[PATCH v4 08/13] coresight: Simplify connection fixup mechanism

From: James Clark
Date: Tue Apr 04 2023 - 09:56:47 EST


There is some duplication between coresight_fixup_device_conns() and
coresight_fixup_orphan_conns(). They both do the same thing except for
the fact that coresight_fixup_orphan_conns() can't handle iterating over
itself.

By making it able to handle fixing up it's own connections the other
function can be removed.

Signed-off-by: James Clark <james.clark@xxxxxxx>
---
drivers/hwtracing/coresight/coresight-core.c | 84 ++++++++------------
1 file changed, 32 insertions(+), 52 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c
index 0b738960973b..8d377a59e0be 100644
--- a/drivers/hwtracing/coresight/coresight-core.c
+++ b/drivers/hwtracing/coresight/coresight-core.c
@@ -1316,42 +1316,46 @@ static int coresight_orphan_match(struct device *dev, void *data)
{
int i, ret = 0;
bool still_orphan = false;
- struct coresight_device *csdev, *i_csdev;
+ struct coresight_device *dst_csdev = data;
+ struct coresight_device *src_csdev = to_coresight_device(dev);
struct coresight_connection *conn;
-
- csdev = data;
- i_csdev = to_coresight_device(dev);
-
- /* No need to check oneself */
- if (csdev == i_csdev)
- return 0;
+ bool fixup_self = (src_csdev == dst_csdev);

/* Move on to another component if no connection is orphan */
- if (!i_csdev->orphan)
+ if (!src_csdev->orphan)
return 0;
/*
- * Circle throuch all the connection of that component. If we find
- * an orphan connection whose name matches @csdev, link it.
+ * Circle through all the connections of that component. If we find
+ * an orphan connection whose name matches @dst_csdev, link it.
*/
- for (i = 0; i < i_csdev->pdata->nr_outconns; i++) {
- conn = i_csdev->pdata->out_conns[i];
-
- /* We have found at least one orphan connection */
- if (conn->dest_dev == NULL) {
- /* Does it match this newly added device? */
- if (conn->dest_fwnode == csdev->dev.fwnode) {
- ret = coresight_make_links(i_csdev,
- conn, csdev);
- if (ret)
- return ret;
- } else {
- /* This component still has an orphan */
- still_orphan = true;
- }
+ for (i = 0; i < src_csdev->pdata->nr_outconns; i++) {
+ conn = src_csdev->pdata->out_conns[i];
+
+ /* Skip the port if it's already connected. */
+ if (conn->dest_dev)
+ continue;
+
+ /*
+ * If we are at the "new" device, which triggered this search,
+ * we must find the remote device from the fwnode in the
+ * connection.
+ */
+ if (fixup_self)
+ dst_csdev = coresight_find_csdev_by_fwnode(
+ conn->dest_fwnode);
+
+ /* Does it match this newly added device? */
+ if (dst_csdev && conn->dest_fwnode == dst_csdev->dev.fwnode) {
+ ret = coresight_make_links(src_csdev, conn, dst_csdev);
+ if (ret)
+ return ret;
+ } else {
+ /* This component still has an orphan */
+ still_orphan = true;
}
}

- i_csdev->orphan = still_orphan;
+ src_csdev->orphan = still_orphan;

/*
* Returning '0' in case we didn't encounter any error,
@@ -1366,28 +1370,6 @@ static int coresight_fixup_orphan_conns(struct coresight_device *csdev)
csdev, coresight_orphan_match);
}

-
-static int coresight_fixup_device_conns(struct coresight_device *csdev)
-{
- int i, ret = 0;
-
- for (i = 0; i < csdev->pdata->nr_outconns; i++) {
- struct coresight_connection *conn = csdev->pdata->out_conns[i];
-
- conn->dest_dev =
- coresight_find_csdev_by_fwnode(conn->dest_fwnode);
- if (conn->dest_dev && conn->dest_dev->has_conns_grp) {
- ret = coresight_make_links(csdev, conn, conn->dest_dev);
- if (ret)
- break;
- } else {
- csdev->orphan = true;
- }
- }
-
- return ret;
-}
-
static int coresight_remove_match(struct device *dev, void *data)
{
int i;
@@ -1595,7 +1577,7 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
csdev->subtype = desc->subtype;
csdev->ops = desc->ops;
csdev->access = desc->access;
- csdev->orphan = false;
+ csdev->orphan = true;

csdev->dev.type = &coresight_dev_type[desc->type];
csdev->dev.groups = desc->groups;
@@ -1645,8 +1627,6 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
registered = true;

ret = coresight_create_conns_sysfs_group(csdev);
- if (!ret)
- ret = coresight_fixup_device_conns(csdev);
if (!ret)
ret = coresight_fixup_orphan_conns(csdev);

--
2.34.1