pci_host_generic:Add pcib_request_feature on ACPI

[andrew]

Summary

In the ACPI attachment add support for the pcib_request_feature method.
This uses the common _OSC handling.

Sponsored by: Arm Ltd

sys/dev/pci/pci_host_generic_acpi.h

#define ERROUT(x)       ERROUT_IOCTL(DIOCGETETHRULE_error, x)
                 if (rule == NULL) {
                         PF_RULES_RUNLOCK();
                         ERROUT(ENOENT);
                 }
                 /* Make sure rule can't go away. */
                 NET_EPOCH_ENTER(et);
                 PF_RULES_RUNLOCK();
                 nvl = pf_keth_rule_to_nveth_rule(rule);
-                if (pf_keth_anchor_nvcopyout(rs, rule, nvl))
+                if (pf_keth_anchor_nvcopyout(rs, rule, nvl)) {
+                        NET_EPOCH_EXIT(et);
                         ERROUT(EBUSY);
+                }
                 NET_EPOCH_EXIT(et);
                 if (nvl == NULL)
                         ERROUT(ENOMEM);
 
                 nvlpacked = nvlist_pack(nvl, &nv->len);
                 if (nvlpacked == NULL)
                         ERROUT(ENOMEM);
 

sys/dev/pci/pci_host_generic_acpi.c

#define ERROUT(x)       ERROUT_IOCTL(DIOCGETETHRULE_error, x)
                 if (rule == NULL) {
                         PF_RULES_RUNLOCK();
                         ERROUT(ENOENT);
                 }
                 /* Make sure rule can't go away. */
                 NET_EPOCH_ENTER(et);
                 PF_RULES_RUNLOCK();
                 nvl = pf_keth_rule_to_nveth_rule(rule);
-                if (pf_keth_anchor_nvcopyout(rs, rule, nvl))
+                if (pf_keth_anchor_nvcopyout(rs, rule, nvl)) {
+                        NET_EPOCH_EXIT(et);
                         ERROUT(EBUSY);
+                }
                 NET_EPOCH_EXIT(et);
                 if (nvl == NULL)
                         ERROUT(ENOMEM);
 
                 nvlpacked = nvlist_pack(nvl, &nv->len);
                 if (nvlpacked == NULL)
                         ERROUT(ENOMEM);