linux-kernel - Re: [PATCH] bluetooth: Remove unnecessary smp_mb__after

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Message-Id: <E1EF7686-BED9-4E96-988E-8B22B2646D78@holtmann.org>
Date:   Wed, 19 Dec 2018 00:49:53 +0100
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Andrea Parri <andrea.parri@...rulasolutions.com>
Cc:     Johan Hedberg <johan.hedberg@...il.com>,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bluetooth: Remove unnecessary smp_mb__after_atomic()
 barriers

Hi Andrea,

> The barriers are redundant because atomic_test_and_clear_bit() already
> provides the required full ordering for the cases in question (that is,
> when the bit is cleared).
> 
> Signed-off-by: Andrea Parri <andrea.parri@...rulasolutions.com>
> ---
> drivers/bluetooth/btusb.c     |  8 ++------
> drivers/bluetooth/hci_intel.c | 16 ++++------------
> 2 files changed, 6 insertions(+), 18 deletions(-)

patch has been applied to bluetooth-next tree.

Regards

Marcel