[PATCH 1/2] drm/msm: Fix wait_fence submitqueue leak

[Rob Clark]

From: Rob Clark <robdcl...@chromium.org>

We weren't dropping the submitqueue reference in all paths.  In
particular, when the fence has already been signalled. Split out
a helper to simplify handling this in the various different return
paths.

Fixes: a61acbbe9cf8 ("drm/msm: Track "seqno" fences by idr")
Signed-off-by: Rob Clark <robdcl...@chromium.org>
---
 drivers/gpu/drm/msm/msm_drv.c | 49 +++++++++++++++++++++--------------
 1 file changed, 29 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 73e827641024..cb14d997c174 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -961,29 +961,12 @@ static int msm_ioctl_gem_info(struct drm_device *dev, 
void *data,
        return ret;
 }
 
-static int msm_ioctl_wait_fence(struct drm_device *dev, void *data,
-               struct drm_file *file)
+static int wait_fence(struct msm_gpu_submitqueue *queue, uint32_t fence_id,
+                     ktime_t timeout)
 {
-       struct msm_drm_private *priv = dev->dev_private;
-       struct drm_msm_wait_fence *args = data;
-       ktime_t timeout = to_ktime(args->timeout);
-       struct msm_gpu_submitqueue *queue;
-       struct msm_gpu *gpu = priv->gpu;
        struct dma_fence *fence;
        int ret;
 
-       if (args->pad) {
-               DRM_ERROR("invalid pad: %08x\n", args->pad);
-               return -EINVAL;
-       }
-
-       if (!gpu)
-               return 0;
-
-       queue = msm_submitqueue_get(file->driver_priv, args->queueid);
-       if (!queue)
-               return -ENOENT;
-
        /*
         * Map submitqueue scoped "seqno" (which is actually an idr key)
         * back to underlying dma-fence
@@ -995,7 +978,7 @@ static int msm_ioctl_wait_fence(struct drm_device *dev, 
void *data,
        ret = mutex_lock_interruptible(&queue->lock);
        if (ret)
                return ret;
-       fence = idr_find(&queue->fence_idr, args->fence);
+       fence = idr_find(&queue->fence_idr, fence_id);
        if (fence)
                fence = dma_fence_get_rcu(fence);
        mutex_unlock(&queue->lock);
@@ -1011,6 +994,32 @@ static int msm_ioctl_wait_fence(struct drm_device *dev, 
void *data,
        }
 
        dma_fence_put(fence);
+
+       return ret;
+}
+
+static int msm_ioctl_wait_fence(struct drm_device *dev, void *data,
+               struct drm_file *file)
+{
+       struct msm_drm_private *priv = dev->dev_private;
+       struct drm_msm_wait_fence *args = data;
+       struct msm_gpu_submitqueue *queue;
+       int ret;
+
+       if (args->pad) {
+               DRM_ERROR("invalid pad: %08x\n", args->pad);
+               return -EINVAL;
+       }
+
+       if (!priv->gpu)
+               return 0;
+
+       queue = msm_submitqueue_get(file->driver_priv, args->queueid);
+       if (!queue)
+               return -ENOENT;
+
+       ret = wait_fence(queue, args->fence, to_ktime(args->timeout));
+
        msm_submitqueue_put(queue);
 
        return ret;
-- 
2.31.1