From 81496b72e9ba1999d4ed7bb7fa407a1edef020a4 Mon Sep 17 00:00:00 2001 From: Heiner Kallweit Date: Thu, 30 Apr 2020 21:59:48 +0200 Subject: [PATCH] r8169: add check for invalid parameter combination in rtl_set_coalesce Realtek provided information about a HW constraint that time limit must not be set to 0 if the frame limit is >0. Add a check for this and reject invalid parameter combinations. Signed-off-by: Heiner Kallweit Signed-off-by: David S. Miller --- drivers/net/ethernet/realtek/r8169_main.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c index 4fe8b1d35b69..aa3e63e031da 100644 --- a/drivers/net/ethernet/realtek/r8169_main.c +++ b/drivers/net/ethernet/realtek/r8169_main.c @@ -1908,6 +1908,11 @@ static int rtl_set_coalesce(struct net_device *dev, struct ethtool_coalesce *ec) if (tx_fr == 1) tx_fr = 0; + /* HW requires time limit to be set if frame limit is set */ + if ((tx_fr && !ec->tx_coalesce_usecs) || + (rx_fr && !ec->rx_coalesce_usecs)) + return -EINVAL; + w |= FIELD_PREP(RTL_COALESCE_TX_FRAMES, DIV_ROUND_UP(tx_fr, 4)); w |= FIELD_PREP(RTL_COALESCE_RX_FRAMES, DIV_ROUND_UP(rx_fr, 4));