tmpfs: fix regression hang in fallocate undo

[uclinux-h8/linux.git] / mm / shmem.c

diff --git a/mm/shmem.c b/mm/shmem.c
index 24463b6..171dee7 100644 (file)
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2225,9 +2225,11 @@ static long shmem_fallocate(struct file *file, int mode, loff_t offset,
                        error = shmem_getpage(inode, index, &page, SGP_FALLOC);
                if (error) {
                        /* Remove the !PageUptodate pages we added */
-                       shmem_undo_range(inode,
-                               (loff_t)start << PAGE_SHIFT,
-                               ((loff_t)index << PAGE_SHIFT) - 1, true);
+                       if (index > start) {
+                               shmem_undo_range(inode,
+                                   (loff_t)start << PAGE_SHIFT,
+                                   ((loff_t)index << PAGE_SHIFT) - 1, true);
+                       }
                        goto undone;
                }