linux-kernel - [PATCH v1 2/4] coresight: add and remove panic callback for sink

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Date:   Sat,  3 Jun 2017 22:42:54 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        Will Deacon <will.deacon@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Mike Leach <mike.leach@...aro.org>,
        Chunyan Zhang <zhang.chunyan@...aro.org>
Cc:     Leo Yan <leo.yan@...aro.org>
Subject: [PATCH v1 2/4] coresight: add and remove panic callback for sink

If the sink device has panic callback function, add the panic callback
node for coresight panic dump list when the sink device is enabled;
also cleanup the node when the sink device is disabled.

Signed-off-by: Leo Yan <leo.yan@...aro.org>
---
 drivers/hwtracing/coresight/coresight.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
index 0c37356..5928886 100644
--- a/drivers/hwtracing/coresight/coresight.c
+++ b/drivers/hwtracing/coresight/coresight.c
@@ -138,6 +138,13 @@ static int coresight_enable_sink(struct coresight_device *csdev, u32 mode)
 			if (ret)
 				return ret;
 		}
+
+		/* Add kernel panic callback */
+		if (sink_ops(csdev)->panic_cb) {
+			ret = coresight_add_panic_cb(csdev);
+			if (ret)
+				return ret;
+		}
 		csdev->enable = true;
 	}
 
@@ -149,6 +156,10 @@ static int coresight_enable_sink(struct coresight_device *csdev, u32 mode)
 static void coresight_disable_sink(struct coresight_device *csdev)
 {
 	if (atomic_dec_return(csdev->refcnt) == 0) {
+		/* Remove kernel panic callback */
+		if (sink_ops(csdev)->panic_cb)
+			coresight_del_panic_cb(csdev);
+
 		if (sink_ops(csdev)->disable) {
 			sink_ops(csdev)->disable(csdev);
 			csdev->enable = false;
-- 
2.7.4