linux-kernel - [PATCH 4.4 20/38] can: dev: can_restart(): post buffer from the right context

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Date:   Mon, 23 Nov 2020 13:22:06 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Loris Fauster <loris.fauster@...ontrol.com>,
        Alejandro Concepcion Rodriguez <alejandro@...ro.eu>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 20/38] can: dev: can_restart(): post buffer from the right context

From: Alejandro Concepcion Rodriguez <alejandro@...ro.eu>

[ Upstream commit a1e654070a60d5d4f7cce59c38f4ca790bb79121 ]

netif_rx() is meant to be called from interrupt contexts. can_restart() may be
called by can_restart_work(), which is called from a worqueue, so it may run in
process context. Use netif_rx_ni() instead.

Fixes: 39549eef3587 ("can: CAN Network device driver and Netlink interface")
Co-developed-by: Loris Fauster <loris.fauster@...ontrol.com>
Signed-off-by: Loris Fauster <loris.fauster@...ontrol.com>
Signed-off-by: Alejandro Concepcion Rodriguez <alejandro@...ro.eu>
Link: https://lore.kernel.org/r/4e84162b-fb31-3a73-fa9a-9438b4bd5234@acoro.eu
[mkl: use netif_rx_ni() instead of netif_rx_any_context()]
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/can/dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c
index 9579dae54af29..52110017fd401 100644
--- a/drivers/net/can/dev.c
+++ b/drivers/net/can/dev.c
@@ -525,7 +525,7 @@ static void can_restart(struct net_device *dev)
 	}
 	cf->can_id |= CAN_ERR_RESTARTED;
 
-	netif_rx(skb);
+	netif_rx_ni(skb);
 
 	stats->rx_packets++;
 	stats->rx_bytes += cf->can_dlc;
-- 
2.27.0