[lm-sensors] [PATCH v6 0/2] Make all it87 drivers SMP safe

Jarod Wilson jarod at wilsonet.com
Fri Apr 15 23:07:03 CEST 2011


On Apr 14, 2011, at 5:36 PM, Nat Gurumoorthy wrote:

> There are 3 different drivers that touch the it87 hardware registers.
> The 3 drivers have been written independently and access the it87 hardware
> registers assuming they are the only driver accessing it. This change
> attempts to serialize access to the hardware by using
> "request_muxed_region" macro defined by Alan Cox. Call to this macro
> will hold off the requestor if the resource is currently busy.
> The use of the above macro makes it possible to get rid of
> spinlocks in it8712f_wdt.c and it87_wdt.c watchdog drivers.
> This also greatly simplifies the implementation of it87_wdt.c driver.
> 
> 01 - Changes to it87 watchdog driver to use "request_muxed_region"
> drivers/watchdog/it8712f_wdt.c
> drivers/watchdog/it87_wdt.c
> 
> 02 - Chages to hwmon it87 driver to use "request_muxed_region"
> drivers/hwmon/it87.c
> 
> drivers/hwmon/it87.c           |   30 +++++++++++++-
> drivers/watchdog/it8712f_wdt.c |   50 +++++++++++++++++++++---
> drivers/watchdog/it87_wdt.c    |   80 +++++++++++++++++++++------------------
> 3 files changed, 113 insertions(+), 47 deletions(-)

FYI,

$ head -n 4 drivers/media/rc/ite-cir.c
/*
 * Driver for ITE Tech Inc. IT8712F/IT8512 CIR
 *
 * Copyright (C) 2010 Juan Jesús García de Soria <skandalfo at gmail.com>


-- 
Jarod Wilson
jarod at wilsonet.com







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