AcoSail/kernel_optimize_test
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[media] cx88: don't use atomic_t for core->users

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users is always read or written with core->lock held.  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 06:31:40 -03:00 committed by Mauro Carvalho Chehab
parent f4bd4be8d1
commit 8d11593162
2 changed files with 4 additions and 3 deletions
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5
drivers/media/video/cx88/cx88-video.c
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@ -824,7 +824,7 @@ static int video_open(struct file *file)
call_all(core, tuner, s_radio);
}
atomic_inc(&core->users);
core->users++;
mutex_unlock(&core->lock);
return 0;
@ -922,7 +922,8 @@ static int video_release(struct file *file)
file->private_data = NULL;
kfree(fh);
if(atomic_dec_and_test(&dev->core->users))
dev->core->users--;
if (!dev->core->users)
call_all(dev->core, core, s_power, 0);
mutex_unlock(&dev->core->lock);

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

@ -389,7 +389,7 @@ struct cx88_core {
struct mutex lock;
/* various v4l controls */
u32 freq;
atomic_t users;
int users;
int mpeg_users;
/* cx88-video needs to access cx8802 for hybrid tuner pll access. */