[libvirt] [PATCH] nodeinfo: fix nodeGetFreePages when max node is zero

[Jincheng Miao]

In nodeGetFreePages, if startCell is given by '0',
and the max node number is '0' too. The for-loop
wouldn't be executed.
So convert it to while-loop.

Before:
> virsh freepages --cellno 0 --pagesize 4
error: internal error: no suitable info found

After:
> virsh freepages --cellno 0 --pagesize 4
4KiB: 472637

Signed-off-by: Jincheng Miao <jmiao at redhat.com>
---
 src/nodeinfo.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/nodeinfo.c b/src/nodeinfo.c
index 2459922..1fe190a 100644
--- a/src/nodeinfo.c
+++ b/src/nodeinfo.c
@@ -2042,18 +2042,19 @@ nodeGetFreePages(unsigned int npages,
     }
 
     lastCell = MIN(lastCell, startCell + cellCount);
+    cell = startCell;
 
-    for (cell = startCell; cell < lastCell; cell++) {
+    do {
         for (i = 0; i < npages; i++) {
             unsigned int page_size = pages[i];
             unsigned int page_free;
 
-            if (virNumaGetPageInfo(cell, page_size, 0, NULL, &page_free) < 0)
+            if (virNumaGetPageInfo(cell++, page_size, 0, NULL, &page_free) < 0)
                 goto cleanup;
 
             counts[ncounts++] = page_free;
         }
-    }
+    } while (cell < lastCell);
 
     if (!ncounts) {
         virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
-- 
1.9.3