netdev - Re: [patch 21/35] net: usb: kaweth: Remove last user of kaweth

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Date:   Mon, 28 Sep 2020 08:50:11 +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>,
        Linus Torvalds <torvalds@...uxfoundation.org>,
        Paul McKenney <paulmck@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-usb@...r.kernel.org,
        netdev@...r.kernel.org, Christian Benvenuti <benve@...co.com>,
        Govindarajulu Varadarajan <_govind@....com>,
        Jonathan Corbet <corbet@....net>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        linux-doc@...r.kernel.org,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Jay Cliburn <jcliburn@...il.com>,
        Chris Snook <chris.snook@...il.com>,
        Vishal Kulkarni <vishal@...lsio.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        intel-wired-lan@...ts.osuosl.org,
        Shannon Nelson <snelson@...sando.io>,
        Pensando Drivers <drivers@...sando.io>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Solarflare linux maintainers <linux-net-drivers@...arflare.com>,
        Edward Cree <ecree@...arflare.com>,
        Martin Habets <mhabets@...arflare.com>,
        Jon Mason <jdmason@...zu.us>, Daniel Drake <dsd@...too.org>,
        Ulrich Kunitz <kune@...ne-taler.de>,
        Kalle Valo <kvalo@...eaurora.org>,
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        Franky Lin <franky.lin@...adcom.com>,
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        Chi-Hsien Lin <chi-hsien.lin@...ress.com>,
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        Stanislav Yakovlev <stas.yakovlev@...il.com>,
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        Xinming Hu <huxinming820@...il.com>,
        libertas-dev@...ts.infradead.org,
        Pascal Terjan <pterjan@...gle.com>,
        Ping-Ke Shih <pkshih@...ltek.com>
Subject: Re: [patch 21/35] net: usb: kaweth: Remove last user of
 kaweth_control()

On Sun, Sep 27, 2020 at 09:49:07PM +0200, Thomas Gleixner wrote:
> From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> 
> kaweth_async_set_rx_mode() invokes kaweth_contol() and has two callers:
> 
> - kaweth_open() which is invoked from preemptible context
> .
> - kaweth_start_xmit() which holds a spinlock and has bottom halfs disabled.
> 
> If called from kaweth_start_xmit() kaweth_async_set_rx_mode() obviously
> cannot block, which means it can't call kaweth_control(). This is detected
> with an in_interrupt() check.
> 
> Replace the in_interrupt() check in kaweth_async_set_rx_mode() with an
> argument which is set true by the caller if the context is safe to sleep,
> otherwise false.
> 
> Now kaweth_control() is only called from preemptible context which means
> there is no need for GFP_ATOMIC allocations anymore. Replace it with
> usb_control_msg(). Cleanup the code a bit while at it.
> 
> Finally remove kaweth_control() since the last user is gone.
> 
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Jakub Kicinski <kuba@...nel.org>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: linux-usb@...r.kernel.org
> Cc: netdev@...r.kernel.org

Thanks for the cleanup, that driver really needed it!

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