Re: [PATCH] USB: serial: relax unthrottle memory barrier

[Greg KH]

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@xxxxxxxxxx>

Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>