the first time. USE_NEW_SCHEME(0, 0 || 0 || 1) === 0.
> but it wrongly expand to 1(alway expand to 1 for high speed device), and change
> USE_NEW_SCHEME to USE_NEW_SCHEME((i) % 2 == (int)(scheme)) may be better ?
> 
> Acked-by: Alan Stern <stern@...land.harvard.edu>
> Signed-off-by: Qi Zhou <atmgnd@...look.com>
> ---
>  drivers/usb/core/hub.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
> index f229ad6952c0..7d17deca7021 100644
> --- a/drivers/usb/core/hub.c
> +++ b/drivers/usb/core/hub.c
> @@ -2692,7 +2692,7 @@ static unsigned hub_is_wusb(struct usb_hub *hub)
>  #define SET_ADDRESS_TRIES	2
>  #define GET_DESCRIPTOR_TRIES	2
>  #define SET_CONFIG_TRIES	(2 * (use_both_schemes + 1))
> -#define USE_NEW_SCHEME(i, scheme)	((i) / 2 == (int)scheme)
> +#define USE_NEW_SCHEME(i, scheme)	((i) / 2 == (int)(scheme))
> 
>  #define HUB_ROOT_RESET_TIME	60	/* times are in msec */
>  #define HUB_SHORT_RESET_TIME	10
> --
> 2.17.1
> 
>

Much better, but your From: name does not match your signed-off-by name :(