svn commit: r278321 - head/sys/dev/ipmi

[John Baldwin]

On Friday, February 06, 2015 04:45:11 PM John Baldwin wrote:
> Author: jhb
> Date: Fri Feb  6 16:45:10 2015
> New Revision: 278321
> URL: https://svnweb.freebsd.org/changeset/base/278321
> 
> Log:
>   Use direct hardware access for internal requests for KCS and SMIC.  In
>   particular, updates to the watchdog should no longer sleep.
>   - Add a new IPMI_IO_LOCK for low-level I/O access.  Use this for
>     kcs_polled_request() and smic_polled_request().
>   - Add a new backend callback "ipmi_driver_request" to handle a driver
>     request.  The new callback performs the request sychronously for KCS
>     and SMIC.  SSIF still defers the work to the worker thread since the
>     worker thread sleeps during request processing anyway.
>   - Allocate driver requests on the stack rather than using malloc().
> 
>   Differential Revision:	https://reviews.freebsd.org/D1723
>   Tested by:	scottl
>   MFC after:	2 weeks

I think we should further change this to only allow the watchdog to be used 
with KCS and SMIC so that watchdog requests never sleep.  I think that we 
could then revert r272366 as to my knowledge this was the only watchdog driver 
that could sleep?

-- 
John Baldwin