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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>
This commit is contained in:
Geert Uytterhoeven 2016-03-14 16:16:10 +01:00 committed by Jonathan Corbet
parent 834392a7d9
commit 4895b1d721
1 changed files with 1 additions and 5 deletions
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6
Documentation/serial/driver
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@ -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