linux-kernel - [PATCH 4.4 006/105] net/sonic: Use dma_mapping

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Message-Id: <20180701153149.929219646@linuxfoundation.org>
Date:   Sun,  1 Jul 2018 18:01:16 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Finn Thain <fthain@...egraphics.com.au>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.4 006/105] net/sonic: Use dma_mapping_error()

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Finn Thain <fthain@...egraphics.com.au>

[ Upstream commit 26de0b76d9ba3200f09c6cb9d9618bda338be5f7 ]

With CONFIG_DMA_API_DEBUG=y, calling sonic_open() produces the
message, "DMA-API: device driver failed to check map error".
Add the missing dma_mapping_error() call.

Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Signed-off-by: Finn Thain <fthain@...egraphics.com.au>
Acked-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/natsemi/sonic.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/natsemi/sonic.c
+++ b/drivers/net/ethernet/natsemi/sonic.c
@@ -71,7 +71,7 @@ static int sonic_open(struct net_device
 	for (i = 0; i < SONIC_NUM_RRS; i++) {
 		dma_addr_t laddr = dma_map_single(lp->device, skb_put(lp->rx_skb[i], SONIC_RBSIZE),
 		                                  SONIC_RBSIZE, DMA_FROM_DEVICE);
-		if (!laddr) {
+		if (dma_mapping_error(lp->device, laddr)) {
 			while(i > 0) { /* free any that were mapped successfully */
 				i--;
 				dma_unmap_single(lp->device, lp->rx_laddr[i], SONIC_RBSIZE, DMA_FROM_DEVICE);