19 Jan
2026
19 Jan
'26
4:46 p.m.
On Sun, Jan 18, 2026 at 03:29:02PM +0100, Thomas Hellström wrote:
Why would the importer want to verify the exporter's support for revocation? If the exporter doesn't support it, the only consequence would be that invalidate_mappings() would never be called, and that dma_buf_pin() is a NOP. Besides, dma_buf_pin() would not return an error if the exporter doesn't implement the pin() callback?
I think the comment and commit message should be clarified that dma_buf_attachment_is_revoke() is called by the exporter.
The purpose is for the exporter that wants to call move_notify() on a pinned DMABUF to determine if the importer is going to support it.
Jason