[PATCH 08/10] v4l: always use unlocked_ioctl

John Kacur
2010-04-27T09:19:05Z

From: Arnd Bergmann <arnd@arndb.de>

v4l drivers may still use a locked ioctl method,
but we now always export an unlocked_ioctl and
lock ourselves, so that the ->ioctl file operation
can get removed.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Fixed merge conflicts that result from having applied
Linus's Preparation for BKL'ed ioctl removal patch first.

Signed-off-by: John Kacur <jkacur@redhat.com>
---
drivers/media/video/v4l2-dev.c | 17 ++++++++++++++---
1 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/media/video/v4l2-dev.c b/drivers/media/video/v4l2-dev.c
index c48143a..3606694 100644
--- a/drivers/media/video/v4l2-dev.c
+++ b/drivers/media/video/v4l2-dev.c
@@ -22,6 +22,7 @@
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/errno.h>
+#include <linux/smp_lock.h>
#include <linux/init.h>
#include <linux/kmod.h>
#include <linux/slab.h>
@@ -215,16 +216,21 @@ static unsigned int v4l2_poll(struct file *filp, struct poll_table_struct *poll)
return vdev->fops->poll(filp, poll);
}

-static int v4l2_ioctl(struct inode *inode, struct file *filp,
+static long v4l2_ioctl(struct file *filp,
unsigned int cmd, unsigned long arg)
{
struct video_device *vdev = video_devdata(filp);
+ int ret;

if (!vdev->fops->ioctl)
return -ENOTTY;
/* Allow ioctl to continue even if the device was unregistered.
Things like dequeueing buffers might still be useful. */
- return vdev->fops->ioctl(filp, cmd, arg);
+ lock_kernel();
+ ret = vdev->fops->ioctl(filp->f_path.dentry->d_inode, filp, cmd, arg);
+ unlock_kernel();
+
+ return ret;
}

static long v4l2_unlocked_ioctl(struct file *filp,
@@ -323,6 +329,11 @@ static const struct file_operations v4l2_unlocked_fops = {
.llseek = no_llseek,
};

+/*
+ * Note: this should not be needed, just check
+ * both pointers in v4l2_ioctl, or kill
+ * fops->ioctl. -arnd
+ */
static const struct file_operations v4l2_fops = {
.owner = THIS_MODULE,
.read = v4l2_read,
@@ -330,7 +341,7 @@ static const struct file_operations v4l2_fops = {
.open = v4l2_open,
.get_unmapped_area = v4l2_get_unmapped_area,
.mmap = v4l2_mmap,
- .bkl_ioctl = v4l2_ioctl,
+ .unlocked_ioctl = v4l2_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = v4l2_compat_ioctl32,
#endif
--
1.6.6.1