Commit 3117beec authored by Michael Krufky's avatar Michael Krufky Committed by Mauro Carvalho Chehab
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V4L/DVB (4316): Check __must_check warnings 




Check __must_check warnings for class_device_register and class_device_create_file

video_device_create_file was declared as a void, but instead should
return the int value of class_device_create_file.

Move the check from bttv-driver.c into v4l2-dev.h, because all other
callers of video_device_create_file must also be checked.

Replace the call to class_device_create_file in videodev.c with
video_device_create_file, as defined in v4l2-dev.h, so that the
return value of class_device_create_file will be checked.

Check the return value of class_device_register in videodev.c and
pvrusb2-sysfs.c

Signed-off-by: default avatarMichael Krufky <mkrufky@linuxtv.org>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@infradead.org>
parent d9cd2d9b

drivers/media/video/bt8xx/bttv-driver.c

+2 −6
Original line number Diff line number Diff line
@@ -3909,8 +3909,6 @@ static void bttv_unregister_video(struct bttv *btv) 
/* register video4linux devices */

static int __devinit bttv_register_video(struct bttv *btv)

{

	int ret;



	if (no_overlay <= 0) {

		bttv_video_template.type |= VID_TYPE_OVERLAY;

	} else {
@@ -3925,10 +3923,8 @@ static int __devinit bttv_register_video(struct bttv *btv) 
		goto err;

	printk(KERN_INFO "bttv%d: registered device video%d\n",

	       btv->c.nr,btv->video_dev->minor & 0x1f);

	ret = video_device_create_file(btv->video_dev, &class_device_attr_card);

	if (ret < 0)

		printk(KERN_WARNING "bttv: video_device_create_file error: "

			"%d\n", ret);



	video_device_create_file(btv->video_dev, &class_device_attr_card);



	/* vbi */

	btv->vbi_dev = vdev_init(btv, &bttv_vbi_template, "vbi");

drivers/media/video/pvrusb2/pvrusb2-sysfs.c

+28 −5
Original line number Diff line number Diff line
@@ -600,6 +600,8 @@ static ssize_t debugcmd_store(struct class_device *,const char *,size_t count); 
static void pvr2_sysfs_add_debugifc(struct pvr2_sysfs *sfp)

{

	struct pvr2_sysfs_debugifc *dip;

	int ret;



	dip = kmalloc(sizeof(*dip),GFP_KERNEL);

	if (!dip) return;

	memset(dip,0,sizeof(*dip));
@@ -613,8 +615,14 @@ static void pvr2_sysfs_add_debugifc(struct pvr2_sysfs *sfp) 
	dip->attr_debuginfo.attr.mode = S_IRUGO;

	dip->attr_debuginfo.show = debuginfo_show;

	sfp->debugifc = dip;

	class_device_create_file(sfp->class_dev,&dip->attr_debugcmd);

	class_device_create_file(sfp->class_dev,&dip->attr_debuginfo);

	ret = class_device_create_file(sfp->class_dev,&dip->attr_debugcmd);

	if (ret < 0)

		printk(KERN_WARNING "%s: class_device_create_file error: %d\n",

		       __FUNCTION__, ret);

	ret = class_device_create_file(sfp->class_dev,&dip->attr_debuginfo);

	if (ret < 0)

		printk(KERN_WARNING "%s: class_device_create_file error: %d\n",

		       __FUNCTION__, ret);

}
@@ -709,6 +717,8 @@ static void class_dev_create(struct pvr2_sysfs *sfp, 
{

	struct usb_device *usb_dev;

	struct class_device *class_dev;

	int ret;



	usb_dev = pvr2_hdw_get_dev(sfp->channel.hdw);

	if (!usb_dev) return;

	class_dev = kmalloc(sizeof(*class_dev),GFP_KERNEL);
@@ -733,20 +743,33 @@ static void class_dev_create(struct pvr2_sysfs *sfp, 


	sfp->class_dev = class_dev;

	class_dev->class_data = sfp;

	class_device_register(class_dev);

	ret = class_device_register(class_dev);

	if (ret) {

		printk(KERN_ERR "%s: class_device_register failed\n",

		       __FUNCTION__);

		kfree(class_dev);

		return;

	}



	sfp->attr_v4l_minor_number.attr.owner = THIS_MODULE;

	sfp->attr_v4l_minor_number.attr.name = "v4l_minor_number";

	sfp->attr_v4l_minor_number.attr.mode = S_IRUGO;

	sfp->attr_v4l_minor_number.show = v4l_minor_number_show;

	sfp->attr_v4l_minor_number.store = NULL;

	class_device_create_file(sfp->class_dev,&sfp->attr_v4l_minor_number);

	ret = class_device_create_file(sfp->class_dev,&sfp->attr_v4l_minor_number);

	if (ret < 0)

		printk(KERN_WARNING "%s: class_device_create_file error: %d\n",

		       __FUNCTION__, ret);



	sfp->attr_unit_number.attr.owner = THIS_MODULE;

	sfp->attr_unit_number.attr.name = "unit_number";

	sfp->attr_unit_number.attr.mode = S_IRUGO;

	sfp->attr_unit_number.show = unit_number_show;

	sfp->attr_unit_number.store = NULL;

	class_device_create_file(sfp->class_dev,&sfp->attr_unit_number);

	ret = class_device_create_file(sfp->class_dev,&sfp->attr_unit_number);

	if (ret < 0)

		printk(KERN_WARNING "%s: class_device_create_file error: %d\n",

		       __FUNCTION__, ret);



	pvr2_sysfs_add_controls(sfp);

#ifdef CONFIG_VIDEO_PVRUSB2_DEBUGIFC

drivers/media/video/videodev.c

+8 −3
Original line number Diff line number Diff line
@@ -1512,6 +1512,7 @@ int video_register_device(struct video_device *vfd, int type, int nr) 
	int i=0;

	int base;

	int end;

	int ret;

	char *name_base;



	switch(type)
@@ -1571,9 +1572,13 @@ int video_register_device(struct video_device *vfd, int type, int nr) 
	vfd->class_dev.class       = &video_class;

	vfd->class_dev.devt        = MKDEV(VIDEO_MAJOR, vfd->minor);

	sprintf(vfd->class_dev.class_id, "%s%d", name_base, i - base);

	class_device_register(&vfd->class_dev);

	class_device_create_file(&vfd->class_dev,

				&class_device_attr_name);

	ret = class_device_register(&vfd->class_dev);

	if (ret) {

		printk(KERN_ERR "%s: class_device_register failed\n",

		       __FUNCTION__);

		return ret;

	}

	video_device_create_file(vfd, &class_device_attr_name);



#if 1

	/* needed until all drivers are fixed */

include/media/v4l2-dev.h

+5 −2
Original line number Diff line number Diff line
@@ -341,11 +341,14 @@ extern int video_usercopy(struct inode *inode, struct file *file, 
extern struct video_device* video_devdata(struct file*);



#define to_video_device(cd) container_of(cd, struct video_device, class_dev)

static inline void

static inline int

video_device_create_file(struct video_device *vfd,

			 struct class_device_attribute *attr)

{

	class_device_create_file(&vfd->class_dev, attr);

	int ret = class_device_create_file(&vfd->class_dev, attr);

	if (ret < 0)

		printk(KERN_WARNING "%s error: %d\n", __FUNCTION__, ret);

	return ret;

}

static inline void

video_device_remove_file(struct video_device *vfd,

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