netdev - [PATCH net-next,v3] net: ethernet: mediatek: ppe: fix busy wait loop

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Date:   Thu, 15 Apr 2021 17:37:48 -0700
From:   Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>
To:     Felix Fietkau <nbd@....name>, John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>
Cc:     Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>
Subject: [PATCH net-next,v3] net: ethernet: mediatek: ppe: fix busy wait loop

The intention is for the loop to timeout if the body does not succeed.
The current logic calls time_is_before_jiffies(timeout) which is false
until after the timeout, so the loop body never executes.

Fix by using readl_poll_timeout as a more standard and less error-prone
solution.

Fixes: ba37b7caf1ed ("net: ethernet: mtk_eth_soc: add support for initializing the PPE")
Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>
Cc: Felix Fietkau <nbd@....name>
Reviewed-by: Andrew Lunn <andrew@...n.ch>
---
v2:
  - Use readl_poll_timeout as suggested by Andrew Lunn
v3:
  - Remove unused #include's

 drivers/net/ethernet/mediatek/mtk_ppe.c | 20 +++++++++-----------
 drivers/net/ethernet/mediatek/mtk_ppe.h |  1 +
 2 files changed, 10 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_ppe.c b/drivers/net/ethernet/mediatek/mtk_ppe.c
index 71e1ccea6e72..3ad10c793308 100644
--- a/drivers/net/ethernet/mediatek/mtk_ppe.c
+++ b/drivers/net/ethernet/mediatek/mtk_ppe.c
@@ -2,9 +2,8 @@
 /* Copyright (C) 2020 Felix Fietkau <nbd@....name> */
 
 #include <linux/kernel.h>
-#include <linux/jiffies.h>
-#include <linux/delay.h>
 #include <linux/io.h>
+#include <linux/iopoll.h>
 #include <linux/etherdevice.h>
 #include <linux/platform_device.h>
 #include "mtk_ppe.h"
@@ -44,18 +43,17 @@ static u32 ppe_clear(struct mtk_ppe *ppe, u32 reg, u32 val)
 
 static int mtk_ppe_wait_busy(struct mtk_ppe *ppe)
 {
-	unsigned long timeout = jiffies + HZ;
-
-	while (time_is_before_jiffies(timeout)) {
-		if (!(ppe_r32(ppe, MTK_PPE_GLO_CFG) & MTK_PPE_GLO_CFG_BUSY))
-			return 0;
+	int ret;
+	u32 val;
 
-		usleep_range(10, 20);
-	}
+	ret = readl_poll_timeout(ppe->base + MTK_PPE_GLO_CFG, val,
+				 !(val & MTK_PPE_GLO_CFG_BUSY),
+				 20, MTK_PPE_WAIT_TIMEOUT_US);
 
-	dev_err(ppe->dev, "PPE table busy");
+	if (ret)
+		dev_err(ppe->dev, "PPE table busy");
 
-	return -ETIMEDOUT;
+	return ret;
 }
 
 static void mtk_ppe_cache_clear(struct mtk_ppe *ppe)
diff --git a/drivers/net/ethernet/mediatek/mtk_ppe.h b/drivers/net/ethernet/mediatek/mtk_ppe.h
index 51bd5e75bbbd..242fb8f2ae65 100644
--- a/drivers/net/ethernet/mediatek/mtk_ppe.h
+++ b/drivers/net/ethernet/mediatek/mtk_ppe.h
@@ -12,6 +12,7 @@
 #define MTK_PPE_ENTRIES_SHIFT		3
 #define MTK_PPE_ENTRIES			(1024 << MTK_PPE_ENTRIES_SHIFT)
 #define MTK_PPE_HASH_MASK		(MTK_PPE_ENTRIES - 1)
+#define MTK_PPE_WAIT_TIMEOUT_US		1000000
 
 #define MTK_FOE_IB1_UNBIND_TIMESTAMP	GENMASK(7, 0)
 #define MTK_FOE_IB1_UNBIND_PACKETS	GENMASK(23, 8)
-- 
2.31.1