It is possibe that probe failure issue happens when the device
and its child_device's probe happens at the same time.
In coresight_make_links, has_conns_grp is true for parent, but
has_conns_grp is false for child device as has_conns_grp is set
to true in coresight_create_conns_sysfs_group. The probe of parent
device will fail at this condition. Add has_conns_grp check for
child device before make the links and make the process from
device_register to connection_create be atomic to avoid this
probe failure issue.
Suggested-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
Suggested-by: Mike Leach <mike.leach@xxxxxxxxxx>
Signed-off-by: Mao Jinlong <quic_jinlmao@xxxxxxxxxxx>
---
drivers/hwtracing/coresight/coresight-core.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c
index 88653d1c06a4..7ce78dddfe31 100644
--- a/drivers/hwtracing/coresight/coresight-core.c
+++ b/drivers/hwtracing/coresight/coresight-core.c
@@ -1382,7 +1382,7 @@ static int coresight_fixup_device_conns(struct coresight_device *csdev)
continue;
conn->child_dev =
coresight_find_csdev_by_fwnode(conn->child_fwnode);
- if (conn->child_dev) {
+ if (conn->child_dev && conn->child_dev->has_conns_grp) {
ret = coresight_make_links(csdev, conn,
conn->child_dev);
if (ret)
@@ -1619,6 +1619,7 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
csdev->dev.fwnode = fwnode_handle_get(dev_fwnode(desc->dev));
dev_set_name(&csdev->dev, "%s", desc->name);
+ mutex_lock(&coresight_mutex);
ret = device_register(&csdev->dev);
if (ret) {
put_device(&csdev->dev);
@@ -1645,8 +1646,6 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
}
}
- mutex_lock(&coresight_mutex);
-
ret = coresight_create_conns_sysfs_group(csdev);
if (!ret)
ret = coresight_fixup_device_conns(csdev);
@@ -1666,6 +1665,7 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
err_free_csdev:
kfree(csdev);
err_out:
+ mutex_unlock(&coresight_mutex);
/* Cleanup the connection information */
coresight_release_platform_data(NULL, desc->pdata);
return ERR_PTR(ret);
--
2.17.1
