cvs commit: src/sys/dev/uart uart_bus.h uart_core.c uart_dev_i8251.c uart_dev_ns8250.c uart_dev_sab82532.c uart_dev_z8530.c uart_if.m

[Marcel Moolenaar]

marcel      2003/09/16 18:41:21 PDT

  FreeBSD src repository

  Modified files:
    sys/dev/uart         uart_bus.h uart_core.c uart_dev_i8251.c 
                         uart_dev_ns8250.c uart_dev_sab82532.c 
                         uart_dev_z8530.c uart_if.m 
  Log:
  Add locking to the hardware drivers. I intended to figure out more
  precisely where locking would be needed before adding it, but it
  seems uart(4) draws slightly too much attention to have it without
  locking for too long.
  The lock added is a spinlock that protects access to the underlying
  hardware. As a first and obvious stab at this, each method of the
  hardware interface grabs the lock. Roughly speaking this serializes
  the methods. Exceptions are the probe, attach and detach methods.
  
  Revision  Changes    Path
  1.3       +2 -0      src/sys/dev/uart/uart_bus.h
  1.3       +2 -0      src/sys/dev/uart/uart_core.c
  1.2       +33 -9     src/sys/dev/uart/uart_dev_i8251.c
  1.4       +33 -9     src/sys/dev/uart/uart_dev_ns8250.c
  1.3       +24 -4     src/sys/dev/uart/uart_dev_sab82532.c
  1.3       +20 -5     src/sys/dev/uart/uart_dev_z8530.c
  1.2       +3 -0      src/sys/dev/uart/uart_if.m