linux-kernel - Re: [patch V2 12/13] usb: core: Replace in

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Date:   Mon, 19 Oct 2020 12:28:40 -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>,
        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, Felipe Balbi <balbi@...nel.org>,
        Duncan Sands <duncan.sands@...e.fr>
Subject: Re: [patch V2 12/13] usb: core: Replace in_interrupt() in comments

On Mon, Oct 19, 2020 at 12:06:41PM +0200, Thomas Gleixner wrote:
> From: Ahmed S. Darwish <a.darwish@...utronix.de>
> 
> The usage of in_interrupt() in drivers is phased out for various reasons.
> 
> Various comments use !in_interrupt() to describe calling context for
> functions which might sleep. That's wrong because the calling context has
> to be preemptible task context, which is not what !in_interrupt()
> describes.
> 
> Replace !in_interrupt() with more accurate plain text descriptions.
> 
> The comment for usb_hcd_poll_rh_status() is misleading as this function is
> called from all kinds of contexts including preemptible task
> context. Remove it as there is obviously no restriction.
> 
> 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: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: linux-usb@...r.kernel.org
> ---
> V2: Fixup the comments according to review (Alan)
> ---
>  drivers/usb/core/buffer.c  |    6 ++++--
>  drivers/usb/core/hcd-pci.c |    6 ++++--
>  drivers/usb/core/hcd.c     |   26 +++++++++++++++++---------
>  drivers/usb/core/hub.c     |    3 ++-
>  drivers/usb/core/message.c |   35 ++++++++++++++++++++++-------------
>  drivers/usb/core/usb.c     |    4 ++--
>  6 files changed, 51 insertions(+), 29 deletions(-)

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