linux-kernel - [PATCH 5.15 127/917] can: mcp251xfd: mcp251xfd_irq(): add missing can_rx_offload_threaded_irq

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Message-Id: <20211115165433.063458753@linuxfoundation.org>
Date:   Mon, 15 Nov 2021 17:53:42 +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, Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH 5.15 127/917] can: mcp251xfd: mcp251xfd_irq(): add missing can_rx_offload_threaded_irq_finish() in case of bus off

From: Marc Kleine-Budde <mkl@...gutronix.de>

commit 691204bd66b34ba982e19988e6eba9f6321dfe6c upstream.

The function can_rx_offload_threaded_irq_finish() is needed to trigger
the NAPI thread to deliver read CAN frames to the networking stack.

This patch adds the missing call to can_rx_offload_threaded_irq_finish()
in case of a bus off, before leaving the interrupt handler to avoid
packet starvation.

Link: https://lore.kernel.org/all/20211106201526.44292-1-mkl@pengutronix.de
Fixes: 30bfec4fec59 ("can: rx-offload: can_rx_offload_threaded_irq_finish(): add new function to be called from threaded interrupt")
Cc: stable@...r.kernel.org
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
+++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
@@ -2290,8 +2290,10 @@ static irqreturn_t mcp251xfd_irq(int irq
 			 * check will fail, too. So leave IRQ handler
 			 * directly.
 			 */
-			if (priv->can.state == CAN_STATE_BUS_OFF)
+			if (priv->can.state == CAN_STATE_BUS_OFF) {
+				can_rx_offload_threaded_irq_finish(&priv->offload);
 				return IRQ_HANDLED;
+			}
 		}
 
 		handled = IRQ_HANDLED;