From: green <green>
Date: Fri, 1 Apr 2005 15:00:52 +0000 (+0000)
Subject: b=6000
X-Git-Tag: v1_8_0_110~486^7~75
X-Git-Url: https://git.whamcloud.com/?a=commitdiff_plain;h=c9205c9f3e03b7793ce9d041b0bfced3688dc17d;p=fs%2Flustre-release.git

b=6000
Do not search any VMAs in NULL mm. Fixes NFS exporting problems for HP.
---

diff --git a/lustre/llite/llite_mmap.c b/lustre/llite/llite_mmap.c
index 41438d6..e4d6670 100644
--- a/lustre/llite/llite_mmap.c
+++ b/lustre/llite/llite_mmap.c
@@ -283,6 +283,10 @@ static struct vm_area_struct * our_vma(unsigned long addr, size_t count)
         struct vm_area_struct *vma, *ret = NULL;
         ENTRY;
 
+        /* No MM (e.g. NFS)? No vmas too. */
+        if (!mm)
+                RETURN(NULL);
+
         spin_lock(&mm->page_table_lock);
         for(vma = find_vma(mm, addr);
             vma != NULL && vma->vm_start < (addr + count); vma = vma->vm_next) {