[net-next 04/12] can: length: can_fd_len2dlc(): make legnth calculation readable again
From: Marc Kleine-Budde <mkl@pengutronix.de>
Date: 2021-01-27 09:28:22
Also in:
netdev
Subsystem:
can network drivers, the rest · Maintainers:
Marc Kleine-Budde, Vincent Mailhol, Linus Torvalds
In commit 652562e5ff06 ("can: length: can_fd_len2dlc(): simplify length
calculcation") the readability of the code degraded and became more error
prone. To counteract this, partially convert that patch and replace open coded
values (of the original code) with proper defines.
Fixes: 652562e5ff06 ("can: length: can_fd_len2dlc(): simplify length calculcation")
Cc: Vincent MAILHOL <redacted>
Link: https://lore.kernel.org/r/20210118201346.79422-1-socketcan@hartkopp.net (local)
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
drivers/net/can/dev/length.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/net/can/dev/length.c b/drivers/net/can/dev/length.c
index d35c4e82314d..b48140b1102e 100644
--- a/drivers/net/can/dev/length.c
+++ b/drivers/net/can/dev/length.c@@ -27,12 +27,17 @@ static const u8 len2dlc[] = { 13, 13, 13, 13, 13, 13, 13, 13, /* 25 - 32 */ 14, 14, 14, 14, 14, 14, 14, 14, /* 33 - 40 */ 14, 14, 14, 14, 14, 14, 14, 14, /* 41 - 48 */ + 15, 15, 15, 15, 15, 15, 15, 15, /* 49 - 56 */ + 15, 15, 15, 15, 15, 15, 15, 15 /* 57 - 64 */ }; /* map the sanitized data length to an appropriate data length code */ u8 can_fd_len2dlc(u8 len) { - if (len >= ARRAY_SIZE(len2dlc)) + /* check for length mapping table size at build time */ + BUILD_BUG_ON(ARRAY_SIZE(len2dlc) != CANFD_MAX_DLEN + 1); + + if (unlikely(len > CANFD_MAX_DLEN)) return CANFD_MAX_DLC; return len2dlc[len];
--
2.29.2