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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/xen/gntdev-dmabuf.c
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@@ -247,10 +247,9 @@
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 		if (sgt) {
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 			if (gntdev_dmabuf_attach->dir != DMA_NONE)
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-				dma_unmap_sg_attrs(attach->dev, sgt->sgl,
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-						   sgt->nents,
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-						   gntdev_dmabuf_attach->dir,
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-						   DMA_ATTR_SKIP_CPU_SYNC);
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+				dma_unmap_sgtable(attach->dev, sgt,
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+						  gntdev_dmabuf_attach->dir,
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+						  DMA_ATTR_SKIP_CPU_SYNC);
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 			sg_free_table(sgt);
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 		}
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@@ -288,8 +287,8 @@
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 	sgt = dmabuf_pages_to_sgt(gntdev_dmabuf->pages,
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 				  gntdev_dmabuf->nr_pages);
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 	if (!IS_ERR(sgt)) {
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-		if (!dma_map_sg_attrs(attach->dev, sgt->sgl, sgt->nents, dir,
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-				      DMA_ATTR_SKIP_CPU_SYNC)) {
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+		if (dma_map_sgtable(attach->dev, sgt, dir,
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+				    DMA_ATTR_SKIP_CPU_SYNC)) {
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 			sg_free_table(sgt);
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 			kfree(sgt);
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 			sgt = ERR_PTR(-ENOMEM);
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@@ -342,35 +341,12 @@
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 	mutex_unlock(&priv->lock);
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 }
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-static void *dmabuf_exp_ops_kmap(struct dma_buf *dma_buf,
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-				 unsigned long page_num)
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-{
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-	/* Not implemented. */
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-	return NULL;
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-}
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-
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-static void dmabuf_exp_ops_kunmap(struct dma_buf *dma_buf,
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-				  unsigned long page_num, void *addr)
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-{
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-	/* Not implemented. */
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-}
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-
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-static int dmabuf_exp_ops_mmap(struct dma_buf *dma_buf,
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-			       struct vm_area_struct *vma)
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-{
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-	/* Not implemented. */
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-	return 0;
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-}
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-
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 static const struct dma_buf_ops dmabuf_exp_ops =  {
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 	.attach = dmabuf_exp_ops_attach,
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 	.detach = dmabuf_exp_ops_detach,
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 	.map_dma_buf = dmabuf_exp_ops_map_dma_buf,
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 	.unmap_dma_buf = dmabuf_exp_ops_unmap_dma_buf,
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 	.release = dmabuf_exp_ops_release,
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-	.map = dmabuf_exp_ops_kmap,
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-	.unmap = dmabuf_exp_ops_kunmap,
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-	.mmap = dmabuf_exp_ops_mmap,
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 };
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 struct gntdev_dmabuf_export_args {
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@@ -446,7 +422,7 @@
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 {
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 	struct gntdev_grant_map *map;
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-	if (unlikely(count <= 0))
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+	if (unlikely(gntdev_test_page_count(count)))
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 		return ERR_PTR(-EINVAL);
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 	if ((dmabuf_flags & GNTDEV_DMA_FLAG_WC) &&
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@@ -459,11 +435,6 @@
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 	if (!map)
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 		return ERR_PTR(-ENOMEM);
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-	if (unlikely(gntdev_account_mapped_pages(count))) {
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-		pr_debug("can't map %d pages: over limit\n", count);
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-		gntdev_put_map(NULL, map);
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-		return ERR_PTR(-ENOMEM);
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-	}
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 	return map;
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 }
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@@ -661,7 +632,7 @@
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 	/* Now convert sgt to array of pages and check for page validity. */
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 	i = 0;
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-	for_each_sg_page(sgt->sgl, &sg_iter, sgt->nents, 0) {
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+	for_each_sgtable_page(sgt, &sg_iter, 0) {
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 		struct page *page = sg_page_iter_page(&sg_iter);
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 		/*
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 		 * Check if page is valid: this can happen if we are given
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@@ -753,6 +724,14 @@
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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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+
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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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+
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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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@@ -771,7 +750,7 @@
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 	if (copy_from_user(&op, u, sizeof(op)) != 0)
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 		return -EFAULT;
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-	if (unlikely(op.count <= 0))
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+	if (unlikely(gntdev_test_page_count(op.count)))
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 		return -EINVAL;
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 	refs = kcalloc(op.count, sizeof(*refs), GFP_KERNEL);
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@@ -818,7 +797,7 @@
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 	if (copy_from_user(&op, u, sizeof(op)) != 0)
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 		return -EFAULT;
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-	if (unlikely(op.count <= 0))
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+	if (unlikely(gntdev_test_page_count(op.count)))
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 		return -EINVAL;
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 	gntdev_dmabuf = dmabuf_imp_to_refs(priv->dmabuf_priv,
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@@ -870,5 +849,6 @@
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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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 }