linux-kernel - Re: [PATCH]usb: serial: pl2303: rm id

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Message-ID: <20111115050426.GA3738@udknight.homenetwork>
Date:	Tue, 15 Nov 2011 13:04:26 +0800
From:	wangyanqing <udknight@...il.com>
To:	Greg KH <gregkh@...e.de>
Cc:	wd@...x.de, stable@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH]usb: serial: pl2303: rm id

On Sun, Nov 13, 2011 at 07:58:15PM -0800, Greg KH wrote:
> On Mon, Nov 14, 2011 at 09:11:30AM +0800, wangyanqing wrote:
> > On Thu, Nov 10, 2011 at 02:04:08PM +0800, wangyanqing wrote:
> > > I get report from customer that his usb-serial
> > > converter doesn't work well,it sometimes work,
> > > but sometimes it doesn't.
> > > 
> > > The usb-serial converter's id:
> > > vendor_id product_id
> > > 0x4348    0x5523
> > > 
> > > Then I search the usb-serial codes, and there are
> > > two drivers announce support this device, pl2303
> > > and ch341, commit 026dfaf1 cause it. Through many
> > > times to test, ch341 works well with this device,
> > > and pl2303 doesn't work quite often(it just work quite little).
> > > 
> > > ch341 works well with this device, so we doesn't
> > > need pl2303 to support.I try to revert 026dfaf1 first,
> > > but it failed. So I prepare this patch by hand to revert it.
> > > 
> > > Signed-off-by: Wang YanQing <Udknight@...il.com>
> > > ---
> > >  drivers/usb/serial/pl2303.c |    1 -
> > >  drivers/usb/serial/pl2303.h |    4 ----
> > >  2 files changed, 0 insertions(+), 5 deletions(-)
> > > 
> > > diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
> > > index 9083d1e..fc2d66f 100644
> > > --- a/drivers/usb/serial/pl2303.c
> > > +++ b/drivers/usb/serial/pl2303.c
> > > @@ -91,7 +91,6 @@ static const struct usb_device_id id_table[] = {
> > >  	{ USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) },
> > >  	{ USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) },
> > >  	{ USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) },
> > > -	{ USB_DEVICE(WINCHIPHEAD_VENDOR_ID, WINCHIPHEAD_USBSER_PRODUCT_ID) },
> > >  	{ USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) },
> > >  	{ }					/* Terminating entry */
> > >  };
> > > diff --git a/drivers/usb/serial/pl2303.h b/drivers/usb/serial/pl2303.h
> > > index 3d10d7f..c38b8c0 100644
> > > --- a/drivers/usb/serial/pl2303.h
> > > +++ b/drivers/usb/serial/pl2303.h
> > > @@ -145,10 +145,6 @@
> > >  #define ADLINK_VENDOR_ID		0x0b63
> > >  #define ADLINK_ND6530_PRODUCT_ID	0x6530
> > >  
> > > -/* WinChipHead USB->RS 232 adapter */
> > > -#define WINCHIPHEAD_VENDOR_ID		0x4348
> > > -#define WINCHIPHEAD_USBSER_PRODUCT_ID	0x5523
> > > -
> > >  /* SMART USB Serial Adapter */
> > >  #define SMART_VENDOR_ID	0x0b8c
> > >  #define SMART_PRODUCT_ID	0x2303
> > > -- 
> > > 1.7.3.4
> > > 
> > Hi all.
> > Maybe it should be noticed that not only one usb-serial converter base 
> > this chip have this issue, but there are about 50(even more) usb-serial 
> > coverter lines have the same issue, so we can't ignore it.
> > Of course we can make all the drivers work well, but we should make it
> > useful at the first.
> 
> Why not add the device id to the other driver at the same time, that
> would ensure that the device continues to work, right?
> 
> thanks,
> 
> greg k-h

Ok greg, thanks for your reply!
But I means maybe I make a very very "bad" subject in the email at all!
There are ch341 and pl2303 , two drivers announce to support this device,
ch341 works well and pl2303 does't work always.

Maybe I should make the email "shorter" next time.
This is the origin email.
https://lkml.org/lkml/2011/11/10/66

We don't need to add the device id to the other driver, ch341 have done it!!
Please looks at ch341.c:76 line
"
       { USB_DEVICE(0x4348, 0x5523) }, "

Thanks again.
 
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