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From:   Todd Poynor <toddpoynor@gmail.com>
To:     Rob Springer <rspringer@google.com>,
        John Joseph <jnjoseph@google.com>,
        Ben Chan <benchan@chromium.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org,
        Todd Poynor <toddpoynor@google.com>
Subject: [PATCH 08/16] staging: gasket: page table: use dma_mapping_error for error detection
Date:   Thu,  9 Aug 2018 20:21:03 -0700
Message-Id: <20180810032111.197743-9-toddpoynor@gmail.com>
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From: Todd Poynor <toddpoynor@google.com>

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

Signed-off-by: Todd Poynor <toddpoynor@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