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xen/gntdev: Check and release imported dma-bufs on close
Check if there are any imported dma-bufs left not released by user-space when grant device's release callback is called and free those if this is the case. This can happen if user-space leaks the buffers because of a bug or application has been terminated for any reason. Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> Reviewed-by: Boris Ostrovsky@oracle.com> Signed-off-by: Juergen Gross <jgross@suse.com>
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@ -745,6 +745,14 @@ static int dmabuf_imp_release(struct gntdev_dmabuf_priv *priv, u32 fd)
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return 0;
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}
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static void dmabuf_imp_release_all(struct gntdev_dmabuf_priv *priv)
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{
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struct gntdev_dmabuf *q, *gntdev_dmabuf;
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list_for_each_entry_safe(gntdev_dmabuf, q, &priv->imp_list, next)
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dmabuf_imp_release(priv, gntdev_dmabuf->fd);
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}
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/* DMA buffer IOCTL support. */
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long gntdev_ioctl_dmabuf_exp_from_refs(struct gntdev_priv *priv, int use_ptemod,
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@ -862,5 +870,6 @@ struct gntdev_dmabuf_priv *gntdev_dmabuf_init(struct file *filp)
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void gntdev_dmabuf_fini(struct gntdev_dmabuf_priv *priv)
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{
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dmabuf_imp_release_all(priv);
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kfree(priv);
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}
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