linux-kernel - Re: Fw: usbcore missing parentheses in USE_NEW

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Date:   Sat, 04 Jan 2020 03:24:04 +0000
From:   atmgnd <atmgnd@...tonmail.com>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        USB list <linux-usb@...r.kernel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
Subject: Re: Fw: usbcore missing parentheses in USE_NEW_SCHEME

Greg Kroah-Hartman:
here is the new patch:


>From 85f01b89d050a988f4d9fc78232de47e793c6a7c Mon Sep 17 00:00:00 2001
From: Qi.Zhou <atmgnd@...look.com>
Date: Wed, 1 Jan 2020 21:27:13 +0800
Subject: [PATCH] usb: hub: missing parentheses in USE_NEW_SCHEME

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



Sent with ProtonMail Secure Email.

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Thursday, January 2, 2020 11:22 PM, Alan Stern <stern@...land.harvard.edu> wrote:

> On Wed, 1 Jan 2020, Randy Dunlap wrote:
>
> > [adding linux-usb mailing list]
> > On 1/1/20 6:46 AM, atmgnd wrote:
> >
> > > I think there is missing parentheses in macro USE_NEW_SCHEME, it should be:
> > > #define USE_NEW_SCHEME(i, scheme) ((i) / 2 == (int)(scheme))
> > > causes a fail wiht "device descriptor read/64, error -110" using my usb drive on vmware using usb 3.0 hub.
> > > from https://github.com/torvalds/linux/commit/25244227158e1502062041365a439a54cb8fe673#diff-28615d62e1250eadc353d804f49bc6d6
> > > someone changed USE_NEW_SCHEME, but without parentheses for second parameter. as result. in fuction use_new_scheme when old_scheme_first is 1, use_new_scheme will return 1 always(actullay is should return 0). it also make https://github.com/torvalds/linux/commit/bd0e6c9614b95352eb31d0207df16dc156c527fa#diff-28615d62e1250eadc353d804f49bc6d6 fails.
> > > I cannot use git send-mail, there some issue with my network provider. patch below, :
> > > From 85f01b89d050a988f4d9fc78232de47e793c6a7c Mon Sep 17 00:00:00 2001
> > > From: atmgnd atmgnd@...look.com
> > > Date: Wed, 1 Jan 2020 21:27:13 +0800
> > > Subject: [PATCH] usb: hub: missing parentheses in USE_NEW_SCHEME
> > > 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 ?
> > >
> > > Signed-off-by: atmgnd 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
>
> atmgnd:
>
> Please resend this patch to Greg Kroah-Hartman
> gregkh@...uxfoundation.org with the appropriate CC's. Also, your
> Signed-off-by: line should contain a real name, not an email userid
> (you probably don't use "atmgnd" as your signature on legal
> documents!).
>
> When you resend the patch, you can include:
>
> Acked-by: Alan Stern stern@...land.harvard.edu
>
> Alan Stern