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> unsigned int cmd, void* arg)
> {
> struct w9968cf_device* cam;
> + void __user *user_arg = (void __user *)arg;
The right place to apply this patch is in video_usercopy().
When video_usercopy() is used in the ioctl() method, there is no need
to dereference the arg pointer in ioctl() itself, since one of the purposes
of video_usercopy() is to do this work for us.
Please have a look at definition of the function in videodev.c.
int
video_usercopy(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg,
int (*func)(struct inode *inode, struct file *file,
unsigned int cmd, unsigned void *arg))
What you have patched in your patch is the function pointed
by "func" above, which should already receive the __user pointer to arg.
Luca
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