media: media/saa7146: Convert timers to use timer_setup()

In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
to pass the timer pointer explicitly. This requires adding a pointer to
hold the timer's target file, as there won't be a way to pass this in the
future.
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/common/saa7146/saa7146_fops.c

@@ -559,7 +559,7 @@ int saa7146_vv_init(struct saa7146_dev* dev, struct saa7146_ext_vv *ext_vv)
 	vbi->start[1] = 312;
 	vbi->count[1] = 16;
 
-	init_timer(&vv->vbi_read_timeout);
+	timer_setup(&vv->vbi_read_timeout, NULL, 0);
 
 	vv->ov_fb.capability = V4L2_FBUF_CAP_LIST_CLIPPING;
 	vv->ov_fb.flags = V4L2_FBUF_FLAG_PRIMARY;

drivers/media/common/saa7146/saa7146_vbi.c

@@ -348,9 +348,10 @@ static void vbi_stop(struct saa7146_fh *fh, struct file *file)
 	spin_unlock_irqrestore(&dev->slock, flags);
 }
 
-static void vbi_read_timeout(unsigned long data)
+static void vbi_read_timeout(struct timer_list *t)
 {
-	struct file *file = (struct file*)data;
+	struct saa7146_vv *vv = from_timer(vv, t, vbi_read_timeout);
+	struct file *file = vv->vbi_read_timeout_file;
 	struct saa7146_fh *fh = file->private_data;
 	struct saa7146_dev *dev = fh->dev;
 
@@ -401,8 +402,8 @@ static int vbi_open(struct saa7146_dev *dev, struct file *file)
 			    sizeof(struct saa7146_buf),
 			    file, &dev->v4l2_lock);
 
-	vv->vbi_read_timeout.function = vbi_read_timeout;
-	vv->vbi_read_timeout.data = (unsigned long)file;
+	vv->vbi_read_timeout.function = (TIMER_FUNC_TYPE)vbi_read_timeout;
+	vv->vbi_read_timeout_file = file;
 
 	/* initialize the brs */
 	if ( 0 != (SAA7146_USE_PORT_B_FOR_VBI & dev->ext_vv_data->flags)) {

include/media/drv-intf/saa7146_vv.h

@@ -107,6 +107,7 @@ struct saa7146_vv
 	struct saa7146_dmaqueue		vbi_dmaq;
 	struct v4l2_vbi_format		vbi_fmt;
 	struct timer_list		vbi_read_timeout;
+	struct file			*vbi_read_timeout_file;
 	/* vbi workaround interrupt queue */
 	wait_queue_head_t		vbi_wq;
 	int				vbi_fieldcount;