From d2998dc1f9b14d19f886d8f75ca47c5806635902 Mon Sep 17 00:00:00 2001 From: Suzuki K Poulose Date: Wed, 19 Jun 2019 13:52:58 -0600 Subject: coresight: Cleanup coresight_remove_conns When a device is unregistered, we remove all connection references to it, by searching the connection records of all devices in the coresight bus, via coresight_remove_conns. We could avoid searching if this device doesn't have an input port (e.g, a source). Also document the purpose of the function. Signed-off-by: Suzuki K Poulose Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman --- drivers/hwtracing/coresight/coresight.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c index 04b5d3c2bb3a..068bd2fc0985 100644 --- a/drivers/hwtracing/coresight/coresight.c +++ b/drivers/hwtracing/coresight/coresight.c @@ -1096,10 +1096,21 @@ static int coresight_remove_match(struct device *dev, void *data) return 0; } +/* + * coresight_remove_conns - Remove references to this given devices + * from the connections of other devices. + */ static void coresight_remove_conns(struct coresight_device *csdev) { - bus_for_each_dev(&coresight_bustype, NULL, - csdev, coresight_remove_match); + /* + * Another device will point to this device only if there is + * an output port connected to this one. i.e, if the device + * doesn't have at least one input port, there is no point + * in searching all the devices. + */ + if (csdev->nr_inport) + bus_for_each_dev(&coresight_bustype, NULL, + csdev, coresight_remove_match); } /** -- cgit v1.2.3