linux-kernel - Re: [PATCH v2] usb: dwc2: Register interrupt handler only once gadget is correctly initialized

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Date:	Thu, 12 Feb 2015 13:42:44 +0100
From:	Romain Perier <romain.perier@...il.com>
To:	johnyoun@...opsys.com
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>
Subject: Re: [PATCH v2] usb: dwc2: Register interrupt handler only once gadget
 is correctly initialized

ping

2015-02-06 17:50 GMT+01:00 Romain Perier <romain.perier@...il.com>:
> Don't register interrupt handler before usb gadget is correctly initialized.
> For some embedded platforms which don't have a usb-phy, it crashes the driver
> because an interrupt is emitted with non-initialized hardware.
> According to devm_request_irq documentation, an interrupt can be emitted
> at any time once the interrupt is registered, so we have to care about driver
> and hardware initialization.
>
> Signed-off-by: Romain Perier <romain.perier@...il.com>
> ---
>
> Changes for v2: fix typos in commit log
>
>  drivers/usb/dwc2/platform.c | 17 +++++++++--------
>  1 file changed, 9 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
> index ae095f0..b26cf8c 100644
> --- a/drivers/usb/dwc2/platform.c
> +++ b/drivers/usb/dwc2/platform.c
> @@ -196,14 +196,6 @@ static int dwc2_driver_probe(struct platform_device *dev)
>                 return irq;
>         }
>
> -       dev_dbg(hsotg->dev, "registering common handler for irq%d\n",
> -               irq);
> -       retval = devm_request_irq(hsotg->dev, irq,
> -                                 dwc2_handle_common_intr, IRQF_SHARED,
> -                                 dev_name(hsotg->dev), hsotg);
> -       if (retval)
> -               return retval;
> -
>         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
>         hsotg->regs = devm_ioremap_resource(&dev->dev, res);
>         if (IS_ERR(hsotg->regs))
> @@ -237,6 +229,15 @@ static int dwc2_driver_probe(struct platform_device *dev)
>         retval = dwc2_gadget_init(hsotg, irq);
>         if (retval)
>                 return retval;
> +
> +        dev_dbg(hsotg->dev, "registering common handler for irq%d\n",
> +                irq);
> +        retval = devm_request_irq(hsotg->dev, irq,
> +                                dwc2_handle_common_intr, IRQF_SHARED,
> +                                dev_name(hsotg->dev), hsotg);
> +        if (retval)
> +                return retval;
> +
>         retval = dwc2_hcd_init(hsotg, irq, params);
>         if (retval)
>                 return retval;
> --
> 1.9.1
>
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