Ion currently returns a single sg_table on each dma_map call. This is
incorrect for later usage.
Not-signed-off-by: Laura Abbott <labb...@redhat.com>
---
drivers/staging/android/ion/ion.c | 32 +++++++++++++++++++++++++++++++-
1 file changed, 31 insertions(+), 1 deletion(-)
diff --git a/drivers/staging/android/ion/ion.c
b/drivers/staging/android/ion/ion.c
index 8dd0932..76b874a0 100644
--- a/drivers/staging/android/ion/ion.c
+++ b/drivers/staging/android/ion/ion.c
@@ -795,19 +795,49 @@ void ion_client_destroy(struct ion_client *client)
}
EXPORT_SYMBOL(ion_client_destroy);
+static struct sg_table *dup_sg_table(struct sg_table *table)
+{
+ struct sg_table *new_table;
+ int ret, i;
+ struct scatterlisg *sg, *new_sg;
+
+ new_table = kzalloc(sizeof(*new_table), GFP_KERNEL);
+ if (!new_table)
+ return ERR_PTR(-ENOMEM);
+
+ ret = sg_alloc_table(new_table, table->nents, GFP_KERNEL);
+ if (ret) {
+ kfree(table);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ new_sg = new_table->sgl;
+ for_each_sg(table->sgl, sg, table->nents, i) {
+ memcpy(new_sg, sg, sizeof(*sg));
+ sg->dma_address = 0;
+ new_sg = sg_next(new_sg);
+ }
+
+ return new_table;
+}
+
+
static struct sg_table *ion_map_dma_buf(struct dma_buf_attachment *attachment,
enum dma_data_direction direction)
{
struct dma_buf *dmabuf = attachment->dmabuf;
struct ion_buffer *buffer = dmabuf->priv;
+ struct sg_table *table;
- return buffer->sg_table;
+ return dup_sg_table(buffer->sg_table);
}
static void ion_unmap_dma_buf(struct dma_buf_attachment *attachment,
struct sg_table *table,
enum dma_data_direction direction)
{
+ sg_free_table(table);
+ kfree(table);
}
struct ion_vma_list {
--
2.7.4
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