netdev - [PATCH net-next 8/8] net: mscc: ocelot: fix ineffective WARN_ON() in ocelot

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Message-Id: <20230412124737.2243527-9-vladimir.oltean@nxp.com>
Date:   Wed, 12 Apr 2023 15:47:37 +0300
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     netdev@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        UNGLinuxDriver@...rochip.com,
        Colin Foster <colin.foster@...advantage.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH net-next 8/8] net: mscc: ocelot: fix ineffective WARN_ON() in ocelot_stats.c

Since it is hopefully now clear that, since "last" and "layout[i].reg"
are enum types and not addresses, the existing WARN_ON() is ineffective
in checking that the _addresses_ are sorted in the proper order.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 drivers/net/ethernet/mscc/ocelot_stats.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/mscc/ocelot_stats.c b/drivers/net/ethernet/mscc/ocelot_stats.c
index e82c9d9d0ad3..5c55197c7327 100644
--- a/drivers/net/ethernet/mscc/ocelot_stats.c
+++ b/drivers/net/ethernet/mscc/ocelot_stats.c
@@ -901,6 +901,17 @@ static int ocelot_prepare_stats_regions(struct ocelot *ocelot)
 		if (!layout[i].reg)
 			continue;
 
+		/* enum ocelot_stat must be kept sorted in the same order
+		 * as the addresses behind layout[i].reg in order to have
+		 * efficient bulking
+		 */
+		if (last) {
+			WARN(ocelot->map[SYS][last & REG_MASK] >= ocelot->map[SYS][layout[i].reg & REG_MASK],
+			     "reg 0x%x had address 0x%x but reg 0x%x has address 0x%x, bulking broken!",
+			     last, ocelot->map[SYS][last & REG_MASK],
+			     layout[i].reg, ocelot->map[SYS][layout[i].reg & REG_MASK]);
+		}
+
 		if (region && ocelot->map[SYS][layout[i].reg & REG_MASK] ==
 		    ocelot->map[SYS][last & REG_MASK] + 4) {
 			region->count++;
@@ -910,12 +921,6 @@ static int ocelot_prepare_stats_regions(struct ocelot *ocelot)
 			if (!region)
 				return -ENOMEM;
 
-			/* enum ocelot_stat must be kept sorted in the same
-			 * order as layout[i].reg in order to have efficient
-			 * bulking
-			 */
-			WARN_ON(last >= layout[i].reg);
-
 			region->base = layout[i].reg;
 			region->first_stat = i;
 			region->count = 1;
-- 
2.34.1