From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-yi0-f46.google.com ([209.85.218.46]:33263 "EHLO mail-yi0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751739Ab1DEDbY (ORCPT ); Mon, 4 Apr 2011 23:31:24 -0400 Date: Mon, 4 Apr 2011 22:31:15 -0500 From: Jonathan Nieder To: linux-media@vger.kernel.org Cc: Huber Andreas , Mauro Carvalho Chehab , Hans Verkuil , linux-kernel@vger.kernel.org, Ben Hutchings , Steven Toth Subject: [PATCH 7/7] [mpeg] cx88: don't use atomic_t for core->users Message-ID: <20110405033114.GH4498@elie> References: <20110327150610.4029.95961.reportbug@xen.corax.at> <20110327152810.GA32106@elie> <20110402093856.GA17015@elie> <20110405032014.GA4498@elie> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20110405032014.GA4498@elie> List-ID: Sender: users is always read or written with core->lock held. A plain int is simpler and faster. Signed-off-by: Jonathan Nieder --- Thanks for reading. drivers/media/video/cx88/cx88-video.c | 5 +++-- drivers/media/video/cx88/cx88.h | 2 +- 2 files changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/media/video/cx88/cx88-video.c b/drivers/media/video/cx88/cx88-video.c index 287a41e..d719d12 100644 --- a/drivers/media/video/cx88/cx88-video.c +++ b/drivers/media/video/cx88/cx88-video.c @@ -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); diff --git a/drivers/media/video/cx88/cx88.h b/drivers/media/video/cx88/cx88.h index 9e8176e..a399a8b 100644 --- a/drivers/media/video/cx88/cx88.h +++ b/drivers/media/video/cx88/cx88.h @@ -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. */ -- 1.7.5.rc0