staging: gasket: page_table: handle failed dma_map_page (08b6b288) · Commits · 戴 / test

Handle dma_map_page failing in gasket_alloc_extended_subtable: free memory, don't add invalid page table entry. Signed-off-by:

drivers/staging/gasket/gasket_page_table.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -902,6 +902,17 @@ static int gasket_alloc_extended_subtable(struct gasket_page_table *pg_tbl,
		/* Map the page into DMA space. */
		pte->dma_addr = dma_map_page(pg_tbl->device, pte->page, 0, PAGE_SIZE,
		DMA_TO_DEVICE);
		if (dma_mapping_error(pg_tbl->device, pte->dma_addr)) {
		dev_dbg(pg_tbl->device,
		"%s: fail to map page [pfn %lx phys %llx]\n",
		__func__, page_to_pfn(pte->page),
		page_to_phys(pte->page));

		free_page(page_addr);
		vfree(pte->sublevel);
		memset(pte, 0, sizeof(struct gasket_page_table_entry));
		return -ENOMEM;
		}

		/* make the addresses available to the device */
		dma_addr = (pte->dma_addr + pte->offset) \| GASKET_VALID_SLOT_FLAG;