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| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2016-03-14 16:16:10 +0100 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2016-03-31 08:58:10 +0200 |
| commit | 4895b1d72117efea48ff51e94a26ce3cbde4d1a1 (patch) | |
| tree | 0b97eb3c2e22d281896a1609394986b5cd2f4b81 /Documentation | |
| parent | serial: doc: Un-document non-existing uart_write_console() (diff) | |
| download | linux-4895b1d72117efea48ff51e94a26ce3cbde4d1a1.tar.xz linux-4895b1d72117efea48ff51e94a26ce3cbde4d1a1.zip | |
serial: doc: Un-document obsolete tmpbuf_sem
uart_info.tmpbuf and uart_info.tmpbuf_sem were removed in v2.6.10, in
full-history-linux commit a797ad7e3ae9cad4 ("[SERIAL] Clean up
serial_core.c write functions.").
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/serial/driver | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/Documentation/serial/driver b/Documentation/serial/driver index e7c6f86ee06f..61d520dea4c6 100644 --- a/Documentation/serial/driver +++ b/Documentation/serial/driver @@ -36,8 +36,7 @@ It is the responsibility of the low level hardware driver to perform the necessary locking using port->lock. There are some exceptions (which are described in the uart_ops listing below.) -There are three locks. A per-port spinlock, a per-port tmpbuf semaphore, -and an overall semaphore. +There are two locks. A per-port spinlock, and an overall semaphore. From the core driver perspective, the port->lock locks the following data: @@ -50,9 +49,6 @@ data: The low level driver is free to use this lock to provide any additional locking. -The core driver uses the info->tmpbuf_sem lock to prevent multi-threaded -access to the info->tmpbuf bouncebuffer used for port writes. - The port_sem semaphore is used to protect against ports being added/ removed or reconfigured at inappropriate times. Since v2.6.27, this semaphore has been the 'mutex' member of the tty_port struct, and |