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can: bittiming: can_sjw_check(): check that SJW is not longer than either Phase Buffer Segment

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According to "The Configuration of the CAN Bit Timing" [1] the SJW
"may not be longer than either Phase Buffer Segment".

Check SJW against length of both Phase buffers. In case the SJW is
greater, report an error via netlink to user space and bail out.

[1] http://web.archive.org/http://www.oertel-halle.de/files/cia99paper.pdf

Link: https://lore.kernel.org/all/20230202110854.2318594-14-mkl@pengutronix.de
Suggested-by: Vincent Mailhol <vincent.mailhol@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Marc Kleine-Budde
2022-09-06 19:15:28 +02:00
parent 0c017f0910
commit b5a3d0864e
1 changed files with 14 additions and 0 deletions
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14
drivers/net/can/dev/bittiming.c
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@@ -24,6 +24,20 @@ int can_sjw_check(const struct net_device *dev, const struct can_bittiming *bt,
return -EINVAL;
}
if (bt->sjw > bt->phase_seg1) {
NL_SET_ERR_MSG_FMT(extack,
"sjw: %u greater than phase-seg1: %u",
bt->sjw, bt->phase_seg1);
return -EINVAL;
}
if (bt->sjw > bt->phase_seg2) {
NL_SET_ERR_MSG_FMT(extack,
"sjw: %u greater than phase-seg2: %u",
bt->sjw, bt->phase_seg2);
return -EINVAL;
}
return 0;
}