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Subject[PATCH v2 net-next 2/3] net: stmmac: add mutex lock to protect est parameters
Date
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@nxp.com>
---
drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c | 12 +++++++++++-
include/linux/stmmac.h | 1 +
2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
index d7d448c5a72b..b2a276aac724 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;
@@ -836,6 +840,7 @@ 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);
@@ -849,8 +854,10 @@ 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;
+ }

/* Actual FPE register configuration will be done after FPE handshake
* is success.
@@ -859,6 +866,7 @@ 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 +882,11 @@ 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
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