[PATCH net v7 4/7] can: rockchip_canfd: disable RX offload on open failure

[Cunhao Lu via B4 Relay]

From: Cunhao Lu <1579567540 at qq.com>

rkcanfd_open() enables RX offload before requesting the IRQ. If
request_irq() fails, the error path leaves the offload enabled. A later
open calls napi_enable() on an already enabled NAPI instance.

Disable RX offload on that error path before stopping the controller and
releasing the runtime PM reference.

Fixes: ff60bfbaf67f ("can: rockchip_canfd: add driver for Rockchip CAN-FD controller")
Cc: stable at vger.kernel.org
Signed-off-by: Cunhao Lu <1579567540 at qq.com>

---
Changes in v7:
- Split the open error cleanup into a separate patch.

Changes in v3:
- Disable RX offload when request_irq() fails during open.
---
 drivers/net/can/rockchip/rockchip_canfd-core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/can/rockchip/rockchip_canfd-core.c b/drivers/net/can/rockchip/rockchip_canfd-core.c
index 59a79fe057e6..d05264605efc 100644
--- a/drivers/net/can/rockchip/rockchip_canfd-core.c
+++ b/drivers/net/can/rockchip/rockchip_canfd-core.c
@@ -747,6 +747,7 @@ static int rkcanfd_open(struct net_device *ndev)
 	return 0;
 
 out_rkcanfd_chip_stop:
+	can_rx_offload_disable(&priv->offload);
 	rkcanfd_chip_stop_sync(priv, CAN_STATE_STOPPED);
 	pm_runtime_put(ndev->dev.parent);
 out_close_candev:

-- 
2.34.1