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[media] cx88: don't use atomic_t for core->mpeg_users

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mpeg_users is always read or written with core->lock held except
in mpeg_release (where it looks like a bug).  A plain int is simpler
and faster.

Tested-by: Andi Huber <hobrom@gmx.at>
Tested-by: Marlon de Boer <marlon@hyves.nl>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Jonathan Nieder 2011-05-01 06:31:04 -03:00 committed by Mauro Carvalho Chehab
parent 579b2b4512
commit f4bd4be8d1
2 changed files with 7 additions and 6 deletions
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11
drivers/media/video/cx88/cx88-blackbird.c
View file

@ -1073,7 +1073,7 @@ static int mpeg_open(struct file *file)
return err;
}
if (!atomic_read(&dev->core->mpeg_users) && blackbird_initialize_codec(dev) < 0) {
if (!dev->core->mpeg_users && blackbird_initialize_codec(dev) < 0) {
drv->request_release(drv);
mutex_unlock(&dev->core->lock);
return -EINVAL;
@ -1101,7 +1101,7 @@ static int mpeg_open(struct file *file)
cx88_set_scale(dev->core, dev->width, dev->height,
fh->mpegq.field);
atomic_inc(&dev->core->mpeg_users);
dev->core->mpeg_users++;
mutex_unlock(&dev->core->lock);
return 0;
}
@ -1112,7 +1112,9 @@ static int mpeg_release(struct file *file)
struct cx8802_dev *dev = fh->dev;
struct cx8802_driver *drv = NULL;
if (dev->mpeg_active && atomic_read(&dev->core->mpeg_users) == 1)
mutex_lock(&dev->core->lock);
if (dev->mpeg_active && dev->core->mpeg_users == 1)
blackbird_stop_codec(dev);
cx8802_cancel_buffers(fh->dev);
@ -1121,7 +1123,6 @@ static int mpeg_release(struct file *file)
videobuf_mmap_free(&fh->mpegq);
mutex_lock(&dev->core->lock);
file->private_data = NULL;
kfree(fh);
@ -1131,7 +1132,7 @@ static int mpeg_release(struct file *file)
if (drv)
drv->request_release(drv);
atomic_dec(&dev->core->mpeg_users);
dev->core->mpeg_users--;
mutex_unlock(&dev->core->lock);

2
drivers/media/video/cx88/cx88.h
View file

@ -390,7 +390,7 @@ struct cx88_core {
/* various v4l controls */
u32 freq;
atomic_t users;
atomic_t mpeg_users;
int mpeg_users;
/* cx88-video needs to access cx8802 for hybrid tuner pll access. */
struct cx8802_dev *dvbdev;