linux-kernel - Re: [PATCH v2 2/3] usb: dwc3: gadget: Add support for snps,reserved-endpoints property

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Message-ID: <20250213012507.rzmyweziti4rbtz7@synopsys.com>
Date: Thu, 13 Feb 2025 01:25:11 +0000
From: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi
	<balbi@...nel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Rob Herring
	<robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
	<conor+dt@...nel.org>, Ferry Toth <fntoth@...il.com>
Subject: Re: [PATCH v2 2/3] usb: dwc3: gadget: Add support for
 snps,reserved-endpoints property

On Thu, Feb 13, 2025, Thinh Nguyen wrote:
> On Wed, Feb 12, 2025, Andy Shevchenko wrote:
> > On Wed, Feb 12, 2025 at 01:10:17AM +0000, Thinh Nguyen wrote:
> > > On Mon, Feb 03, 2025, Andy Shevchenko wrote:
> > > > The snps,reserved-endpoints property lists the reserved endpoints
> > > > that shouldn't be used for normal transfers. Add support for that
> > > > to the driver.
> > 
> > > > While at it, make sure we don't crash by a sudden access to those
> > > > endpoints in the gadget driver.
> > 
> > ^^^ (1)
> > 
> > ...
> > 
> > > >  	/* Reset resource allocation flags */
> > > > -	for (i = resource_index; i < dwc->num_eps && dwc->eps[i]; i++)
> > > > -		dwc->eps[i]->flags &= ~DWC3_EP_RESOURCE_ALLOCATED;
> > > > +	for (i = resource_index; i < dwc->num_eps; i++) {
> > > > +		dep = dwc->eps[i];
> > > > +		if (!dep)
> > > > +			continue;
> > > > +
> > > > +		dep->flags &= ~DWC3_EP_RESOURCE_ALLOCATED;
> > > > +	}
> > > 
> > > Please keep code refactoring as a separate patch.
> > 
> > It's induced by the change you asked for, it's not a simple refactoring.
> > 
> > Or do you want me to have the patch to check eps against NULL to be separated
> > from this one (see (1) above)?
> 
> 
> The condition "i < dwc->num && dwc->eps[i]" already does the NULL check.
> The change here only move things around.
> 

Ah... my brain is fried. You're right. This change is needed.

Thanks,
Thinh