xen: fix usage of ENODATA

ENODATA doesn't exist on FreeBSD, so ENODATA errors returned by the
hypervisor are translated to ENOENT.

Also, the error code is returned in errno if the call returns -1, so
compare the error code with the value in errno instead of the value
returned by the function.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: xen-devel@lists.xenproject.org
Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: Anthony Perard <anthony.perard@citrix.com>

diff --git a/xen-hvm.c b/xen-hvm.c
index a2486cfd7ecc321ee2e3719884b35e627b0223b4..91de2e230b1f6227a2f95d30e03fb2f861e1ff85 100644 (file)
--- a/xen-hvm.c
+++ b/xen-hvm.c
@@ -513,11 +513,14 @@ static void xen_sync_dirty_bitmap(XenIOState *state,
                                  start_addr >> TARGET_PAGE_BITS, npages,
                                  bitmap);
     if (rc < 0) {
-        if (rc != -ENODATA) {
+#ifndef ENODATA
+#define ENODATA  ENOENT
+#endif
+        if (errno == ENODATA) {
             memory_region_set_dirty(framebuffer, 0, size);
             DPRINTF("xen: track_dirty_vram failed (0x" TARGET_FMT_plx
                     ", 0x" TARGET_FMT_plx "): %s\n",
-                    start_addr, start_addr + size, strerror(-rc));
+                    start_addr, start_addr + size, strerror(errno));
         }
         return;
     }