http://defect.opensolaris.org/bz/show_bug.cgi?id=4817
Summary: hpet_isr can deadlock with hpet_deep_idle_config and
hpet_cpr
Classification: Development
Product: power-mgmt
Version: unspecified
Platform: Other
OS/Version: Solaris
Status: NEW
Severity: minor
Priority: P3
Component: c-state
AssignedTo: bill.holler at sun.com
ReportedBy: bill.holler at sun.com
CC: tesla-dev at opensolaris.org
Estimated Hours: 0.0
A deadlock will occur if hpet_isr interrupts hpet_deep_idle_config
or hpet_cpr while they hold hpet_proxy_lock. In the current
implementation hpet_proxy_lock is a spin lock. hpet_isr spins forever
because it has pinned the thread holding hpet_proxy_lock.
Holders of hpet_proxy_lock should disabled interrupts before acquiring
the lock. Another option is to have hpet_isr block on hpet_proxy_lock.
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