drm/udl: take reference to device struct for dma-bufs

this stops the device from being deleted before all the dma-bufs
on it are freed, this fixes an oops when you unplug a udl device while
it has imported a buffer from another device.

Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/udl/udl_gem.c b/drivers/gpu/drm/udl/udl_gem.c
index 8d67b943ac05ce2d1dd44597d00a1e5a07fd9bdb..0394811251bd7e8dd75159d9d01b045d089d2290 100644 (file)
--- a/drivers/gpu/drm/udl/udl_gem.c
+++ b/drivers/gpu/drm/udl/udl_gem.c
@@ -177,8 +177,10 @@ void udl_gem_free_object(struct drm_gem_object *gem_obj)
        if (obj->vmapping)
                udl_gem_vunmap(obj);
 
-       if (gem_obj->import_attach)
+       if (gem_obj->import_attach) {
                drm_prime_gem_destroy(gem_obj, obj->sg);
+               put_device(gem_obj->dev->dev);
+       }
 
        if (obj->pages)
                udl_gem_put_pages(obj);
@@ -256,9 +258,12 @@ struct drm_gem_object *udl_gem_prime_import(struct drm_device *dev,
        int ret;
 
        /* need to attach */
+       get_device(dev->dev);
        attach = dma_buf_attach(dma_buf, dev->dev);
-       if (IS_ERR(attach))
+       if (IS_ERR(attach)) {
+               put_device(dev->dev);
                return ERR_CAST(attach);
+       }
 
        get_dma_buf(dma_buf);
 
@@ -282,6 +287,6 @@ fail_unmap:
 fail_detach:
        dma_buf_detach(dma_buf, attach);
        dma_buf_put(dma_buf);
-
+       put_device(dev->dev);
        return ERR_PTR(ret);
 }