michaelh/zephyr
1
0
Fork 0
Code Releases Activity

drivers: can: remove option for configuring CAN-FD max DLC

Browse source 
Remove the Kconfig option for configuring the maximum value of the CAN-FD
Data Length Code in order to ensure standard compliance.

Allowing users to configure the max DLC allows the user to save a number of
bytes per CAN frame in RAM, but it also renders the Zephyr CAN-FD
implementation non-compliant with the CAN-FD standard.

There are no guarantees that a Zephyr CAN-FD node will not receive a CAN
frame with a DLC higher than the Kconfig limit, which opens up for all
sorts of bugs when trying to handle received CAN-FD frames.

Signed-off-by: Henrik Brix Andersen <hebad@vestas.com>
This commit is contained in:
Henrik Brix Andersen 2022-08-12 09:52:18 +02:00 • committed by Fabio Baltieri
commit c11326300f
2 changed files with 3 additions and 25 deletions
Download patch file Download diff file Expand all files Collapse all files

12
drivers/can/Kconfig
View file

@ -54,18 +54,6 @@ config CAN_FD_MODE
help
Enable CAN-FD compatible API
if CAN_FD_MODE
config CANFD_MAX_DLC
int "Max data length code in CAN frames"
range 8 15
default 15
help
Maximum allowed DLC in a CAN frame. This parameter sets the
data buffer size in a CAN frame and is therefore only used to
optimize memory consumption.
endif # CAN_FD_MODE
config CAN_RX_TIMESTAMP
bool "Receiving timestamps"
depends on CAN_HAS_RX_TIMESTAMP