07454911f0
Previously the command completion interrupt would post any pending command immediately before pcib_pcie_hotplug_update() had been run to inspect the current status. Now, the command completion interrupt merely clears the flag and stops the timer assuming that the caller is always going to call pcib_pcie_hotplug_update() to generate the next hotplug command if one is needed. While here, fix a bug for systems with command completion where the old (existing) value was written to the slot control register instead of the new value. This fixes the complaint about a missing hotplug interrupt on my T400. Differential Revision: https://reviews.freebsd.org/D6363
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