linux-kernel - Re: [PATCH] USB: serial: relax unthrottle memory barrier

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Message-ID: <20200130102300.GA927405@kroah.com>
Date:   Thu, 30 Jan 2020 11:23:00 +0100
From:   Greg KH <greg@...ah.com>
To:     Johan Hovold <johan@...nel.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Davidlohr Bueso <dave@...olabs.net>
Subject: Re: [PATCH] USB: serial: relax unthrottle memory barrier

On Thu, Jan 30, 2020 at 11:06:58AM +0100, Johan Hovold wrote:
> Commit a8d78d9f3856 ("USB: serial: clean up throttle handling")
> converted the throttle handling to use atomic bitops. This means that we
> can relax the smp_mb() in unthrottle() to smp_mb__after_atomic(), which
> for example is a no-op on architectures like x86 that provide fully
> ordered atomics.
> 
> Signed-off-by: Johan Hovold <johan@...nel.org>

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