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staging: gasket: page_table: handle failed dma_map_page
Handle dma_map_page failing in gasket_alloc_extended_subtable: free memory, don't add invalid page table entry. Signed-off-by: Nick Ewalt <nicholasewalt@google.com> Signed-off-by: Todd Poynor <toddpoynor@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 11 additions and 0 deletions
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@ -902,6 +902,17 @@ static int gasket_alloc_extended_subtable(struct gasket_page_table *pg_tbl,
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/* Map the page into DMA space. */
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pte->dma_addr = dma_map_page(pg_tbl->device, pte->page, 0, PAGE_SIZE,
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DMA_TO_DEVICE);
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if (dma_mapping_error(pg_tbl->device, pte->dma_addr)) {
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dev_dbg(pg_tbl->device,
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"%s: fail to map page [pfn %lx phys %llx]\n",
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__func__, page_to_pfn(pte->page),
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page_to_phys(pte->page));
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free_page(page_addr);
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vfree(pte->sublevel);
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memset(pte, 0, sizeof(struct gasket_page_table_entry));
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return -ENOMEM;
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}
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/* make the addresses available to the device */
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dma_addr = (pte->dma_addr + pte->offset) | GASKET_VALID_SLOT_FLAG;
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