[PATCH 08/16] staging: gasket: page table: use dma_mapping_error for error detection

[Todd Poynor]

From: Todd Poynor <toddpoynor at google.com>

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

Signed-off-by: Todd Poynor <toddpoynor at google.com>
---
 drivers/staging/gasket/gasket_page_table.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/gasket/gasket_page_table.c b/drivers/staging/gasket/gasket_page_table.c
index bd921dc6094de..4d2499269499b 100644
--- 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",
-- 
2.18.0.597.ga71716f1ad-goog