linux-kernel - Re: [patch V2 21/36] net: usb: kaweth: Replace kaweth_control() with usb_control

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Message-ID: <20200930062258.GA1471881@kroah.com>
Date:   Wed, 30 Sep 2020 08:22:58 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Paul McKenney <paulmck@...nel.org>,
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        Govindarajulu Varadarajan <_govind@....com>,
        Dave Miller <davem@...emloft.net>,
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        Jonathan Corbet <corbet@....net>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        linux-doc@...r.kernel.org,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
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Subject: Re: [patch V2 21/36] net: usb: kaweth: Replace kaweth_control() with
 usb_control_msg()

On Tue, Sep 29, 2020 at 10:25:30PM +0200, Thomas Gleixner wrote:
> From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> 
> kaweth_control() is almost the same as usb_control_msg() except for the
> memory allocation mode (GFP_ATOMIC vs GFP_NOIO) and the in_interrupt()
> check.
> 
> All the invocations of kaweth_control() are within the probe function in
> fully preemtible context so there is no reason to use atomic allocations,
> GFP_NOIO which is used by usb_control_msg() is perfectly fine.
> 
> Replace kaweth_control() invocations from probe with usb_control_msg().
> 
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

Note, the usb_control_msg_send/recv() new functions that will show up in
5.10-rc1 will help a bit with this logic, but for what you have now,
this is fine, nice cleanups.

Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>