Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752696Ab1DEDao (ORCPT ); Mon, 4 Apr 2011 23:30:44 -0400 Received: from mail-yx0-f174.google.com ([209.85.213.174]:62881 "EHLO mail-yx0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751723Ab1DEDal (ORCPT ); Mon, 4 Apr 2011 23:30:41 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=date:from:to:cc:subject:message-id:references:mime-version :content-type:content-disposition:in-reply-to:user-agent; b=lPnroZ99P8HKU0bgR1e/hJou3JFUfnXHygAK3yq4uGNOl14ogKbkXHeU8bHMZt9Ifa YwUx3NBFAQGsCbFPCMMah5lqO0zHeW6j4XLQDSZSzVO25iagaiyk+luT2bIyXQK1XdYg cv6O8QlZKlJTbDm8jnhZihYuOTyJatnS/5QJw= Date: Mon, 4 Apr 2011 22:30:35 -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 6/7] [media] cx88: don't use atomic_t for core->mpeg_users Message-ID: <20110405033035.GG4498@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> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2684 Lines: 81 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. Signed-off-by: Jonathan Nieder --- drivers/media/video/cx88/cx88-blackbird.c | 11 ++++++----- drivers/media/video/cx88/cx88.h | 2 +- 2 files changed, 7 insertions(+), 6 deletions(-) diff --git a/drivers/media/video/cx88/cx88-blackbird.c b/drivers/media/video/cx88/cx88-blackbird.c index fa8e347..11e49bb 100644 --- a/drivers/media/video/cx88/cx88-blackbird.c +++ b/drivers/media/video/cx88/cx88-blackbird.c @@ -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); diff --git a/drivers/media/video/cx88/cx88.h b/drivers/media/video/cx88/cx88.h index 3d32f4a..9e8176e 100644 --- a/drivers/media/video/cx88/cx88.h +++ b/drivers/media/video/cx88/cx88.h @@ -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; -- 1.7.5.rc0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/