netdev - [PATCH net 1/2] net: lan966x: Fix sleep in atomic context when injecting frames

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Date:   Tue, 25 Jan 2022 10:30:23 +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 1/2] net: lan966x: Fix sleep in atomic context when injecting frames

On lan966x, when injecting a frame it was polling the register
QS_INJ_STATUS to see if it can continue with the injection of the frame.
The problem was that it was using readx_poll_timeout which could sleep
in atomic context.
This patch fixes this issue by using readx_poll_timeout_atomic.

Fixes: d28d6d2e37d10d ("net: lan966x: add port module support")
Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
---
 drivers/net/ethernet/microchip/lan966x/lan966x_main.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
index 0835be02f62b..42461af80ecb 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
@@ -183,9 +183,9 @@ static int lan966x_port_inj_ready(struct lan966x *lan966x, u8 grp)
 {
 	u32 val;
 
-	return readx_poll_timeout(lan966x_port_inj_status, lan966x, val,
-				  QS_INJ_STATUS_FIFO_RDY_GET(val) & BIT(grp),
-				  READL_SLEEP_US, READL_TIMEOUT_US);
+	return readx_poll_timeout_atomic(lan966x_port_inj_status, lan966x, val,
+					 QS_INJ_STATUS_FIFO_RDY_GET(val) & BIT(grp),
+					 READL_SLEEP_US, READL_TIMEOUT_US);
 }
 
 static int lan966x_port_ifh_xmit(struct sk_buff *skb,
-- 
2.33.0