Input: handle failures in input_register_device()

[powerpc.git] / mm / filemap.c

diff --git a/mm/filemap.c b/mm/filemap.c
index 1c31b2f..33a28bf 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -66,7 +66,7 @@ generic_file_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
  *
  *  ->mmap_sem
  *    ->i_mmap_lock
- *      ->page_table_lock      (various places, mainly in mmap.c)
+ *      ->page_table_lock or pte_lock  (various, mainly in memory.c)
  *        ->mapping->tree_lock (arch-dependent flush_dcache_mmap_lock)
  *
  *  ->mmap_sem
@@ -86,9 +86,9 @@ generic_file_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
  *    ->anon_vma.lock          (vma_adjust)
  *
  *  ->anon_vma.lock
- *    ->page_table_lock                (anon_vma_prepare and various)
+ *    ->page_table_lock or pte_lock    (anon_vma_prepare and various)
  *
- *  ->page_table_lock
+ *  ->page_table_lock or pte_lock
  *    ->swap_lock              (try_to_unmap_one)
  *    ->private_lock           (try_to_unmap_one)
  *    ->tree_lock              (try_to_unmap_one)
@@ -134,7 +134,7 @@ static int sync_page(void *word)
        struct address_space *mapping;
        struct page *page;
 
-       page = container_of((page_flags_t *)word, struct page, flags);
+       page = container_of((unsigned long *)word, struct page, flags);
 
        /*
         * page_mapping() is being called without PG_locked held.
@@ -152,7 +152,7 @@ static int sync_page(void *word)
         * in the ->sync_page() methods make essential use of the
         * page_mapping(), merely passing the page down to the backing
         * device's unplug functions when it's non-NULL, which in turn
-        * ignore it for all cases but swap, where only page->private is
+        * ignore it for all cases but swap, where only page_private(page) is
         * of interest. When page_mapping() does go NULL, the entire
         * call stack gracefully ignores the page and returns.
         * -- wli
@@ -1030,8 +1030,8 @@ __generic_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
                        desc.error = 0;
                        do_generic_file_read(filp,ppos,&desc,file_read_actor);
                        retval += desc.written;
-                       if (!retval) {
-                               retval = desc.error;
+                       if (desc.error) {
+                               retval = retval ?: desc.error;
                                break;
                        }
                }
@@ -1520,7 +1520,7 @@ repeat:
                        page_cache_release(page);
                        return err;
                }
-       } else {
+       } else if (vma->vm_flags & VM_NONLINEAR) {
                /* No page was found just because we can't read it in now (being
                 * here implies nonblock != 0), but the page may exist, so set
                 * the PTE to fault it in later. */
@@ -1537,6 +1537,7 @@ repeat:
 
        return 0;
 }
+EXPORT_SYMBOL(filemap_populate);
 
 struct vm_operations_struct generic_file_vm_ops = {
        .nopage         = filemap_nopage,
@@ -1555,7 +1556,6 @@ int generic_file_mmap(struct file * file, struct vm_area_struct * vma)
        vma->vm_ops = &generic_file_vm_ops;
        return 0;
 }
-EXPORT_SYMBOL(filemap_populate);
 
 /*
  * This is for filesystems which do not implement ->writepage.