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@xxxxxxxxx>
---
drivers/video/pxa3xx-gcu.c | 10 ++++++++++
1 file changed, 10 insertions(+)
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,
--
1.8.5.3
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