linux-kernel - [PATCH 5.10 047/103] net: stmmac: add mutex lock to protect est parameters

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Date:   Wed,  1 Sep 2021 14:27:57 +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, Xiaoliang Yang <xiaoliang.yang_1@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 047/103] net: stmmac: add mutex lock to protect est parameters

From: Xiaoliang Yang <xiaoliang.yang_1@....com>

[ Upstream commit b2aae654a4794ef898ad33a179f341eb610f6b85 ]

Add a mutex lock to protect est structure parameters so that the
EST parameters can be updated by other threads.

Signed-off-by: Xiaoliang Yang <xiaoliang.yang_1@....com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c | 13 ++++++++++++-
 include/linux/stmmac.h                          |  1 +
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
index 40dc14d1415f..8c2eae2a7efd 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
@@ -689,14 +689,18 @@ static int tc_setup_taprio(struct stmmac_priv *priv,
 					 GFP_KERNEL);
 		if (!plat->est)
 			return -ENOMEM;
+
+		mutex_init(&priv->plat->est->lock);
 	} else {
 		memset(plat->est, 0, sizeof(*plat->est));
 	}
 
 	size = qopt->num_entries;
 
+	mutex_lock(&priv->plat->est->lock);
 	priv->plat->est->gcl_size = size;
 	priv->plat->est->enable = qopt->enable;
+	mutex_unlock(&priv->plat->est->lock);
 
 	for (i = 0; i < size; i++) {
 		s64 delta_ns = qopt->entries[i].interval;
@@ -727,6 +731,7 @@ static int tc_setup_taprio(struct stmmac_priv *priv,
 		priv->plat->est->gcl[i] = delta_ns | (gates << wid);
 	}
 
+	mutex_lock(&priv->plat->est->lock);
 	/* Adjust for real system time */
 	priv->ptp_clock_ops.gettime64(&priv->ptp_clock_ops, &current_time);
 	current_time_ns = timespec64_to_ktime(current_time);
@@ -751,8 +756,10 @@ static int tc_setup_taprio(struct stmmac_priv *priv,
 	priv->plat->est->ctr[0] = do_div(ctr, NSEC_PER_SEC);
 	priv->plat->est->ctr[1] = (u32)ctr;
 
-	if (fpe && !priv->dma_cap.fpesel)
+	if (fpe && !priv->dma_cap.fpesel) {
+		mutex_unlock(&priv->plat->est->lock);
 		return -EOPNOTSUPP;
+	}
 
 	ret = stmmac_fpe_configure(priv, priv->ioaddr,
 				   priv->plat->tx_queues_to_use,
@@ -764,6 +771,7 @@ static int tc_setup_taprio(struct stmmac_priv *priv,
 
 	ret = stmmac_est_configure(priv, priv->ioaddr, priv->plat->est,
 				   priv->plat->clk_ptp_rate);
+	mutex_unlock(&priv->plat->est->lock);
 	if (ret) {
 		netdev_err(priv->dev, "failed to configure EST\n");
 		goto disable;
@@ -773,9 +781,12 @@ static int tc_setup_taprio(struct stmmac_priv *priv,
 	return 0;
 
 disable:
+	mutex_lock(&priv->plat->est->lock);
 	priv->plat->est->enable = false;
 	stmmac_est_configure(priv, priv->ioaddr, priv->plat->est,
 			     priv->plat->clk_ptp_rate);
+	mutex_unlock(&priv->plat->est->lock);
+
 	return ret;
 }
 
diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index 15ca6b4167cc..b56e1dedcf2f 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -112,6 +112,7 @@ struct stmmac_axi {
 
 #define EST_GCL		1024
 struct stmmac_est {
+	struct mutex lock;
 	int enable;
 	u32 btr_offset[2];
 	u32 btr[2];
-- 
2.30.2