linux-kernel - [PATCH 5.4 271/309] net: stmmac: fix a possible endless loop

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Message-Id: <20200210122432.704703244@linuxfoundation.org>
Date:   Mon, 10 Feb 2020 04:33:47 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dejin Zheng <zhengdejin5@...il.com>,
        Vinod Koul <vkoul@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.4 271/309] net: stmmac: fix a possible endless loop

From: Dejin Zheng <zhengdejin5@...il.com>

[ Upstream commit 7d10f0774f9e32aa2f2e012f7fcb312a2ce422b9 ]

It forgot to reduce the value of the variable retry in a while loop
in the ethqos_configure() function. It may cause an endless loop and
without timeout.

Fixes: a7c30e62d4b8 ("net: stmmac: Add driver for Qualcomm ethqos")
Signed-off-by: Dejin Zheng <zhengdejin5@...il.com>
Acked-by: Vinod Koul <vkoul@...nel.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
@@ -413,6 +413,7 @@ static int ethqos_configure(struct qcom_
 			dll_lock = rgmii_readl(ethqos, SDC4_STATUS);
 			if (dll_lock & SDC4_STATUS_DLL_LOCK)
 				break;
+			retry--;
 		} while (retry > 0);
 		if (!retry)
 			dev_err(&ethqos->pdev->dev,