[xen stable-4.16] tools/libs/evtchn: don't set errno to negative values

[patchbot@xxxxxxx]

commit 13a29f3756bc4cab96c59f46c3875b483553fb8f
Author:     Juergen Gross <jgross@xxxxxxxx>
AuthorDate: Tue Jun 7 14:00:31 2022 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Jun 7 14:00:31 2022 +0200

    tools/libs/evtchn: don't set errno to negative values
    
    Setting errno to a negative value makes no sense.
    
    Fixes: 6b6500b3cbaa ("tools/libs/evtchn: Add support for restricting a 
handle")
    Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    master commit: 60245b71c1cd001686fa7b7a26869cbcb80d074c
    master date: 2022-04-22 20:39:34 +0100
---
 tools/libs/evtchn/freebsd.c | 2 +-
 tools/libs/evtchn/minios.c  | 2 +-
 tools/libs/evtchn/netbsd.c  | 2 +-
 tools/libs/evtchn/solaris.c | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/libs/evtchn/freebsd.c b/tools/libs/evtchn/freebsd.c
index 7427ab2408..fa17a0f8db 100644
--- a/tools/libs/evtchn/freebsd.c
+++ b/tools/libs/evtchn/freebsd.c
@@ -58,7 +58,7 @@ int osdep_evtchn_close(xenevtchn_handle *xce)
 
 int osdep_evtchn_restrict(xenevtchn_handle *xce, domid_t domid)
 {
-    errno = -EOPNOTSUPP;
+    errno = EOPNOTSUPP;
 
     return -1;
 }
diff --git a/tools/libs/evtchn/minios.c b/tools/libs/evtchn/minios.c
index e5dfdc5ef5..c0bd5429ee 100644
--- a/tools/libs/evtchn/minios.c
+++ b/tools/libs/evtchn/minios.c
@@ -97,7 +97,7 @@ int osdep_evtchn_close(xenevtchn_handle *xce)
 
 int osdep_evtchn_restrict(xenevtchn_handle *xce, domid_t domid)
 {
-    errno = -EOPNOTSUPP;
+    errno = EOPNOTSUPP;
 
     return -1;
 }
diff --git a/tools/libs/evtchn/netbsd.c b/tools/libs/evtchn/netbsd.c
index 1cebc21ffc..56409513bc 100644
--- a/tools/libs/evtchn/netbsd.c
+++ b/tools/libs/evtchn/netbsd.c
@@ -53,7 +53,7 @@ int osdep_evtchn_close(xenevtchn_handle *xce)
 
 int osdep_evtchn_restrict(xenevtchn_handle *xce, domid_t domid)
 {
-    errno = -EOPNOTSUPP;
+    errno = EOPNOTSUPP;
 
     return -1;
 }
diff --git a/tools/libs/evtchn/solaris.c b/tools/libs/evtchn/solaris.c
index df9579df17..beaa772142 100644
--- a/tools/libs/evtchn/solaris.c
+++ b/tools/libs/evtchn/solaris.c
@@ -53,7 +53,7 @@ int osdep_evtchn_close(xenevtchn_handle *xce)
 
 int osdep_evtchn_restrict(xenevtchn_handle *xce, domid_t domid)
 {
-    errno = -EOPNOTSUPP;
+    errno = EOPNOTSUPP;
     return -1;
 }
 
--
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