[PATCH 02/10] soc: fujtisu: hwb: Add open operation
From: Misono Tomohiro <hidden>
Date: 2021-01-08 10:23:36
Subsystem:
the rest · Maintainer:
Linus Torvalds
Nothing special. Just preparing private_data for this FD. Signed-off-by: Misono Tomohiro <redacted> --- drivers/soc/fujitsu/fujitsu_hwb.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)
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 = {
--
2.26.2
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