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media/saa7146: Convert timers to use timer_setup()

PATCH New Kees Cook 1 participant 1 message Oct 16, 2017

Subsystems (2)
Media (V4L/DVB) SAA7146 VIDEO4LINUX-2 driver
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Kees Cook

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PATCH 1/1 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.

Cc Hans Verkuil <[email protected]>
Cc Mauro Carvalho Chehab <[email protected]>
Cc [email protected]
Signed-off-by Kees Cook <[email protected]>
---
 drivers/media/common/saa7146/saa7146_fops.c | 2 +-
 drivers/media/common/saa7146/saa7146_vbi.c  | 9 +++++----
 include/media/drv-intf/saa7146_vv.h         | 1 +
 3 files changed, 7 insertions(+), 5 deletions(-)
drivers/media/common/saa7146/saa7146_fops.c +1 -1
index 930d2c94d5d3..c4664f0da874 100644
@@ -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 +5 -4
index 69525ca4f52c..ae66c2325228 100644
@@ -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 +1 -0
index 736f4f2d8290..926c5b145279 100644
@@ -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;
Signature · 6 lines
2.7.4


-- 
Kees Cook
Pixel Security