linux-kernel - [PATCH 4.14 159/183] net: stmmac: discard disabled flags in interrupt status register

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Date:   Wed, 25 Apr 2018 12:36:19 +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, Niklas Cassel <niklas.cassel@...s.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 159/183] net: stmmac: discard disabled flags in interrupt status register

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

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

From: Niklas Cassel <niklas.cassel@...s.com>

[ Upstream commit 1b84ca187510f60f00f4e15255043ce19bb30410 ]

The interrupt status register in both dwmac1000 and dwmac4 ignores
interrupt enable (for dwmac4) / interrupt mask (for dwmac1000).
Therefore, if we want to check only the bits that can actually trigger
an irq, we have to filter the interrupt status register manually.

Commit 0a764db10337 ("stmmac: Discard masked flags in interrupt status
register") fixed this for dwmac1000. Fix the same issue for dwmac4.

Just like commit 0a764db10337 ("stmmac: Discard masked flags in
interrupt status register"), this makes sure that we do not get
spurious link up/link down prints.

Signed-off-by: Niklas Cassel <niklas.cassel@...s.com>
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/stmicro/stmmac/dwmac4_core.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
@@ -562,10 +562,12 @@ static int dwmac4_irq_status(struct mac_
 			     struct stmmac_extra_stats *x)
 {
 	void __iomem *ioaddr = hw->pcsr;
-	u32 intr_status;
+	u32 intr_status = readl(ioaddr + GMAC_INT_STATUS);
+	u32 intr_enable = readl(ioaddr + GMAC_INT_EN);
 	int ret = 0;

-	intr_status = readl(ioaddr + GMAC_INT_STATUS);
+	/* Discard disabled bits */
+	intr_status &= intr_enable;

 	/* Not used events (e.g. MMC interrupts) are not handled. */
 	if ((intr_status & mmc_tx_irq))