[PATCH 08/10] soc: fujitsu: hwb: Add release operation

[Misono Tomohiro <misono.tomohiro@jp.fujitsu.com>]

Upon release, we cleanup remaining resources/registers if necessary.
This happens when user does not call IOC_BB_FREE properly and the
function will do effectively the same operation as IOC_BB_FREE.

Signed-off-by: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com>
---
 drivers/soc/fujitsu/fujitsu_hwb.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/soc/fujitsu/fujitsu_hwb.c b/drivers/soc/fujitsu/fujitsu_hwb.c
index 1132cb74b13b..46f1f244f93a 100644
--- a/drivers/soc/fujitsu/fujitsu_hwb.c
+++ b/drivers/soc/fujitsu/fujitsu_hwb.c
@@ -796,9 +796,35 @@ static int fujitsu_hwb_dev_open(struct inode *inode, struct file *filp)
 	return 0;
 }
 
+static int fujitsu_hwb_dev_release(struct inode *inode, struct file *filp)
+{
+	struct hwb_private_data *pdata = (struct hwb_private_data *)filp->private_data;
+	struct bb_info *bb_info, *tmp;
+
+	/*
+	 * Cleanup BB if IOC_BB_FREE is not called properly.
+	 * No lock for pdata->bb_list is needed cause there is no one else
+	 */
+	if (!list_empty(&pdata->bb_list)) {
+		pr_warn("free operation is not called properly\n");
+
+		list_for_each_entry_safe(bb_info, tmp, &pdata->bb_list, node) {
+			teardown_bb(bb_info);
+			list_del_init(&bb_info->node);
+			/* 1 put for alloc_bb_info */
+			put_bb_info(bb_info);
+		}
+	}
+
+	kfree(pdata);
+
+	return 0;
+}
+
 static const struct file_operations fujitsu_hwb_dev_fops = {
 	.owner          = THIS_MODULE,
 	.open           = fujitsu_hwb_dev_open,
+	.release        = fujitsu_hwb_dev_release,
 	.unlocked_ioctl = fujitsu_hwb_dev_ioctl,
 };
 
-- 
2.26.2