linux-kernel - [PATCH net 2/2] net: lan966x: Fix sleep in atomic context when updating MAC table

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Message-ID: <20220125093024.121072-3-horatiu.vultur@microchip.com>
Date:   Tue, 25 Jan 2022 10:30:24 +0100
From:   Horatiu Vultur <horatiu.vultur@...rochip.com>
To:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <UNGLinuxDriver@...rochip.com>, <davem@...emloft.net>,
        <kuba@...nel.org>, <f.fainelli@...il.com>,
        <vivien.didelot@...il.com>, <vladimir.oltean@....com>,
        <andrew@...n.ch>, Horatiu Vultur <horatiu.vultur@...rochip.com>
Subject: [PATCH net 2/2] net: lan966x: Fix sleep in atomic context when updating MAC table

The function lan966x_mac_wait_for_completion is used to poll the status
of the MAC table using the function readx_poll_timeout. The problem with
this function is that is called also from atomic context. Therefore
update the function to use readx_poll_timeout_atomic.

Fixes: f8f233c510bda0 ("net: lan966x: add mactable support")
Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
---
 drivers/net/ethernet/microchip/lan966x/lan966x_mac.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c b/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c
index ca5f1177963d..ce5970bdcc6a 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c
@@ -40,11 +40,12 @@ static int lan966x_mac_wait_for_completion(struct lan966x *lan966x)
 {
 	u32 val;
 
-	return readx_poll_timeout(lan966x_mac_get_status,
-		lan966x, val,
-		(ANA_MACACCESS_MAC_TABLE_CMD_GET(val)) ==
-		MACACCESS_CMD_IDLE,
-		TABLE_UPDATE_SLEEP_US, TABLE_UPDATE_TIMEOUT_US);
+	return readx_poll_timeout_atomic(lan966x_mac_get_status,
+					 lan966x, val,
+					 (ANA_MACACCESS_MAC_TABLE_CMD_GET(val)) ==
+					 MACACCESS_CMD_IDLE,
+					 TABLE_UPDATE_SLEEP_US,
+					 TABLE_UPDATE_TIMEOUT_US);
 }
 
 static void lan966x_mac_select(struct lan966x *lan966x,
-- 
2.33.0