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author | Andrey Smirnov <andrew.smirnov@gmail.com> | 2018-05-08 14:15:02 -0700 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2018-08-13 09:13:43 +0200 |
commit | 958f0311136b3e47a1ce3093663f74c4ee139558 (patch) | |
tree | 148000c4f2f16563bd696d92eec88ee09124da0f /dts/Bindings/input | |
parent | 1df07fbcdfce7852cf97a0397b20b586248e1226 (diff) | |
download | barebox-958f0311136b3e47a1ce3093663f74c4ee139558.tar.gz barebox-958f0311136b3e47a1ce3093663f74c4ee139558.tar.xz |
serial: lpuart: Avoid division by zero when requested baudrate is
With serdev device support added there's now a corner case where:
1. There is a DT node for a serdev device on one of the UARTs
2. There is no driver that binds against serdev device's compatibility
string
with 1 and 2 being true it is possible to end up in a situation where
a particualr UART has not been initalized to any baudrate when
clock_notifier_call_chain() gets called. This effectively translates
to
set_baudrate(uart, 0);
which for LPUART driver result in a division by zero.
To avoid this problem, convert lpuart_serial_setbaudrate() to treat
zero baudrate as a request to disable the UART. While we are at it add
a BUG_ON() to lpuart_setbrg() to simplify finding any future bugs.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'dts/Bindings/input')
0 files changed, 0 insertions, 0 deletions