# \[PATCH net 3/4\] can: m\_can: make custom bittiming fields const

- From: Matthias Schiffer \<hidden\>
- Date: 2021-11-15 09:21:39 
- List: netdev
- Page: https://ratatoskr.run/netdev/2021/11/1571970
- Thread: https://ratatoskr.run/linux-can/2021/11/1571967/t.md

```text
The assigned timing structs will be defined a const anyway, so we can
avoid a few casts by declaring the struct fields as const as well.

Signed-off-by: Matthias Schiffer <redacted>
---
 drivers/net/can/m_can/m_can.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/can/m_can/m_can.h b/drivers/net/can/m_can/m_can.h
index ad063b101411..2c5d40997168 100644
--- a/drivers/net/can/m_can/m_can.h
+++ b/drivers/net/can/m_can/m_can.h
@@ -85,8 +85,8 @@ struct m_can_classdev {
 	struct sk_buff *tx_skb;
 	struct phy *transceiver;
 
-	struct can_bittiming_const *bit_timing;
-	struct can_bittiming_const *data_timing;
+	const struct can_bittiming_const *bit_timing;
+	const struct can_bittiming_const *data_timing;
 
 	struct m_can_ops *ops;
 
-- 
2.17.1

```