netdev - [PATCH v2] r8169: fix invalid register dump

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Message-Id: <1376730263-9352-1-git-send-email-lekensteyn@gmail.com>
Date:	Sat, 17 Aug 2013 11:04:23 +0200
From:	Peter Wu <lekensteyn@...il.com>
To:	netdev@...r.kernel.org
Cc:	nic_swsd <nic_swsd@...ltek.com>,
	Ben Hutchings <bhutchings@...arflare.com>,
	Francois Romieu <romieu@...zoreil.com>, lekensteyn@...il.com
Subject: [PATCH v2] r8169: fix invalid register dump

From: Peter Wu <lekensteyn@...il.com>

For some reason, my PCIe RTL8111E onboard NIC on a GA-Z68X-UD3H-B3
motherboard reads as FFs when reading from MMIO with a block size
larger than 7. Therefore change to reading blocks of four bytes.

Thanks to Francois for a better implementation.

Signed-off-by: Peter Wu <lekensteyn@...il.com>
---
 drivers/net/ethernet/realtek/r8169.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index b5eb419..2943916 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -1897,12 +1897,16 @@ static void rtl8169_get_regs(struct net_device *dev, struct ethtool_regs *regs,
 			     void *p)
 {
 	struct rtl8169_private *tp = netdev_priv(dev);
+	u32 __iomem *data = tp->mmio_addr;
+	u32 *dw = p;
+	int i;
 
 	if (regs->len > R8169_REGS_SIZE)
 		regs->len = R8169_REGS_SIZE;
 
 	rtl_lock_work(tp);
-	memcpy_fromio(p, tp->mmio_addr, regs->len);
+	for (i = regs->len; i > 0; i -= 4)
+		memcpy_fromio(dw++, data++, min(4, i));
 	rtl_unlock_work(tp);
 }
 
-- 
1.8.3.4

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