linux-kernel - Re: [patch V2 11/13] usb: gadget: udc: Remove in_interrupt()/in

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Date:   Mon, 19 Oct 2020 12:28:35 -0400
From:   Alan Stern <stern@...land.harvard.edu>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "Ahmed S. Darwish" <a.darwish@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org,
        Thomas Winischhofer <thomas@...ischhofer.net>,
        Johan Hovold <johan@...nel.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Valentina Manea <valentina.manea.m@...il.com>,
        Shuah Khan <shuah@...nel.org>, linux-omap@...r.kernel.org,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org,
        Duncan Sands <duncan.sands@...e.fr>
Subject: Re: [patch V2 11/13] usb: gadget: udc: Remove
 in_interrupt()/in_irq() from comments

On Mon, Oct 19, 2020 at 12:06:40PM +0200, Thomas Gleixner wrote:
> From: Ahmed S. Darwish <a.darwish@...utronix.de>
> 
> The usage of in_irq()/in_interrupt() in drivers is phased out for various
> reasons.
> 
> The context description for usb_gadget_giveback_request() is misleading as
> in_interupt() means: hard interrupt or soft interrupt or bottom half
> disabled regions. But it's also invoked from task context when endpoints
> are torn down. Remove it as it's more confusing than helpful.
> 
> Replace also the in_irq() comment with plain text.
> 
> Signed-off-by: Ahmed S. Darwish <a.darwish@...utronix.de>
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: Felipe Balbi <balbi@...nel.org>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: linux-usb@...r.kernel.org
> 
> ---
>  drivers/usb/gadget/udc/core.c      |    2 --
>  drivers/usb/gadget/udc/dummy_hcd.c |    6 ++++--
>  2 files changed, 4 insertions(+), 4 deletions(-)
> 
> --- a/drivers/usb/gadget/udc/core.c
> +++ b/drivers/usb/gadget/udc/core.c
> @@ -894,8 +894,6 @@ EXPORT_SYMBOL_GPL(usb_gadget_unmap_reque
>   * @ep: the endpoint to be used with with the request
>   * @req: the request being given back
>   *
> - * Context: in_interrupt()
> - *
>   * This is called by device controller drivers in order to return the
>   * completed request back to the gadget layer.
>   */
> --- a/drivers/usb/gadget/udc/dummy_hcd.c
> +++ b/drivers/usb/gadget/udc/dummy_hcd.c
> @@ -1754,8 +1754,10 @@ static int handle_control_request(struct
>  	return ret_val;
>  }
>  
> -/* drive both sides of the transfers; looks like irq handlers to
> - * both drivers except the callbacks aren't in_irq().
> +/*
> + * Drive both sides of the transfers; looks like irq handlers to both
> + * drivers except that the callbacks are invoked from soft interrupt
> + * context.
>   */
>  static void dummy_timer(struct timer_list *t)
>  {

For dummy-hcd.c:

Acked-by: Alan Stern <stern@...land.harvard.edu>