[PATCH 1/6] can: dev: make can_change_state() robust to be called with cf == NULL

[Marc Kleine-Budde]

In OOM situations where no skb can be allocated, can_change_state() may
be called with cf == NULL. As this function updates the state and error
statistics it's not an option to skip the call to can_change_state() in
OOM situations.

This patch makes can_change_state() robust, so that it can be called
with cf == NULL.

Signed-off-by: Marc Kleine-Budde <m...@pengutronix.de>
---
 drivers/net/can/dev.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c
index 611d16a7061d..ae4ed03dc642 100644
--- a/drivers/net/can/dev.c
+++ b/drivers/net/can/dev.c
@@ -391,6 +391,9 @@ void can_change_state(struct net_device *dev, struct 
can_frame *cf,
        can_update_state_error_stats(dev, new_state);
        priv->state = new_state;
 
+       if (!cf)
+               return;
+
        if (unlikely(new_state == CAN_STATE_BUS_OFF)) {
                cf->can_id |= CAN_ERR_BUSOFF;
                return;
-- 
2.11.0