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staging: gasket: page_table: handle failed dma_map_page

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Handle dma_map_page failing in gasket_alloc_extended_subtable.

Change-Id: I082b0d1a44a9a7c749683cda8daea7e0920d55fc
Signed-off-by: Nick Ewalt <nicholasewalt@google.com>
Signed-off-by: Todd Poynor <toddpoynor@google.com>
This commit is contained in:
Leonid Lobachev
2019-09-23 14:06:59 -07:00
parent 85c7608274
commit 35113ccbb5
1 changed files with 16 additions and 0 deletions
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16
gasket_page_table.c
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@@ -909,6 +909,22 @@ 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 %llx "
"[pfn %p phys %p]\n",
__func__,
(unsigned long long)pte->dma_addr,
(void *)page_to_pfn(pte->page),
(void *)page_to_phys(pte->page));
/* clean up */
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;