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[02/10] soc: fujtisu: hwb: Add open operation

Message ID 20210108105241.1757799-3-misono.tomohiro@jp.fujitsu.com (mailing list archive)
State Changes Requested
Headers show
Series Add Fujitsu A64FX soc entry/hardware barrier driver | expand

Commit Message

Misono Tomohiro Jan. 8, 2021, 10:52 a.m. UTC 
Nothing special. Just preparing private_data for this FD.

Signed-off-by: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com>
---
 drivers/soc/fujitsu/fujitsu_hwb.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
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Patch

diff --git a/drivers/soc/fujitsu/fujitsu_hwb.c b/drivers/soc/fujitsu/fujitsu_hwb.c
index 44c32c1683df..1dec3d3c652f 100644
--- a/drivers/soc/fujitsu/fujitsu_hwb.c
+++ b/drivers/soc/fujitsu/fujitsu_hwb.c
@@ -142,8 +142,28 @@  struct bb_info {
 };
 static struct kmem_cache *bb_info_cachep;
 
+static int fujitsu_hwb_dev_open(struct inode *inode, struct file *filp)
+{
+	struct hwb_private_data *pdata;
+
+	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return -ENOMEM;
+	INIT_LIST_HEAD(&pdata->bb_list);
+	spin_lock_init(&pdata->list_lock);
+
+	/*
+	 * misc_open() sets pointer of the miscdevice to filp->private_data.
+	 * Just override it since barrier fops does not use it
+	 */
+	filp->private_data = pdata;
+
+	return 0;
+}
+
 static const struct file_operations fujitsu_hwb_dev_fops = {
 	.owner          = THIS_MODULE,
+	.open           = fujitsu_hwb_dev_open,
 };
 
 static struct miscdevice bar_miscdev = {