From 0b7286d92d43885410b7dbc55b16f658b26976f9 Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Tue, 31 Jul 2012 03:47:07 -0300 Subject: [PATCH] [media] vpif_display: remove V4L2_FL_LOCK_ALL_FOPS Add proper locking to the file operations, allowing for the removal of the V4L2_FL_LOCK_ALL_FOPS flag. Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/davinci/vpif_display.c | 34 ++++++++++++++++++++---------- 1 file changed, 23 insertions(+), 11 deletions(-) diff --git a/drivers/media/video/davinci/vpif_display.c b/drivers/media/video/davinci/vpif_display.c index e129c98..4a24848 100644 --- a/drivers/media/video/davinci/vpif_display.c +++ b/drivers/media/video/davinci/vpif_display.c @@ -695,10 +695,15 @@ static int vpif_mmap(struct file *filep, struct vm_area_struct *vma) struct vpif_fh *fh = filep->private_data; struct channel_obj *ch = fh->channel; struct common_obj *common = &(ch->common[VPIF_VIDEO_INDEX]); + int ret; vpif_dbg(2, debug, "vpif_mmap\n"); - return vb2_mmap(&common->buffer_queue, vma); + if (mutex_lock_interruptible(&common->lock)) + return -ERESTARTSYS; + ret = vb2_mmap(&common->buffer_queue, vma); + mutex_unlock(&common->lock); + return ret; } /* @@ -709,11 +714,15 @@ static unsigned int vpif_poll(struct file *filep, poll_table *wait) struct vpif_fh *fh = filep->private_data; struct channel_obj *ch = fh->channel; struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX]; + unsigned int res = 0; - if (common->started) - return vb2_poll(&common->buffer_queue, filep, wait); + if (common->started) { + mutex_lock(&common->lock); + res = vb2_poll(&common->buffer_queue, filep, wait); + mutex_unlock(&common->lock); + } - return 0; + return res; } /* @@ -723,10 +732,10 @@ static unsigned int vpif_poll(struct file *filep, poll_table *wait) static int vpif_open(struct file *filep) { struct video_device *vdev = video_devdata(filep); - struct channel_obj *ch = NULL; - struct vpif_fh *fh = NULL; + struct channel_obj *ch = video_get_drvdata(vdev); + struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX]; + struct vpif_fh *fh; - ch = video_get_drvdata(vdev); /* Allocate memory for the file handle object */ fh = kzalloc(sizeof(struct vpif_fh), GFP_KERNEL); if (fh == NULL) { @@ -734,6 +743,10 @@ static int vpif_open(struct file *filep) return -ENOMEM; } + if (mutex_lock_interruptible(&common->lock)) { + kfree(fh); + return -ERESTARTSYS; + } /* store pointer to fh in private_data member of filep */ filep->private_data = fh; fh->channel = ch; @@ -751,6 +764,7 @@ static int vpif_open(struct file *filep) /* Initialize priority of this instance to default priority */ fh->prio = V4L2_PRIORITY_UNSET; v4l2_prio_open(&ch->prio, &fh->prio); + mutex_unlock(&common->lock); return 0; } @@ -765,6 +779,7 @@ static int vpif_release(struct file *filep) struct channel_obj *ch = fh->channel; struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX]; + mutex_lock(&common->lock); /* if this instance is doing IO */ if (fh->io_allowed[VPIF_VIDEO_INDEX]) { /* Reset io_usrs member of channel object */ @@ -799,6 +814,7 @@ static int vpif_release(struct file *filep) v4l2_prio_close(&ch->prio, fh->prio); filep->private_data = NULL; fh->initialized = 0; + mutex_unlock(&common->lock); kfree(fh); return 0; @@ -1789,10 +1805,6 @@ static __init int vpif_probe(struct platform_device *pdev) v4l2_prio_init(&ch->prio); ch->common[VPIF_VIDEO_INDEX].fmt.type = V4L2_BUF_TYPE_VIDEO_OUTPUT; - /* Locking in file operations other than ioctl should be done - by the driver, not the V4L2 core. - This driver needs auditing so that this flag can be removed. */ - set_bit(V4L2_FL_LOCK_ALL_FOPS, &ch->video_dev->flags); ch->video_dev->lock = &common->lock; /* register video device */ -- 2.7.4