[RFC PATCH 21/26] s5p-g2d: remove V4L2_FL_LOCK_ALL_FOPS

[Hans Verkuil]

From: Hans Verkuil <hans.verk...@cisco.com>

Add proper locking to the file operations, allowing for the removal
of the V4L2_FL_LOCK_ALL_FOPS flag.

Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
---
 drivers/media/video/s5p-g2d/g2d.c |   27 +++++++++++++++++++++------
 1 file changed, 21 insertions(+), 6 deletions(-)

diff --git a/drivers/media/video/s5p-g2d/g2d.c 
b/drivers/media/video/s5p-g2d/g2d.c
index 7c98ee7..d8cf1db 100644
--- a/drivers/media/video/s5p-g2d/g2d.c
+++ b/drivers/media/video/s5p-g2d/g2d.c
@@ -248,9 +248,14 @@ static int g2d_open(struct file *file)
        ctx->in         = def_frame;
        ctx->out        = def_frame;
 
+       if (mutex_lock_interruptible(&dev->mutex)) {
+               kfree(ctx);
+               return -ERESTARTSYS;
+       }
        ctx->m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev, ctx, &queue_init);
        if (IS_ERR(ctx->m2m_ctx)) {
                ret = PTR_ERR(ctx->m2m_ctx);
+               mutex_unlock(&dev->mutex);
                kfree(ctx);
                return ret;
        }
@@ -264,6 +269,7 @@ static int g2d_open(struct file *file)
        v4l2_ctrl_handler_setup(&ctx->ctrl_handler);
 
        ctx->fh.ctrl_handler = &ctx->ctrl_handler;
+       mutex_unlock(&dev->mutex);
 
        v4l2_info(&dev->v4l2_dev, "instance opened\n");
        return 0;
@@ -401,13 +407,26 @@ static int vidioc_s_fmt(struct file *file, void *prv, 
struct v4l2_format *f)
 static unsigned int g2d_poll(struct file *file, struct poll_table_struct *wait)
 {
        struct g2d_ctx *ctx = fh2ctx(file->private_data);
-       return v4l2_m2m_poll(file, ctx->m2m_ctx, wait);
+       struct g2d_dev *dev = ctx->dev;
+       unsigned int res;
+
+       mutex_lock(&dev->mutex);
+       res = v4l2_m2m_poll(file, ctx->m2m_ctx, wait);
+       mutex_unlock(&dev->mutex);
+       return res;
 }
 
 static int g2d_mmap(struct file *file, struct vm_area_struct *vma)
 {
        struct g2d_ctx *ctx = fh2ctx(file->private_data);
-       return v4l2_m2m_mmap(file, ctx->m2m_ctx, vma);
+       struct g2d_dev *dev = ctx->dev;
+       int ret;
+
+       if (mutex_lock_interruptible(&dev->mutex))
+               return -ERESTARTSYS;
+       ret = v4l2_m2m_mmap(file, ctx->m2m_ctx, vma);
+       mutex_unlock(&dev->mutex);
+       return ret;
 }
 
 static int vidioc_reqbufs(struct file *file, void *priv,
@@ -748,10 +767,6 @@ static int g2d_probe(struct platform_device *pdev)
                goto unreg_v4l2_dev;
        }
        *vfd = g2d_videodev;
-       /* 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, &vfd->flags);
        vfd->lock = &dev->mutex;
        ret = video_register_device(vfd, VFL_TYPE_GRABBER, 0);
        if (ret) {
-- 
1.7.10

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