linux-kernel - [PATCH AUTOSEL 4.19 28/66] sh_eth: check sh_eth_cpu

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Message-Id: <20200411231203.25933-28-sashal@kernel.org>
Date:   Sat, 11 Apr 2020 19:11:25 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Chris Brandt <chris.brandt@...esas.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>, netdev@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 28/66] sh_eth: check sh_eth_cpu_data::cexcr when dumping registers

From: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>

[ Upstream commit f75ca32403dbf91e20c275719aab705401b9e718 ]

When adding the sh_eth_cpu_data::cexcr flag I forgot to add the flag
check to  __sh_eth_get_regs(), causing the non-existing RX packet counter
registers to be considered for dumping on  the R7S72100 SoC (the register
offset sanity check has the final say here)...

Fixes: 4c1d45850d5 ("sh_eth: add sh_eth_cpu_data::cexcr flag")
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Tested-by: Chris Brandt <chris.brandt@...esas.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/renesas/sh_eth.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
index 9e735b52b85fb..7d3207d2d6d6d 100644
--- a/drivers/net/ethernet/renesas/sh_eth.c
+++ b/drivers/net/ethernet/renesas/sh_eth.c
@@ -2174,8 +2174,10 @@ static size_t __sh_eth_get_regs(struct net_device *ndev, u32 *buf)
 	add_reg(FRECR);
 	add_reg(TSFRCR);
 	add_reg(TLFRCR);
-	add_reg(CERCR);
-	add_reg(CEECR);
+	if (cd->cexcr) {
+		add_reg(CERCR);
+		add_reg(CEECR);
+	}
 	add_reg(MAFCR);
 	if (cd->rtrate)
 		add_reg(RTRATE);
-- 
2.20.1