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| author | Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> | 2022-06-13 13:39:05 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-06-27 14:34:45 +0200 |
| commit | f9008285bb69e4713918a665250ab2d356b731ba (patch) | |
| tree | dd37d533edbf6b5fb962959ecc1484054e932903 /Documentation/driver-api | |
| parent | tty: Add closing marker into comment in tty_ldisc.h (diff) | |
| download | linux-f9008285bb69e4713918a665250ab2d356b731ba.tar.xz linux-f9008285bb69e4713918a665250ab2d356b731ba.zip | |
serial: Drop timeout from uart_port
Since commit 31f6bd7fad3b ("serial: Store character timing information
to uart_port"), per frame timing information is available on uart_port.
Uart port's timeout can be derived from frame_time by multiplying with
fifosize.
Most callers of uart_poll_timeout are not made under port's lock. To be
on the safe side, make sure frame_time is only accessed once. As
fifo_size is effectively a constant, it shouldn't cause any issues.
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20220613113905.22962-1-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/driver-api')
| -rw-r--r-- | Documentation/driver-api/serial/driver.rst | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/Documentation/driver-api/serial/driver.rst b/Documentation/driver-api/serial/driver.rst index 7ef83fd3917b..1e7ab4142d49 100644 --- a/Documentation/driver-api/serial/driver.rst +++ b/Documentation/driver-api/serial/driver.rst @@ -422,8 +422,9 @@ Other functions --------------- uart_update_timeout(port,cflag,baud) - Update the FIFO drain timeout, port->timeout, according to the - number of bits, parity, stop bits and baud rate. + Update the frame timing information according to the number of bits, + parity, stop bits and baud rate. The FIFO drain timeout is derived + from the frame timing information. Locking: caller is expected to take port->lock |