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Date:   Fri,  9 Aug 2019 14:58:48 -0700
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Subject: Re: [PATCH] coresight: Serialize enabling/disabling a link device.
From:   Yabin Cui <yabinc@google.com>
To:     Mathieu Poirier <mathieu.poirier@linaro.org>,
        Suzuki K Poulose <suzuki.poulose@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc:     linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Yabin Cui <yabinc@google.com>
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>You may also want to protect the refcount checks below with the same lock, just
>to be consistent.

Good suggestion! I didn't protect it because I found other places using refcnt.
But it turns out they are not link devices.
I have uploaded patch v2.