[Xen-changelog] [xen-unstable] Support for -EAGAIN from xc_gnttab_map_grant_ref.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1261031276 0
# Node ID fe42b16855aa727c36833f19df9ba0e7a163941e
# Parent  c344350672987de3d27f6d0b8ca75e1ac3882e52
Support for -EAGAIN from xc_gnttab_map_grant_ref.

Signed-off-by: Grzegorz Milos <Grzegorz.Milos@xxxxxxxxxx>
---
 tools/libxc/xc_linux.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletion(-)

diff -r c34435067298 -r fe42b16855aa tools/libxc/xc_linux.c
--- a/tools/libxc/xc_linux.c    Thu Dec 17 06:27:56 2009 +0000
+++ b/tools/libxc/xc_linux.c    Thu Dec 17 06:27:56 2009 +0000
@@ -442,13 +442,19 @@ void *xc_gnttab_map_grant_ref(int xcg_ha
     if ( ioctl(xcg_handle, IOCTL_GNTDEV_MAP_GRANT_REF, &map) )
         return NULL;
 
+mmap_again:    
     addr = mmap(NULL, PAGE_SIZE, prot, MAP_SHARED, xcg_handle, map.index);
     if ( addr == MAP_FAILED )
     {
         int saved_errno = errno;
         struct ioctl_gntdev_unmap_grant_ref unmap_grant;
 
-        /* Unmap the driver slots used to store the grant information. */
+        if(saved_errno == EAGAIN)
+        {
+            usleep(1000);
+            goto mmap_again;
+        }
+         /* Unmap the driver slots used to store the grant information. */
         perror("xc_gnttab_map_grant_ref: mmap failed");
         unmap_grant.index = map.index;
         unmap_grant.count = 1;

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