linux-kernel - [PATCH 5.15 838/917] net: stmmac: allow a tc-taprio base-time of zero

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Date:   Mon, 15 Nov 2021 18:05:33 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Vladimir Oltean <vladimir.oltean@....com>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 838/917] net: stmmac: allow a tc-taprio base-time of zero

From: Vladimir Oltean <vladimir.oltean@....com>

[ Upstream commit f64ab8e4f368f48afb08ae91928e103d17b235e9 ]

Commit fe28c53ed71d ("net: stmmac: fix taprio configuration when
base_time is in the past") allowed some base time values in the past,
but apparently not all, the base-time value of 0 (Jan 1st 1970) is still
explicitly denied by the driver.

Remove the bogus check.

Fixes: b60189e0392f ("net: stmmac: Integrate EST with TAPRIO scheduler API")
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
Reviewed-by: Kurt Kanzenbach <kurt@...utronix.de>
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 | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
index 8160087ee92f2..1c4ea0b1b845b 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
@@ -786,8 +786,6 @@ static int tc_setup_taprio(struct stmmac_priv *priv,
 		goto disable;
 	if (qopt->num_entries >= dep)
 		return -EINVAL;
-	if (!qopt->base_time)
-		return -ERANGE;
 	if (!qopt->cycle_time)
 		return -ERANGE;
 
-- 
2.33.0