1 files changed, 4 insertions, 1 deletions

diff --git a/mm/filemap_xip.c b/mm/filemap_xip.c
index 5b9ec47ea25a..b5167dfb2f2d 100644
--- a/mm/filemap_xip.c
+++ b/mm/filemap_xip.c
@@ -248,15 +248,16 @@ again:
                 int err;
 
                 /* maybe shared writable, allocate new block */
+                mutex_lock(&xip_sparse_mutex);
                 error = mapping->a_ops->get_xip_mem(mapping, vmf->pgoff, 1,
                                                         &xip_mem, &xip_pfn);
+                mutex_unlock(&xip_sparse_mutex);
                 if (error)
                         return VM_FAULT_SIGBUS;
                 /* unmap sparse mappings at pgoff from all other vmas */
                 __xip_unmap(mapping, vmf->pgoff);
 
 found:
-                printk("%s insert %lx@%lx\n", current->comm, (unsigned long)vmf->virtual_address, xip_pfn);
                 err = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address,
                                                         xip_pfn);
                 if (err == -ENOMEM)
@@ -340,8 +341,10 @@ __xip_file_write(struct file *filp, const char __user *buf,
                                                 &xip_mem, &xip_pfn);
                 if (status == -ENODATA) {
                         /* we allocate a new page unmap it */
+                        mutex_lock(&xip_sparse_mutex);
                         status = a_ops->get_xip_mem(mapping, index, 1,
                                                         &xip_mem, &xip_pfn);
+                        mutex_unlock(&xip_sparse_mutex);
                         if (!status)
                                 /* unmap page at pgoff from all other vmas */
                                 __xip_unmap(mapping, index);