netdev - [PATCH v1 net-next 2/3] net: stmmac: add mutex lock to protect est parameters

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Date:   Tue,  1 Jun 2021 16:38:12 +0800
From:   Xiaoliang Yang <xiaoliang.yang_1@....com>
To:     davem@...emloft.net, joabreu@...opsys.com, kuba@...nel.org,
        alexandre.torgue@...com, peppe.cavallaro@...com,
        mcoquelin.stm32@...il.com
Cc:     netdev@...r.kernel.org, boon.leong.ong@...el.com,
        weifeng.voon@...el.com, vee.khee.wong@...el.com,
        tee.min.tan@...el.com, mohammad.athari.ismail@...el.com,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        leoyang.li@....com, vladimir.oltean@....com,
        qiangqing.zhang@....com, rui.sousa@....com, mingkai.hu@....com,
        yangbo.lu@....com, xiaoliang.yang_1@....com
Subject: [PATCH v1 net-next 2/3] net: stmmac: add mutex lock to protect est parameters

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>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c | 8 ++++++++
 include/linux/stmmac.h                          | 1 +
 2 files changed, 9 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
index d7d448c5a72b..8e1f9a18ef59 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
@@ -798,14 +798,18 @@ 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;
@@ -842,6 +846,7 @@ static int tc_setup_taprio(struct stmmac_priv *priv,
 	time = stmmac_calc_tas_basetime(qopt->base_time, current_time_ns,
 					qopt->cycle_time);
 
+	mutex_lock(&priv->plat->est->lock);
 	priv->plat->est->btr[0] = (u32)time.tv_nsec;
 	priv->plat->est->btr[1] = (u32)time.tv_sec;
 
@@ -859,6 +864,7 @@ 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;
@@ -874,9 +880,11 @@ 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);
 
 	priv->plat->fpe_cfg->enable = false;
 	stmmac_fpe_configure(priv, priv->ioaddr,
diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index e14a12df381b..c38b65aaf8c2 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -115,6 +115,7 @@ struct stmmac_axi {
 
 #define EST_GCL		1024
 struct stmmac_est {
+	struct mutex lock;
 	int enable;
 	u32 btr_offset[2];
 	u32 btr[2];
-- 
2.17.1