[lm-sensors] [RFC/PATCH] hwmon: fix common race conditions, batch 1, v2

[Grant Coady]

On Thu, 20 Mar 2008 09:32:38 -0400, "Mark M. Hoffman" <mhoffman at lightlink.com> wrote:

>Hi all:
>
> adm1026.c |   22 ++++++++++++++--------
> adm1029.c |   30 +++++++++++++++++++-----------
> adm1031.c |   20 +++++++++++++++-----
> adm9240.c |   20 ++++++++++++++------
> adt7470.c |   40 ++++++++++++++++++++++++----------------
> adt7473.c |   54 +++++++++++++++++++++++++++++++-----------------------
> asb100.c  |   16 ++++++++++++----
> 7 files changed, 129 insertions(+), 73 deletions(-)
>
>commit 3c798b55145f42725c54d64ac7d69062a5d62bad
>Author: Mark M. Hoffman <mhoffman at lightlink.com>
>Date:   Mon Mar 3 23:35:52 2008 -0500
>
>    hwmon: fix common race conditions, batch 1
>    
>    Most hwmon drivers have one or more race conditions that could cause the driver
>    to display incorrect data; in the absolute worst case, these races could allow
>    divide-by-zero/OOPS.  The most common of these involves a race between setting
>    a fan divider and displaying the fan data (RPMs).  This patch fixes these race
>    conditions by taking the update lock (or equivalent) as necessary.
>    
>    Signed-off-by: Mark M. Hoffman <mhoffman at lightlink.com>

adm9240 tested on 2.6.25-rc6 and lm-sensors 3.0.0, no problems noticed, 
no observed breakage ;)  I doubt there's a possible div0/oops involved.

Grant.