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Date:   Sun, 20 Sep 2020 21:08:56 -0400
From:   Michael Chan <michael.chan@...adcom.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, kuba@...nel.org
Subject: [PATCH net 3/6] bnxt_en: Protect bnxt_set_eee() and bnxt_set_pauseparam() with mutex.

All changes related to bp->link_info require the protection of the
link_lock mutex.  It's not sufficient to rely just on RTNL.

Fixes: 163e9ef63641 ("bnxt_en: Fix race when modifying pause settings.")
Reviewed-by: Edwin Peer <edwin.peer@...adcom.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 31 +++++++++++++++--------
 1 file changed, 20 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index d092833..6c75101 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -1788,9 +1788,12 @@ static int bnxt_set_pauseparam(struct net_device *dev,
 	if (!BNXT_PHY_CFG_ABLE(bp))
 		return -EOPNOTSUPP;
 
+	mutex_lock(&bp->link_lock);
 	if (epause->autoneg) {
-		if (!(link_info->autoneg & BNXT_AUTONEG_SPEED))
-			return -EINVAL;
+		if (!(link_info->autoneg & BNXT_AUTONEG_SPEED)) {
+			rc = -EINVAL;
+			goto pause_exit;
+		}
 
 		link_info->autoneg |= BNXT_AUTONEG_FLOW_CTRL;
 		if (bp->hwrm_spec_code >= 0x10201)
@@ -1811,11 +1814,11 @@ static int bnxt_set_pauseparam(struct net_device *dev,
 	if (epause->tx_pause)
 		link_info->req_flow_ctrl |= BNXT_LINK_PAUSE_TX;
 
-	if (netif_running(dev)) {
-		mutex_lock(&bp->link_lock);
+	if (netif_running(dev))
 		rc = bnxt_hwrm_set_pause(bp);
-		mutex_unlock(&bp->link_lock);
-	}
+
+pause_exit:
+	mutex_unlock(&bp->link_lock);
 	return rc;
 }
 
@@ -2552,8 +2555,7 @@ static int bnxt_set_eee(struct net_device *dev, struct ethtool_eee *edata)
 	struct bnxt *bp = netdev_priv(dev);
 	struct ethtool_eee *eee = &bp->eee;
 	struct bnxt_link_info *link_info = &bp->link_info;
-	u32 advertising =
-		 _bnxt_fw_to_ethtool_adv_spds(link_info->advertising, 0);
+	u32 advertising;
 	int rc = 0;
 
 	if (!BNXT_PHY_CFG_ABLE(bp))
@@ -2562,19 +2564,23 @@ static int bnxt_set_eee(struct net_device *dev, struct ethtool_eee *edata)
 	if (!(bp->flags & BNXT_FLAG_EEE_CAP))
 		return -EOPNOTSUPP;
 
+	mutex_lock(&bp->link_lock);
+	advertising = _bnxt_fw_to_ethtool_adv_spds(link_info->advertising, 0);
 	if (!edata->eee_enabled)
 		goto eee_ok;
 
 	if (!(link_info->autoneg & BNXT_AUTONEG_SPEED)) {
 		netdev_warn(dev, "EEE requires autoneg\n");
-		return -EINVAL;
+		rc = -EINVAL;
+		goto eee_exit;
 	}
 	if (edata->tx_lpi_enabled) {
 		if (bp->lpi_tmr_hi && (edata->tx_lpi_timer > bp->lpi_tmr_hi ||
 				       edata->tx_lpi_timer < bp->lpi_tmr_lo)) {
 			netdev_warn(dev, "Valid LPI timer range is %d and %d microsecs\n",
 				    bp->lpi_tmr_lo, bp->lpi_tmr_hi);
-			return -EINVAL;
+			rc = -EINVAL;
+			goto eee_exit;
 		} else if (!bp->lpi_tmr_hi) {
 			edata->tx_lpi_timer = eee->tx_lpi_timer;
 		}
@@ -2584,7 +2590,8 @@ static int bnxt_set_eee(struct net_device *dev, struct ethtool_eee *edata)
 	} else if (edata->advertised & ~advertising) {
 		netdev_warn(dev, "EEE advertised %x must be a subset of autoneg advertised speeds %x\n",
 			    edata->advertised, advertising);
-		return -EINVAL;
+		rc = -EINVAL;
+		goto eee_exit;
 	}
 
 	eee->advertised = edata->advertised;
@@ -2596,6 +2603,8 @@ static int bnxt_set_eee(struct net_device *dev, struct ethtool_eee *edata)
 	if (netif_running(dev))
 		rc = bnxt_hwrm_set_link_setting(bp, false, true);
 
+eee_exit:
+	mutex_unlock(&bp->link_lock);
 	return rc;
 }
 
-- 
1.8.3.1

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