add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/net/ethernet/renesas/ravb_ptp.c
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@@ -182,6 +182,13 @@
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 	struct net_device *ndev = priv->ndev;
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 	unsigned long flags;
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+	/* Reject requests with unsupported flags */
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+	if (req->flags & ~(PTP_ENABLE_FEATURE |
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+			   PTP_RISING_EDGE |
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+			   PTP_FALLING_EDGE |
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+			   PTP_STRICT_FLAGS))
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+		return -EOPNOTSUPP;
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+
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 	if (req->index)
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 		return -EINVAL;
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@@ -196,7 +203,6 @@
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 		ravb_write(ndev, GIE_PTCS, GIE);
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 	else
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 		ravb_write(ndev, GID_PTCD, GID);
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-	mmiowb();
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 	spin_unlock_irqrestore(&priv->lock, flags);
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 	return 0;
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@@ -211,6 +217,10 @@
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 	struct ravb_ptp_perout *perout;
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 	unsigned long flags;
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 	int error = 0;
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+
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+	/* Reject requests with unsupported flags */
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+	if (req->flags)
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+		return -EOPNOTSUPP;
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 	if (req->index)
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 		return -EINVAL;
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@@ -259,7 +269,6 @@
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 		else
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 			ravb_write(ndev, GID_PTMD0, GID);
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 	}
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-	mmiowb();
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 	spin_unlock_irqrestore(&priv->lock, flags);
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 	return error;
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@@ -331,7 +340,6 @@
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 	spin_lock_irqsave(&priv->lock, flags);
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 	ravb_wait(ndev, GCCR, GCCR_TCR, GCCR_TCR_NOREQ);
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 	ravb_modify(ndev, GCCR, GCCR_TCSS, GCCR_TCSS_ADJGPTP);
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-	mmiowb();
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 	spin_unlock_irqrestore(&priv->lock, flags);
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 	priv->ptp.clock = ptp_clock_register(&priv->ptp.info, &pdev->dev);