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[3/4] video: pxa3xx-gcu: provide an empty .open call

Message ID 1394035969-32420-4-git-send-email-zonque@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

Daniel Mack March 5, 2014, 4:12 p.m. UTC 
This is necessary in order to make the core set file->private_data to
miscdev in use. We need that information later to dereference the
container of the device, so we can get access to our private struct from
other callbacks.

Signed-off-by: Daniel Mack <zonque@gmail.com>
---
 drivers/video/pxa3xx-gcu.c | 10 ++++++++++
 1 file changed, 10 insertions(+)
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Patch

diff --git a/drivers/video/pxa3xx-gcu.c b/drivers/video/pxa3xx-gcu.c
index f9961ba..73c29ec 100644
--- a/drivers/video/pxa3xx-gcu.c
+++ b/drivers/video/pxa3xx-gcu.c
@@ -373,6 +373,15 @@  static inline struct pxa3xx_gcu_priv *to_pxa3xx_gcu_priv(struct file *file)
 	return container_of(dev, struct pxa3xx_gcu_priv, misc_dev);
 }
 
+/*
+ * provide an empty .open callback, so the core sets file->private_data
+ * for us.
+ */
+static int pxa3xx_gcu_open(struct inode *inode, struct file *file)
+{
+	return 0;
+}
+
 static ssize_t
 pxa3xx_gcu_write(struct file *file, const char *buff,
 		 size_t count, loff_t *offp)
@@ -571,6 +580,7 @@  pxa3xx_gcu_free_buffers(struct device *dev,
 
 static const struct file_operations pxa3xx_gcu_miscdev_fops = {
 	.owner =		THIS_MODULE,
+	.open =			pxa3xx_gcu_open,
 	.write =		pxa3xx_gcu_write,
 	.unlocked_ioctl =	pxa3xx_gcu_ioctl,
 	.mmap =			pxa3xx_gcu_mmap,