staging: gasket: page table: use dma_mapping_error for error detection

gasket_perform_mapping() call dma_mapping_error() to determine if
mapping failed.

Signed-off-by: Todd Poynor <toddpoynor@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/gasket/gasket_page_table.c b/drivers/staging/gasket/gasket_page_table.c
index bd921dc..4d24992 100644 (file)
--- a/drivers/staging/gasket/gasket_page_table.c
+++ b/drivers/staging/gasket/gasket_page_table.c
@@ -493,7 +493,8 @@ static int gasket_perform_mapping(struct gasket_page_table *pg_tbl,
                                (void *)page_to_pfn(page),
                                (unsigned long long)ptes[i].dma_addr);
 
-                       if (ptes[i].dma_addr == -1) {
+                       if (dma_mapping_error(pg_tbl->device,
+                                             ptes[i].dma_addr)) {
                                dev_dbg(pg_tbl->device,
                                        "%s i %d -> fail to map page %llx "
                                        "[pfn %p ohys %p]\n",