FS-Cache: Remove unneeded null checks

fscache_write_op() makes unnecessary checks of the page variable to see if it
is NULL.  It can't be NULL at those points as the kernel would already have
crashed a little higher up where we examined page->index.

Furthermore, unless radix_tree_gang_lookup_tag() can return 1 but no page, a
NULL pointer crash should not be encountered there as we can only get there if
r_t_g_l_t() returned 1.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 16 insertions, 20 deletions

diff --git a/fs/fscache/page.c b/fs/fscache/page.c
index 47aefd376e54..723b889fd219 100644
--- a/fs/fscache/page.c
+++ b/fs/fscache/page.c
@@ -710,30 +710,26 @@ static void fscache_write_op(struct fscache_operation *_op)
                 goto superseded;
         }
 
-        if (page) {
-                radix_tree_tag_set(&cookie->stores, page->index,
-                                   FSCACHE_COOKIE_STORING_TAG);
-                radix_tree_tag_clear(&cookie->stores, page->index,
-                                     FSCACHE_COOKIE_PENDING_TAG);
-        }
+        radix_tree_tag_set(&cookie->stores, page->index,
+                           FSCACHE_COOKIE_STORING_TAG);
+        radix_tree_tag_clear(&cookie->stores, page->index,
+                             FSCACHE_COOKIE_PENDING_TAG);
 
         spin_unlock(&cookie->stores_lock);
         spin_unlock(&object->lock);
 
-        if (page) {
-                fscache_set_op_state(&op->op, "Store");
-                fscache_stat(&fscache_n_store_pages);
-                fscache_stat(&fscache_n_cop_write_page);
-                ret = object->cache->ops->write_page(op, page);
-                fscache_stat_d(&fscache_n_cop_write_page);
-                fscache_set_op_state(&op->op, "EndWrite");
-                fscache_end_page_write(object, page);
-                if (ret < 0) {
-                        fscache_set_op_state(&op->op, "Abort");
-                        fscache_abort_object(object);
-                } else {
-                        fscache_enqueue_operation(&op->op);
-                }
+        fscache_set_op_state(&op->op, "Store");
+        fscache_stat(&fscache_n_store_pages);
+        fscache_stat(&fscache_n_cop_write_page);
+        ret = object->cache->ops->write_page(op, page);
+        fscache_stat_d(&fscache_n_cop_write_page);
+        fscache_set_op_state(&op->op, "EndWrite");
+        fscache_end_page_write(object, page);
+        if (ret < 0) {
+                fscache_set_op_state(&op->op, "Abort");
+                fscache_abort_object(object);
+        } else {
+                fscache_enqueue_operation(&op->op);
         }
 
         _leave("");