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coresight: core: Fix coresight device probe failure issue
commit 8c1d3f79d9
upstream.
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.
Cc: stable@vger.kernel.org
Suggested-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Suggested-by: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Mao Jinlong <quic_jinlmao@quicinc.com>
Link: https://lore.kernel.org/r/20220309142206.15632-1-quic_jinlmao@quicinc.com
[ Added Cc stable ]
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
5b0ff3ebbe
commit
e5fdef9e84
1 changed files with 22 additions and 11 deletions
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@ -1379,7 +1379,7 @@ static int coresight_fixup_device_conns(struct coresight_device *csdev)
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continue;
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conn->child_dev =
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coresight_find_csdev_by_fwnode(conn->child_fwnode);
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if (conn->child_dev) {
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if (conn->child_dev && conn->child_dev->has_conns_grp) {
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ret = coresight_make_links(csdev, conn,
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conn->child_dev);
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if (ret)
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@ -1571,6 +1571,7 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
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int nr_refcnts = 1;
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atomic_t *refcnts = NULL;
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struct coresight_device *csdev;
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bool registered = false;
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csdev = kzalloc(sizeof(*csdev), GFP_KERNEL);
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if (!csdev) {
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@ -1591,7 +1592,8 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
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refcnts = kcalloc(nr_refcnts, sizeof(*refcnts), GFP_KERNEL);
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if (!refcnts) {
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ret = -ENOMEM;
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goto err_free_csdev;
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kfree(csdev);
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goto err_out;
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}
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csdev->refcnt = refcnts;
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@ -1616,6 +1618,13 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
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csdev->dev.fwnode = fwnode_handle_get(dev_fwnode(desc->dev));
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dev_set_name(&csdev->dev, "%s", desc->name);
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/*
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* Make sure the device registration and the connection fixup
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* are synchronised, so that we don't see uninitialised devices
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* on the coresight bus while trying to resolve the connections.
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*/
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mutex_lock(&coresight_mutex);
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ret = device_register(&csdev->dev);
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if (ret) {
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put_device(&csdev->dev);
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@ -1623,7 +1632,7 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
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* All resources are free'd explicitly via
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* coresight_device_release(), triggered from put_device().
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*/
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goto err_out;
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goto out_unlock;
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}
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if (csdev->type == CORESIGHT_DEV_TYPE_SINK ||
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@ -1638,11 +1647,11 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
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* from put_device(), which is in turn called from
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* function device_unregister().
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*/
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goto err_out;
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goto out_unlock;
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}
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}
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mutex_lock(&coresight_mutex);
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/* Device is now registered */
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registered = true;
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ret = coresight_create_conns_sysfs_group(csdev);
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if (!ret)
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@ -1652,16 +1661,18 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
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if (!ret && cti_assoc_ops && cti_assoc_ops->add)
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cti_assoc_ops->add(csdev);
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out_unlock:
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mutex_unlock(&coresight_mutex);
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if (ret) {
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/* Success */
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if (!ret)
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return csdev;
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/* Unregister the device if needed */
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if (registered) {
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coresight_unregister(csdev);
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return ERR_PTR(ret);
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}
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return csdev;
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err_free_csdev:
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kfree(csdev);
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err_out:
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/* Cleanup the connection information */
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coresight_release_platform_data(NULL, desc->pdata);
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