kernel: bgmac: backport 3 remaining small fixes

This makes bgmac in sync with upstream verison.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

target/linux/generic/patches-4.4/076-0001-net-ethernet-bgmac-Fix-return-value-check-in-bgmac_p.patch

@@ -0,0 +1,26 @@
+From 12c2e32f14da857b58af281b029d4549d24c3292 Mon Sep 17 00:00:00 2001
+From: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
+Date: Tue, 12 Jul 2016 00:17:28 +0000
+Subject: [PATCH] net: ethernet: bgmac: Fix return value check in bgmac_probe()
+
+In case of error, the function devm_ioremap_resource() returns ERR_PTR()
+and never returns NULL. The NULL test in the return value check should be
+replaced with IS_ERR().
+
+Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ drivers/net/ethernet/broadcom/bgmac-platform.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/drivers/net/ethernet/broadcom/bgmac-platform.c
++++ b/drivers/net/ethernet/broadcom/bgmac-platform.c
+@@ -141,7 +141,7 @@ static int bgmac_probe(struct platform_d
+ 	}
+ 
+ 	bgmac->plat.idm_base = devm_ioremap_resource(&pdev->dev, regs);
+-	if (!bgmac->plat.idm_base) {
++	if (IS_ERR(bgmac->plat.idm_base)) {
+ 		dev_err(&pdev->dev, "Unable to map idm resource\n");
+ 		return PTR_ERR(bgmac->plat.idm_base);
+ 	}

target/linux/generic/patches-4.4/076-0002-net-ethernet-bgmac-Remove-redundant-dev_err-call-in-.patch

@@ -0,0 +1,42 @@
+From ce3a380dddd0cb16cb3d8d947b69657d7646c121 Mon Sep 17 00:00:00 2001
+From: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
+Date: Wed, 13 Jul 2016 12:46:57 +0000
+Subject: [PATCH] net: ethernet: bgmac: Remove redundant dev_err call in
+ bgmac_probe()
+
+There is a error message within devm_ioremap_resource
+already, so remove the dev_err call to avoid redundant
+error message.
+
+Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ drivers/net/ethernet/broadcom/bgmac-platform.c | 8 ++------
+ 1 file changed, 2 insertions(+), 6 deletions(-)
+
+--- a/drivers/net/ethernet/broadcom/bgmac-platform.c
++++ b/drivers/net/ethernet/broadcom/bgmac-platform.c
+@@ -129,10 +129,8 @@ static int bgmac_probe(struct platform_d
+ 	}
+ 
+ 	bgmac->plat.base = devm_ioremap_resource(&pdev->dev, regs);
+-	if (IS_ERR(bgmac->plat.base)) {
+-		dev_err(&pdev->dev, "Unable to map base resource\n");
++	if (IS_ERR(bgmac->plat.base))
+ 		return PTR_ERR(bgmac->plat.base);
+-	}
+ 
+ 	regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "idm_base");
+ 	if (!regs) {
+@@ -141,10 +139,8 @@ static int bgmac_probe(struct platform_d
+ 	}
+ 
+ 	bgmac->plat.idm_base = devm_ioremap_resource(&pdev->dev, regs);
+-	if (IS_ERR(bgmac->plat.idm_base)) {
+-		dev_err(&pdev->dev, "Unable to map idm resource\n");
++	if (IS_ERR(bgmac->plat.idm_base))
+ 		return PTR_ERR(bgmac->plat.idm_base);
+-	}
+ 
+ 	bgmac->read = platform_bgmac_read;
+ 	bgmac->write = platform_bgmac_write;

target/linux/generic/patches-4.4/076-0003-net-bgmac-Fix-infinite-loop-in-bgmac_dma_tx_add.patch

@@ -0,0 +1,27 @@
+From e86663c475d384ab5f46cb5637e9b7ad08c5c505 Mon Sep 17 00:00:00 2001
+From: Florian Fainelli <f.fainelli@gmail.com>
+Date: Fri, 15 Jul 2016 15:42:52 -0700
+Subject: [PATCH] net: bgmac: Fix infinite loop in bgmac_dma_tx_add()
+
+Nothing is decrementing the index "i" while we are cleaning up the
+fragments we could not successful transmit.
+
+Fixes: 9cde94506eacf ("bgmac: implement scatter/gather support")
+Reported-by: coverity (CID 1352048)
+Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ drivers/net/ethernet/broadcom/bgmac.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/drivers/net/ethernet/broadcom/bgmac.c
++++ b/drivers/net/ethernet/broadcom/bgmac.c
+@@ -207,7 +207,7 @@ err_dma:
+ 	dma_unmap_single(dma_dev, slot->dma_addr, skb_headlen(skb),
+ 			 DMA_TO_DEVICE);
+ 
+-	while (i > 0) {
++	while (i-- > 0) {
+ 		int index = (ring->end + i) % BGMAC_TX_RING_SLOTS;
+ 		struct bgmac_slot_info *slot = &ring->slots[index];
+ 		u32 ctl1 = le32_to_cpu(ring->cpu_base[index].ctl1);