dmaengine: idxd: fix engine conf_dev lifetime

Remove devm_* allocation and fix engine->conf_dev 'struct device'
lifetime. Address issues flagged by CONFIG_DEBUG_KOBJECT_RELEASE.
Add release functions in order to free the allocated memory at the
engine conf_dev destruction time.

Reported-by: Jason Gunthorpe <jgg@nvidia.com>
Fixes: bfe1d56091c1 ("dmaengine: idxd: Init and probe for Intel data accelerators")
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/161852986460.2203940.16603218225412118431.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

1 files changed, 36 insertions, 36 deletions

diff --git a/drivers/dma/idxd/sysfs.c b/drivers/dma/idxd/sysfs.c
index 409b3ce52f07..ab02e3b4d75d 100644
--- a/drivers/dma/idxd/sysfs.c
+++ b/drivers/dma/idxd/sysfs.c
@@ -26,11 +26,6 @@ static struct device_type idxd_group_device_type = {
 	.release = idxd_conf_sub_device_release,
 };
 
-static struct device_type idxd_engine_device_type = {
-	.name = "engine",
-	.release = idxd_conf_sub_device_release,
-};
-
 static int idxd_config_bus_match(struct device *dev,
 				 struct device_driver *drv)
 {
@@ -464,6 +459,19 @@ static const struct attribute_group *idxd_engine_attribute_groups[] = {
 	NULL,
 };
 
+static void idxd_conf_engine_release(struct device *dev)
+{
+	struct idxd_engine *engine = container_of(dev, struct idxd_engine, conf_dev);
+
+	kfree(engine);
+}
+
+struct device_type idxd_engine_device_type = {
+	.name = "engine",
+	.release = idxd_conf_engine_release,
+	.groups = idxd_engine_attribute_groups,
+};
+
 /* Group attributes */
 
 static void idxd_set_free_tokens(struct idxd_device *idxd)
@@ -626,7 +634,7 @@ static ssize_t group_engines_show(struct device *dev,
 	struct idxd_device *idxd = group->idxd;
 
 	for (i = 0; i < idxd->max_engines; i++) {
-		struct idxd_engine *engine = &idxd->engines[i];
+		struct idxd_engine *engine = idxd->engines[i];
 
 		if (!engine->group)
 			continue;
@@ -1634,37 +1642,27 @@ struct device_type iax_device_type = {
 	.groups = idxd_attribute_groups,
 };
 
-static int idxd_setup_engine_sysfs(struct idxd_device *idxd)
+static int idxd_register_engine_devices(struct idxd_device *idxd)
 {
-	struct device *dev = &idxd->pdev->dev;
-	int i, rc;
+	int i, j, rc;
 
 	for (i = 0; i < idxd->max_engines; i++) {
-		struct idxd_engine *engine = &idxd->engines[i];
-
-		engine->conf_dev.parent = &idxd->conf_dev;
-		dev_set_name(&engine->conf_dev, "engine%d.%d",
-			     idxd->id, engine->id);
-		engine->conf_dev.bus = idxd_get_bus_type(idxd);
-		engine->conf_dev.groups = idxd_engine_attribute_groups;
-		engine->conf_dev.type = &idxd_engine_device_type;
-		dev_dbg(dev, "Engine device register: %s\n",
-			dev_name(&engine->conf_dev));
-		rc = device_register(&engine->conf_dev);
-		if (rc < 0) {
-			put_device(&engine->conf_dev);
+		struct idxd_engine *engine = idxd->engines[i];
+
+		rc = device_add(&engine->conf_dev);
+		if (rc < 0)
 			goto cleanup;
-		}
 	}
 
 	return 0;
 
 cleanup:
-	while (i--) {
-		struct idxd_engine *engine = &idxd->engines[i];
+	j = i - 1;
+	for (; i < idxd->max_engines; i++)
+		put_device(&idxd->engines[i]->conf_dev);
 
-		device_unregister(&engine->conf_dev);
-	}
+	while (j--)
+		device_unregister(&idxd->engines[j]->conf_dev);
 	return rc;
 }
 
@@ -1741,23 +1739,25 @@ int idxd_register_devices(struct idxd_device *idxd)
 		goto err_wq;
 	}
 
-	rc = idxd_setup_group_sysfs(idxd);
+	rc = idxd_register_engine_devices(idxd);
 	if (rc < 0) {
-		/* unregister conf dev */
-		dev_dbg(dev, "Group sysfs registering failed: %d\n", rc);
-		goto err;
+		dev_dbg(dev, "Engine devices registering failed: %d\n", rc);
+		goto err_engine;
 	}
 
-	rc = idxd_setup_engine_sysfs(idxd);
+	rc = idxd_setup_group_sysfs(idxd);
 	if (rc < 0) {
 		/* unregister conf dev */
-		dev_dbg(dev, "Engine sysfs registering failed: %d\n", rc);
-		goto err;
+		dev_dbg(dev, "Group sysfs registering failed: %d\n", rc);
+		goto err_group;
 	}
 
 	return 0;
 
- err:
+ err_group:
+	for (i = 0; i < idxd->max_engines; i++)
+		device_unregister(&idxd->engines[i]->conf_dev);
+ err_engine:
 	for (i = 0; i < idxd->max_wqs; i++)
 		device_unregister(&idxd->wqs[i]->conf_dev);
  err_wq:
@@ -1776,7 +1776,7 @@ void idxd_unregister_devices(struct idxd_device *idxd)
 	}
 
 	for (i = 0; i < idxd->max_engines; i++) {
-		struct idxd_engine *engine = &idxd->engines[i];
+		struct idxd_engine *engine = idxd->engines[i];
 
 		device_unregister(&engine->conf_dev);
 	}