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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>
This commit is contained in:
Nick Ewalt 2018-09-17 05:39:05 -07:00 committed by Greg Kroah-Hartman
parent 0eaf57fb61
commit 08b6b28801
1 changed files with 11 additions and 0 deletions
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11
drivers/staging/gasket/gasket_page_table.c
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@ -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;