linux-kernel - RE: [PATCHv6 8/8] usb: dwc2: move usb_disabled() call to host driver only

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Message-ID: <A2CA0424C0A6F04399FB9E1CD98E0304844E6ACC@US01WEMBX2.internal.synopsys.com>
Date:	Wed, 29 Oct 2014 01:26:27 +0000
From:	Paul Zimmerman <Paul.Zimmerman@...opsys.com>
To:	"dinguyen@...nsource.altera.com" <dinguyen@...nsource.altera.com>,
	"balbi@...com" <balbi@...com>
CC:	"dinh.linux@...il.com" <dinh.linux@...il.com>,
	"swarren@...dotorg.org" <swarren@...dotorg.org>,
	"b.zolnierkie@...sung.com" <b.zolnierkie@...sung.com>,
	"matthijs@...in.nl" <matthijs@...in.nl>,
	"r.baldyga@...sung.com" <r.baldyga@...sung.com>,
	"jg1.han@...sung.com" <jg1.han@...sung.com>,
	"sachin.kamat@...aro.org" <sachin.kamat@...aro.org>,
	"ben-linux@...ff.org" <ben-linux@...ff.org>,
	"dianders@...omium.org" <dianders@...omium.org>,
	"kever.yang@...k-chips.com" <kever.yang@...k-chips.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCHv6 8/8] usb: dwc2: move usb_disabled() call to host
 driver only

> From: dinguyen@...nsource.altera.com [mailto:dinguyen@...nsource.altera.com]
> Sent: Tuesday, October 28, 2014 4:26 PM
> 
> Now that platform.c will get built for both Host and Gadget, if we leave the
> usb_disabled() call in platform.c, it results in the following build error
> when (!USB && USB_GADGET) condition is met.
> 
> ERROR: "usb_disabled" [drivers/usb/dwc2/dwc2_platform.ko] undefined!
> 
> Since usb_disabled() is mostly used to disable USB host functionality, move
> the call the host portion for the DWC2 driver.
> 
> Signed-off-by: Dinh Nguyen <dinguyen@...nsource.altera.com>
> ---
>  drivers/usb/dwc2/hcd.c      | 3 +++
>  drivers/usb/dwc2/platform.c | 3 ---
>  2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
> index fa49c72..b741997 100644
> --- a/drivers/usb/dwc2/hcd.c
> +++ b/drivers/usb/dwc2/hcd.c
> @@ -2780,6 +2780,9 @@ int dwc2_hcd_init(struct dwc2_hsotg *hsotg, int irq,
>  	int i, num_channels;
>  	int retval;
> 
> +	if (usb_disabled())
> +		return -ENODEV;
> +
>  	dev_dbg(hsotg->dev, "DWC OTG HCD INIT\n");
> 
>  	/* Detect config values from hardware */
> diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
> index 77c8417..123cf54 100644
> --- a/drivers/usb/dwc2/platform.c
> +++ b/drivers/usb/dwc2/platform.c
> @@ -157,9 +157,6 @@ static int dwc2_driver_probe(struct platform_device *dev)
>  	int retval;
>  	int irq;
> 
> -	if (usb_disabled())
> -		return -ENODEV;
> -
>  	match = of_match_device(dwc2_of_match_table, &dev->dev);
>  	if (match && match->data) {
>  		params = match->data;

I'm confused. You are saying the build is broken until patch 8/8 is
applied? As always, that is not acceptable. You need to fix the
breakage at the point where it was introduced, not leave it broken
until the last patch in the series.

-- 
Paul

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