linux-kernel - [PATCH v2] net: stmmac: fix a possible endless loop

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Message-Id: <20200206141811.24862-1-zhengdejin5@gmail.com>
Date:   Thu,  6 Feb 2020 22:18:11 +0800
From:   Dejin Zheng <zhengdejin5@...il.com>
To:     vkoul@...nel.org, peppe.cavallaro@...com, joabreu@...opsys.com,
        davem@...emloft.net, mcoquelin.stm32@...il.com,
        niklas.cassel@...aro.org, netdev@...r.kernel.org
Cc:     linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Dejin Zheng <zhengdejin5@...il.com>
Subject: [PATCH v2] net: stmmac: fix a possible endless loop

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>
---

Vinod Koul and David Miller, Thanks for your comments!

V2:
add an appropriate Fixes tag.

 drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
index 7ec895407d23..e0a5fe83d8e0 100644
--- 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_ethqos *ethqos)
 			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,
-- 
2.25.0