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[media] go7007: fix unregister/disconnect handling

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- use the v4l2_device's release() callback
- remove the unnecessary ref_count
- don't free usb data structures on disconnect, only do that in the final
  release callback.
This is the correct way in order to safely handle disconnect and removal
of modules.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil
2013-03-11 04:48:30 -03:00
committed by Mauro Carvalho Chehab
parent 95ef39403f
commit d5d3a7cc12
6 changed files with 85 additions and 80 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

63
drivers/staging/media/go7007/go7007-driver.c
View File

@ -220,6 +220,31 @@ static int init_i2c_module(struct i2c_adapter *adapter, const struct go_i2c *con
return -EINVAL;
}
/*
* Detach and unregister the encoder. The go7007 struct won't be freed
* until v4l2 finishes releasing its resources and all associated fds are
* closed by applications.
*/
static void go7007_remove(struct v4l2_device *v4l2_dev)
{
struct go7007 *go = container_of(v4l2_dev, struct go7007, v4l2_dev);
v4l2_device_unregister(v4l2_dev);
if (go->hpi_ops->release)
go->hpi_ops->release(go);
if (go->i2c_adapter_online) {
if (i2c_del_adapter(&go->i2c_adapter) == 0)
go->i2c_adapter_online = 0;
else
v4l2_err(&go->v4l2_dev,
"error removing I2C adapter!\n");
}
kfree(go->boot_fw);
go7007_v4l2_remove(go);
kfree(go);
}
/*
* Finalize the GO7007 hardware setup, register the on-board I2C adapter
* (if used on this board), load the I2C client driver for the sensor
@ -234,17 +259,17 @@ int go7007_register_encoder(struct go7007 *go, unsigned num_i2c_devs)
dev_info(go->dev, "go7007: registering new %s\n", go->name);
go->v4l2_dev.release = go7007_remove;
ret = v4l2_device_register(go->dev, &go->v4l2_dev);
if (ret < 0)
return ret;
mutex_lock(&go->hw_lock);
ret = go7007_init_encoder(go);
mutex_unlock(&go->hw_lock);
if (ret < 0)
return -1;
/* v4l2 init must happen before i2c subdevs */
ret = go7007_v4l2_init(go);
if (ret < 0)
return ret;
if (!go->i2c_adapter_online &&
go->board_info->flags & GO7007_BOARD_USE_ONBOARD_I2C) {
if (go7007_i2c_init(go) < 0)
@ -269,6 +294,11 @@ int go7007_register_encoder(struct go7007 *go, unsigned num_i2c_devs)
v4l2_subdev_call(go->sd_video, video, s_routing,
0, 0, go->channel_number + 1);
}
ret = go7007_v4l2_init(go);
if (ret < 0)
return ret;
if (go->board_info->flags & GO7007_BOARD_HAS_AUDIO) {
go->audio_enabled = 1;
go7007_snd_init(go);
@ -608,7 +638,6 @@ struct go7007 *go7007_alloc(struct go7007_board_info *board, struct device *dev)
init_waitqueue_head(&go->frame_waitq);
spin_lock_init(&go->spinlock);
go->video_dev = NULL;
go->ref_count = 0;
go->status = STATUS_INIT;
memset(&go->i2c_adapter, 0, sizeof(go->i2c_adapter));
go->i2c_adapter_online = 0;
@ -658,26 +687,4 @@ struct go7007 *go7007_alloc(struct go7007_board_info *board, struct device *dev)
}
EXPORT_SYMBOL(go7007_alloc);
/*
* Detach and unregister the encoder. The go7007 struct won't be freed
* until v4l2 finishes releasing its resources and all associated fds are
* closed by applications.
*/
void go7007_remove(struct go7007 *go)
{
if (go->i2c_adapter_online) {
if (i2c_del_adapter(&go->i2c_adapter) == 0)
go->i2c_adapter_online = 0;
else
v4l2_err(&go->v4l2_dev,
"error removing I2C adapter!\n");
}
if (go->audio_enabled)
go7007_snd_remove(go);
kfree(go->boot_fw);
go7007_v4l2_remove(go);
}
EXPORT_SYMBOL(go7007_remove);
MODULE_LICENSE("GPL v2");

4
drivers/staging/media/go7007/go7007-priv.h
View File

@ -117,6 +117,7 @@ struct go7007_hpi_ops {
int (*stream_stop)(struct go7007 *go);
int (*send_firmware)(struct go7007 *go, u8 *data, int len);
int (*send_command)(struct go7007 *go, unsigned int cmd, void *arg);
void (*release)(struct go7007 *go);
};
/* The video buffer size must be a multiple of PAGE_SIZE */
@ -181,7 +182,6 @@ struct go7007 {
void *boot_fw;
unsigned boot_fw_len;
struct v4l2_device v4l2_dev;
int ref_count;
enum { STATUS_INIT, STATUS_ONLINE, STATUS_SHUTDOWN } status;
spinlock_t spinlock;
struct mutex hw_lock;
@ -287,8 +287,6 @@ int go7007_start_encoder(struct go7007 *go);
void go7007_parse_video_stream(struct go7007 *go, u8 *buf, int length);
struct go7007 *go7007_alloc(struct go7007_board_info *board,
struct device *dev);
void go7007_remove(struct go7007 *go);
/* go7007-fw.c */
int go7007_construct_fw_image(struct go7007 *go, u8 **fw, int *fwlen);

64
drivers/staging/media/go7007/go7007-usb.c
View File

@ -617,6 +617,8 @@ static int go7007_usb_interface_reset(struct go7007 *go)
struct go7007_usb *usb = go->hpi_context;
u16 intr_val, intr_data;
if (go->status == STATUS_SHUTDOWN)
return -1;
/* Reset encoder */
if (go7007_write_interrupt(go, 0x0001, 0x0001) < 0)
return -1;
@ -886,6 +888,35 @@ static int go7007_usb_send_firmware(struct go7007 *go, u8 *data, int len)
&transferred, timeout);
}
static void go7007_usb_release(struct go7007 *go)
{
struct go7007_usb *usb = go->hpi_context;
struct urb *vurb, *aurb;
int i;
usb_kill_urb(usb->intr_urb);
/* Free USB-related structs */
for (i = 0; i < 8; ++i) {
vurb = usb->video_urbs[i];
if (vurb) {
usb_kill_urb(vurb);
kfree(vurb->transfer_buffer);
usb_free_urb(vurb);
}
aurb = usb->audio_urbs[i];
if (aurb) {
usb_kill_urb(aurb);
kfree(aurb->transfer_buffer);
usb_free_urb(aurb);
}
}
kfree(usb->intr_urb->transfer_buffer);
usb_free_urb(usb->intr_urb);
kfree(go->hpi_context);
}
static struct go7007_hpi_ops go7007_usb_ezusb_hpi_ops = {
.interface_reset = go7007_usb_interface_reset,
.write_interrupt = go7007_usb_ezusb_write_interrupt,
@ -893,6 +924,7 @@ static struct go7007_hpi_ops go7007_usb_ezusb_hpi_ops = {
.stream_start = go7007_usb_stream_start,
.stream_stop = go7007_usb_stream_stop,
.send_firmware = go7007_usb_send_firmware,
.release = go7007_usb_release,
};
static struct go7007_hpi_ops go7007_usb_onboard_hpi_ops = {
@ -902,6 +934,7 @@ static struct go7007_hpi_ops go7007_usb_onboard_hpi_ops = {
.stream_start = go7007_usb_stream_start,
.stream_stop = go7007_usb_stream_stop,
.send_firmware = go7007_usb_send_firmware,
.release = go7007_usb_release,
};
/********************* Driver for EZ-USB I2C adapter *********************/
@ -1279,34 +1312,15 @@ allocfail:
static void go7007_usb_disconnect(struct usb_interface *intf)
{
struct go7007 *go = to_go7007(usb_get_intfdata(intf));
struct go7007_usb *usb = go->hpi_context;
struct urb *vurb, *aurb;
int i;
usb_kill_urb(usb->intr_urb);
/* Free USB-related structs */
for (i = 0; i < 8; ++i) {
vurb = usb->video_urbs[i];
if (vurb) {
usb_kill_urb(vurb);
kfree(vurb->transfer_buffer);
usb_free_urb(vurb);
}
aurb = usb->audio_urbs[i];
if (aurb) {
usb_kill_urb(aurb);
kfree(aurb->transfer_buffer);
usb_free_urb(aurb);
}
}
kfree(usb->intr_urb->transfer_buffer);
usb_free_urb(usb->intr_urb);
kfree(go->hpi_context);
if (go->audio_enabled)
go7007_snd_remove(go);
go->status = STATUS_SHUTDOWN;
go7007_remove(go);
v4l2_device_disconnect(&go->v4l2_dev);
video_unregister_device(go->video_dev);
v4l2_device_put(&go->v4l2_dev);
}
static struct usb_driver go7007_usb_driver = {

22
drivers/staging/media/go7007/go7007-v4l2.c
View File

@ -100,7 +100,6 @@ static int go7007_open(struct file *file)
gofh = kzalloc(sizeof(struct go7007_file), GFP_KERNEL);
if (gofh == NULL)
return -ENOMEM;
++go->ref_count;
gofh->go = go;
mutex_init(&gofh->lock);
gofh->buf_count = 0;
@ -120,8 +119,6 @@ static int go7007_release(struct file *file)
gofh->buf_count = 0;
}
kfree(gofh);
if (--go->ref_count == 0)
kfree(go);
file->private_data = NULL;
return 0;
}
@ -1772,11 +1769,7 @@ static unsigned int go7007_poll(struct file *file, poll_table *wait)
static void go7007_vfl_release(struct video_device *vfd)
{
struct go7007 *go = video_get_drvdata(vfd);
video_device_release(vfd);
if (--go->ref_count == 0)
kfree(go);
}
static struct v4l2_file_operations go7007_fops = {
@ -1844,7 +1837,8 @@ int go7007_v4l2_init(struct go7007 *go)
if (go->video_dev == NULL)
return -ENOMEM;
*go->video_dev = go7007_template;
go->video_dev->parent = go->dev;
video_set_drvdata(go->video_dev, go);
go->video_dev->v4l2_dev = &go->v4l2_dev;
rv = video_register_device(go->video_dev, VFL_TYPE_GRABBER, -1);
if (rv < 0) {
video_device_release(go->video_dev);
@ -1856,14 +1850,6 @@ int go7007_v4l2_init(struct go7007 *go)
v4l2_disable_ioctl(go->video_dev, VIDIOC_S_AUDIO);
v4l2_disable_ioctl(go->video_dev, VIDIOC_ENUMAUDIO);
}
rv = v4l2_device_register(go->dev, &go->v4l2_dev);
if (rv < 0) {
video_device_release(go->video_dev);
go->video_dev = NULL;
return rv;
}
video_set_drvdata(go->video_dev, go);
++go->ref_count;
dev_info(go->dev, "registered device %s [v4l2]\n",
video_device_node_name(go->video_dev));
@ -1883,8 +1869,4 @@ void go7007_v4l2_remove(struct go7007 *go)
spin_unlock_irqrestore(&go->spinlock, flags);
}
mutex_unlock(&go->hw_lock);
if (go->video_dev)
video_unregister_device(go->video_dev);
if (go->status != STATUS_SHUTDOWN)
v4l2_device_unregister(&go->v4l2_dev);
}

7
drivers/staging/media/go7007/saa7134-go7007.c
View File

@ -499,12 +499,17 @@ static int saa7134_go7007_fini(struct saa7134_dev *dev)
return 0;
go = video_get_drvdata(dev->empress_dev);
if (go->audio_enabled)
go7007_snd_remove(go);
saa = go->hpi_context;
go->status = STATUS_SHUTDOWN;
free_page((unsigned long)saa->top);
free_page((unsigned long)saa->bottom);
kfree(saa);
go7007_remove(go);
video_unregister_device(&go->vdev);
v4l2_device_put(&go->v4l2_dev);
dev->empress_dev = NULL;
return 0;

5
drivers/staging/media/go7007/snd-go7007.c
View File

@ -221,8 +221,6 @@ static int go7007_snd_free(struct snd_device *device)
kfree(go->snd_context);
go->snd_context = NULL;
if (--go->ref_count == 0)
kfree(go);
return 0;
}
@ -285,8 +283,8 @@ int go7007_snd_init(struct go7007 *go)
gosnd->substream = NULL;
go->snd_context = gosnd;
v4l2_device_get(&go->v4l2_dev);
++dev;
++go->ref_count;
return 0;
}
@ -298,6 +296,7 @@ int go7007_snd_remove(struct go7007 *go)
snd_card_disconnect(gosnd->card);
snd_card_free_when_closed(gosnd->card);
v4l2_device_put(&go->v4l2_dev);
return 0;
}
EXPORT_SYMBOL(go7007_snd_remove);