device-tree: nexus7: Add bq27541 battery interface to dts

[cascardo/linux.git] / block / bio.c

diff --git a/block/bio.c b/block/bio.c
index cf75915..f124a0a 100644 (file)
--- a/block/bio.c
+++ b/block/bio.c
@@ -296,13 +296,19 @@ void bio_reset(struct bio *bio)
 }
 EXPORT_SYMBOL(bio_reset);
 
-static void bio_chain_endio(struct bio *bio)
+static struct bio *__bio_chain_endio(struct bio *bio)
 {
        struct bio *parent = bio->bi_private;
 
-       parent->bi_error = bio->bi_error;
-       bio_endio(parent);
+       if (!parent->bi_error)
+               parent->bi_error = bio->bi_error;
        bio_put(bio);
+       return parent;
+}
+
+static void bio_chain_endio(struct bio *bio)
+{
+       bio_endio(__bio_chain_endio(bio));
 }
 
 /*
@@ -1742,29 +1748,25 @@ static inline bool bio_remaining_done(struct bio *bio)
  **/
 void bio_endio(struct bio *bio)
 {
-       while (bio) {
-               if (unlikely(!bio_remaining_done(bio)))
-                       break;
+again:
+       if (!bio_remaining_done(bio))
+               return;
 
-               /*
-                * Need to have a real endio function for chained bios,
-                * otherwise various corner cases will break (like stacking
-                * block devices that save/restore bi_end_io) - however, we want
-                * to avoid unbounded recursion and blowing the stack. Tail call
-                * optimization would handle this, but compiling with frame
-                * pointers also disables gcc's sibling call optimization.
-                */
-               if (bio->bi_end_io == bio_chain_endio) {
-                       struct bio *parent = bio->bi_private;
-                       parent->bi_error = bio->bi_error;
-                       bio_put(bio);
-                       bio = parent;
-               } else {
-                       if (bio->bi_end_io)
-                               bio->bi_end_io(bio);
-                       bio = NULL;
-               }
+       /*
+        * Need to have a real endio function for chained bios, otherwise
+        * various corner cases will break (like stacking block devices that
+        * save/restore bi_end_io) - however, we want to avoid unbounded
+        * recursion and blowing the stack. Tail call optimization would
+        * handle this, but compiling with frame pointers also disables
+        * gcc's sibling call optimization.
+        */
+       if (bio->bi_end_io == bio_chain_endio) {
+               bio = __bio_chain_endio(bio);
+               goto again;
        }
+
+       if (bio->bi_end_io)
+               bio->bi_end_io(bio);
 }
 EXPORT_SYMBOL(bio_endio);