[Skiboot] [PATCH] slw: do SLW timer testing while holding xscom lock

[Stewart Smith]

Stewart Smith <stewart at linux.vnet.ibm.com> writes:
> We add some routines that let a caller get the xscom lock once and
> then do a bunch of xscoms while holding it.
>
> In some situations without this, it could take long enough to get
> the xscom lock that the 1ms timeout would expire and we'd falsely
> think the SLW timer didn't work when in fact it did.
>
> Signed-off-by: Stewart Smith <stewart at linux.vnet.ibm.com>

Merged to master as of a5761fb4585520983716d17fdb33f04891cf0479

Also cherry-picked back to 5.4.x:
[skiboot-5.4.x b1bdd88]

-- 
Stewart Smith
OPAL Architect, IBM.