[PATCH v4 1/4] vduse: store control device pointer

["Eugenio Pérez" <eperezma@redhat.com>]

This helps log the errors in next patches.  The alternative is to
perform a linear search for it with class_find_device_by_devt(class, devt),
as device_destroy do for cleaning.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
v4: Set control device pointer to NULL at device create error.
---
 drivers/vdpa/vdpa_user/vduse_dev.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
index f15ad425e01f..2af5cb5e1ec6 100644
--- a/drivers/vdpa/vdpa_user/vduse_dev.c
+++ b/drivers/vdpa/vdpa_user/vduse_dev.c
@@ -164,6 +164,7 @@ static DEFINE_IDR(vduse_idr);
 
 static dev_t vduse_major;
 static struct cdev vduse_ctrl_cdev;
+static const struct device *vduse_ctrl_dev;
 static struct cdev vduse_cdev;
 static struct workqueue_struct *vduse_irq_wq;
 static struct workqueue_struct *vduse_irq_bound_wq;
@@ -2532,7 +2533,6 @@ static void vduse_mgmtdev_exit(void)
 static int vduse_init(void)
 {
 	int ret;
-	struct device *dev;
 
 	ret = class_register(&vduse_class);
 	if (ret)
@@ -2549,9 +2549,10 @@ static int vduse_init(void)
 	if (ret)
 		goto err_ctrl_cdev;
 
-	dev = device_create(&vduse_class, NULL, vduse_major, NULL, "control");
-	if (IS_ERR(dev)) {
-		ret = PTR_ERR(dev);
+	vduse_ctrl_dev = device_create(&vduse_class, NULL, vduse_major, NULL, "control");
+	if (IS_ERR(vduse_ctrl_dev)) {
+		ret = PTR_ERR(vduse_ctrl_dev);
+		vduse_ctrl_dev = NULL;
 		goto err_device;
 	}
 
-- 
2.55.0