[PATCH] mtip32xx: fix checks for dma mapping errors

[Alexey Khoroshilov]

exec_drive_taskfile() checks for dma mapping errors by comparison
returned address with zero, while pci_dma_mapping_error() should be used.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshi...@ispras.ru>
---
 drivers/block/mtip32xx/mtip32xx.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/block/mtip32xx/mtip32xx.c 
b/drivers/block/mtip32xx/mtip32xx.c
index 9b180dbbd03c..06390f2a7d85 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -2039,7 +2039,7 @@ static int exec_drive_taskfile(struct driver_data *dd,
                                         outbuf,
                                         taskout,
                                         DMA_TO_DEVICE);
-               if (outbuf_dma == 0) {
+               if (pci_dma_mapping_error(dd->pdev, outbuf_dma)) {
                        err = -ENOMEM;
                        goto abort;
                }
@@ -2056,7 +2056,7 @@ static int exec_drive_taskfile(struct driver_data *dd,
                inbuf_dma = pci_map_single(dd->pdev,
                                         inbuf,
                                         taskin, DMA_FROM_DEVICE);
-               if (inbuf_dma == 0) {
+               if (pci_dma_mapping_error(dd->pdev, inbuf_dma)) {
                        err = -ENOMEM;
                        goto abort;
                }
-- 
1.9.1