[Xen-devel] [PATCH] xen/vm_event: fix rc check for uninitialized ring

[Juergen Gross <jgross@xxxxxxxx>]

vm_event_claim_slot() returns -EOPNOTSUPP for an uninitialized ring
since commit 15e4dd5e866b43bbc ("common/vm_event: Initialize vm_event
lists on domain creation"), but the callers test for -ENOSYS.

Correct the callers.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 xen/arch/x86/mm/p2m.c | 2 +-
 xen/common/monitor.c  | 2 +-
 xen/common/vm_event.c | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c
index 57c5eeda91..8a9a1153a8 100644
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -1705,7 +1705,7 @@ void p2m_mem_paging_populate(struct domain *d, unsigned 
long gfn_l)
 
     /* We're paging. There should be a ring */
     int rc = vm_event_claim_slot(d, d->vm_event_paging);
-    if ( rc == -ENOSYS )
+    if ( rc == -EOPNOTSUPP )
     {
         gdprintk(XENLOG_ERR, "Domain %hu paging gfn %lx yet no ring "
                              "in place\n", d->domain_id, gfn_l);
diff --git a/xen/common/monitor.c b/xen/common/monitor.c
index cb5f37fdb2..d5c9ff1cbf 100644
--- a/xen/common/monitor.c
+++ b/xen/common/monitor.c
@@ -98,7 +98,7 @@ int monitor_traps(struct vcpu *v, bool sync, 
vm_event_request_t *req)
     {
     case 0:
         break;
-    case -ENOSYS:
+    case -EOPNOTSUPP:
         /*
          * If there was no ring to handle the event, then
          * simply continue executing normally.
diff --git a/xen/common/vm_event.c b/xen/common/vm_event.c
index 6e68be47bc..7b4ebced16 100644
--- a/xen/common/vm_event.c
+++ b/xen/common/vm_event.c
@@ -513,7 +513,7 @@ bool vm_event_check_ring(struct vm_event_domain *ved)
  * this function will always return 0 for a guest.  For a non-guest, we check
  * for space and return -EBUSY if the ring is not available.
  *
- * Return codes: -ENOSYS: the ring is not yet configured
+ * Return codes: -EOPNOTSUPP: the ring is not yet configured
  *               -EBUSY: the ring is busy
  *               0: a spot has been reserved
  *
-- 
2.16.4


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