netdev - Re: [patch V2 03/15] usb: gadget: Use completion interface instead of open coding it

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Date:   Thu, 19 Mar 2020 09:41:15 +0100
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@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>, Will Deacon <will@...nel.org>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Felipe Balbi <balbi@...nel.org>, linux-usb@...r.kernel.org,
        Logan Gunthorpe <logang@...tatee.com>,
        Kurt Schwemmer <kurt.schwemmer@...rosemi.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        Oleg Nesterov <oleg@...hat.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Michael Ellerman <mpe@...erman.id.au>,
        Arnd Bergmann <arnd@...db.de>, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [patch V2 03/15] usb: gadget: Use completion interface instead
 of open coding it

On Wed, Mar 18, 2020 at 09:43:05PM +0100, Thomas Gleixner wrote:
> ep_io() uses a completion on stack and open codes the waiting with:
> 
>   wait_event_interruptible (done.wait, done.done);
> and
>   wait_event (done.wait, done.done);
> 
> This waits in non-exclusive mode for complete(), but there is no reason to
> do so because the completion can only be waited for by the task itself and
> complete() wakes exactly one exlusive waiter.
> 
> Replace the open coded implementation with the corresponding
> wait_for_completion*() functions.
> 
> No functional change.
> 
> Reported-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
> ---
> V2: New patch to avoid the conversion to swait interfaces later
> ---

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