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-rw-r--r--drivers/xen/gntdev-dmabuf.c12
-rw-r--r--drivers/xen/gntdev-dmabuf.h2
-rw-r--r--drivers/xen/gntdev.c2
3 files changed, 13 insertions, 3 deletions
diff --git a/drivers/xen/gntdev-dmabuf.c b/drivers/xen/gntdev-dmabuf.c
index cba6b586bfbd..d97fcfc5e558 100644
--- a/drivers/xen/gntdev-dmabuf.c
+++ b/drivers/xen/gntdev-dmabuf.c
@@ -80,6 +80,12 @@ struct gntdev_dmabuf_priv {
struct list_head imp_list;
/* This is the lock which protects dma_buf_xxx lists. */
struct mutex lock;
+ /*
+ * We reference this file while exporting dma-bufs, so
+ * the grant device context is not destroyed while there are
+ * external users alive.
+ */
+ struct file *filp;
};
/* DMA buffer export support. */
@@ -311,6 +317,7 @@ static void dmabuf_exp_release(struct kref *kref)
dmabuf_exp_wait_obj_signal(gntdev_dmabuf->priv, gntdev_dmabuf);
list_del(&gntdev_dmabuf->next);
+ fput(gntdev_dmabuf->priv->filp);
kfree(gntdev_dmabuf);
}
@@ -423,6 +430,7 @@ static int dmabuf_exp_from_pages(struct gntdev_dmabuf_export_args *args)
mutex_lock(&args->dmabuf_priv->lock);
list_add(&gntdev_dmabuf->next, &args->dmabuf_priv->exp_list);
mutex_unlock(&args->dmabuf_priv->lock);
+ get_file(gntdev_dmabuf->priv->filp);
return 0;
fail:
@@ -834,7 +842,7 @@ long gntdev_ioctl_dmabuf_imp_release(struct gntdev_priv *priv,
return dmabuf_imp_release(priv->dmabuf_priv, op.fd);
}
-struct gntdev_dmabuf_priv *gntdev_dmabuf_init(void)
+struct gntdev_dmabuf_priv *gntdev_dmabuf_init(struct file *filp)
{
struct gntdev_dmabuf_priv *priv;
@@ -847,6 +855,8 @@ struct gntdev_dmabuf_priv *gntdev_dmabuf_init(void)
INIT_LIST_HEAD(&priv->exp_wait_list);
INIT_LIST_HEAD(&priv->imp_list);
+ priv->filp = filp;
+
return priv;
}
diff --git a/drivers/xen/gntdev-dmabuf.h b/drivers/xen/gntdev-dmabuf.h
index 7220a53d0fc5..3d9b9cf9d5a1 100644
--- a/drivers/xen/gntdev-dmabuf.h
+++ b/drivers/xen/gntdev-dmabuf.h
@@ -14,7 +14,7 @@
struct gntdev_dmabuf_priv;
struct gntdev_priv;
-struct gntdev_dmabuf_priv *gntdev_dmabuf_init(void);
+struct gntdev_dmabuf_priv *gntdev_dmabuf_init(struct file *filp);
void gntdev_dmabuf_fini(struct gntdev_dmabuf_priv *priv);
diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index 5efc5eee9544..7cf9c51318aa 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -600,7 +600,7 @@ static int gntdev_open(struct inode *inode, struct file *flip)
mutex_init(&priv->lock);
#ifdef CONFIG_XEN_GNTDEV_DMABUF
- priv->dmabuf_priv = gntdev_dmabuf_init();
+ priv->dmabuf_priv = gntdev_dmabuf_init(flip);
if (IS_ERR(priv->dmabuf_priv)) {
ret = PTR_ERR(priv->dmabuf_priv);
kfree(priv);