linux-kernel - RE: [EXT] Re: [PATCH 1/1] usb: gadget: call usb_gadget_check

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Date:   Thu, 29 Jun 2023 03:40:18 +0000
From:   Frank Li <frank.li@....com>
To:     Roger Quadros <rogerq@...nel.org>,
        "r-gunasekaran@...com" <r-gunasekaran@...com>,
        "imx@...ts.linux.dev" <imx@...ts.linux.dev>,
        Jun Li <jun.li@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Elson Roy Serrao <quic_eserrao@...cinc.com>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Jó Ágila Bitsch <jgilab@...il.com>,
        Prashanth K <quic_prashk@...cinc.com>,
        Peter Chen <peter.chen@...nel.org>,
        "open list:USB SUBSYSTEM" <linux-usb@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: RE: [EXT] Re: [PATCH 1/1] usb: gadget: call usb_gadget_check_config()
 to verify UDC capability



> -----Original Message-----
> From: Roger Quadros <rogerq@...nel.org>
> Sent: Wednesday, June 28, 2023 10:23 PM
> To: Frank Li <frank.li@....com>; r-gunasekaran@...com; imx@...ts.linux.dev;
> Jun Li <jun.li@....com>; Greg Kroah-Hartman
> <gregkh@...uxfoundation.org>; Elson Roy Serrao
> <quic_eserrao@...cinc.com>; Thinh Nguyen
> <Thinh.Nguyen@...opsys.com>; Andy Shevchenko
> <andriy.shevchenko@...ux.intel.com>; Jó Ágila Bitsch <jgilab@...il.com>;
> Prashanth K <quic_prashk@...cinc.com>; Peter Chen
> <peter.chen@...nel.org>; open list:USB SUBSYSTEM <linux-
> usb@...r.kernel.org>; open list <linux-kernel@...r.kernel.org>
> Subject: [EXT] Re: [PATCH 1/1] usb: gadget: call usb_gadget_check_config()
> to verify UDC capability
> 
> Caution: This is an external email. Please take care when clicking links or
> opening attachments. When in doubt, report the message using the 'Report
> this email' button
> 
> 
> On 29/06/2023 03:54, Frank Li wrote:
> > The legacy gadget driver omitted calling usb_gadget_check_config()
> > to ensure that the USB device controller (UDC) has adequate resources,
> > including sufficient endpoint numbers and types, to support the given
> > configuration.
> >
> > Previously, usb_add_config() was solely invoked by the legacy gadget
> > driver. Adds the necessary usb_gadget_check_config() after the bind()
> > operation to fix the issue.
> 
> You have only fixed composite.c. Not all gadget drivers use composite.c
> so it will be still broken for them.
> 
> Please also add default sane configuration in CDNS3 so it works even
> if usb_gadget_check_config() is not invoked.

Which one was not call usb_add_config()?
DWC3 also use
 .check_config		= dwc3_gadget_check_config, 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/usb/dwc3/gadget.c 

I think it is not correct by assume UDC can support specific config
at gadget function driver. 
Add default value of CDNS3 actually hidden potential problem. 

I don't suggest it before fixed hidden potential problem. 

Frank  

> 
> >
> > Fixes: dce49449e04f ("usb: cdns3: allocate TX FIFO size according to
> composite EP number")
> > Reported-by: Ravi Gunasekaran <r-gunasekaran@...com>
> > Signed-off-by: Frank Li <Frank.Li@....com>
> > ---
> >  drivers/usb/gadget/composite.c | 4 ++++
> >  1 file changed, 4 insertions(+)
> >
> > diff --git a/drivers/usb/gadget/composite.c
> b/drivers/usb/gadget/composite.c
> > index 1b3489149e5e..dd9b90481b4c 100644
> > --- a/drivers/usb/gadget/composite.c
> > +++ b/drivers/usb/gadget/composite.c
> > @@ -1125,6 +1125,10 @@ int usb_add_config(struct usb_composite_dev
> *cdev,
> >               goto done;
> >
> >       status = bind(config);
> > +
> > +     if (status == 0)
> > +             status = usb_gadget_check_config(cdev->gadget);
> > +
> >       if (status < 0) {
> >               while (!list_empty(&config->functions)) {
> >                       struct usb_function             *f;
> 
> --
> cheers,
> -roger