From 87cb0278c9872aced7e01952ff1f84a653cb56e4 Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Sat, 23 Jun 2012 08:46:43 -0300 Subject: [PATCH] [media] fsl-viu: 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/fsl-viu.c | 27 ++++++++++++++++++++++----- 1 file changed, 22 insertions(+), 5 deletions(-) diff --git a/drivers/media/video/fsl-viu.c b/drivers/media/video/fsl-viu.c index 777486f..20f9810 100644 --- a/drivers/media/video/fsl-viu.c +++ b/drivers/media/video/fsl-viu.c @@ -1279,10 +1279,16 @@ static int viu_open(struct file *file) dprintk(1, "open minor=%d type=%s users=%d\n", minor, v4l2_type_names[V4L2_BUF_TYPE_VIDEO_CAPTURE], dev->users); + if (mutex_lock_interruptible(&dev->lock)) { + dev->users--; + return -ERESTARTSYS; + } + /* allocate and initialize per filehandle data */ fh = kzalloc(sizeof(*fh), GFP_KERNEL); if (!fh) { dev->users--; + mutex_unlock(&dev->lock); return -ENOMEM; } @@ -1325,6 +1331,7 @@ static int viu_open(struct file *file) fh->type, V4L2_FIELD_INTERLACED, sizeof(struct viu_buf), fh, &fh->dev->lock); + mutex_unlock(&dev->lock); return 0; } @@ -1340,9 +1347,12 @@ static ssize_t viu_read(struct file *file, char __user *data, size_t count, dev->ovenable = 0; if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) { + if (mutex_lock_interruptible(&dev->lock)) + return -ERESTARTSYS; viu_start_dma(dev); ret = videobuf_read_stream(&fh->vb_vidq, data, count, ppos, 0, file->f_flags & O_NONBLOCK); + mutex_unlock(&dev->lock); return ret; } return 0; @@ -1352,11 +1362,16 @@ static unsigned int viu_poll(struct file *file, struct poll_table_struct *wait) { struct viu_fh *fh = file->private_data; struct videobuf_queue *q = &fh->vb_vidq; + struct viu_dev *dev = fh->dev; + unsigned int res; if (V4L2_BUF_TYPE_VIDEO_CAPTURE != fh->type) return POLLERR; - return videobuf_poll_stream(file, q, wait); + mutex_lock(&dev->lock); + res = videobuf_poll_stream(file, q, wait); + mutex_unlock(&dev->lock); + return res; } static int viu_release(struct file *file) @@ -1365,9 +1380,11 @@ static int viu_release(struct file *file) struct viu_dev *dev = fh->dev; int minor = video_devdata(file)->minor; + mutex_lock(&dev->lock); viu_stop_dma(dev); videobuf_stop(&fh->vb_vidq); videobuf_mmap_free(&fh->vb_vidq); + mutex_unlock(&dev->lock); kfree(fh); @@ -1394,11 +1411,15 @@ void viu_reset(struct viu_reg *reg) static int viu_mmap(struct file *file, struct vm_area_struct *vma) { struct viu_fh *fh = file->private_data; + struct viu_dev *dev = fh->dev; int ret; dprintk(1, "mmap called, vma=0x%08lx\n", (unsigned long)vma); + if (mutex_lock_interruptible(&dev->lock)) + return -ERESTARTSYS; ret = videobuf_mmap_mapper(&fh->vb_vidq, vma); + mutex_unlock(&dev->lock); dprintk(1, "vma start=0x%08lx, size=%ld, ret=%d\n", (unsigned long)vma->vm_start, @@ -1544,10 +1565,6 @@ static int __devinit viu_of_probe(struct platform_device *op) /* initialize locks */ mutex_init(&viu_dev->lock); - /* 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, &viu_dev->vdev->flags); viu_dev->vdev->lock = &viu_dev->lock; spin_lock_init(&viu_dev->slock); -- 2.7.4