ext4: remove unnecessary call to waitqueue_active()

The usage of waitqueue_active() is not necessary, and introduces (I
believe) a hard-to-hit race.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index aed4096..4fa1d70 100644 (file)
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -70,7 +70,6 @@ static void put_io_page(struct ext4_io_page *io_page)
 void ext4_free_io_end(ext4_io_end_t *io)
 {
        int i;
-       wait_queue_head_t *wq;
 
        BUG_ON(!io);
        if (io->page)
@@ -78,10 +77,8 @@ void ext4_free_io_end(ext4_io_end_t *io)
        for (i = 0; i < io->num_io_pages; i++)
                put_io_page(io->pages[i]);
        io->num_io_pages = 0;
-       wq = ext4_ioend_wq(io->inode);
-       if (atomic_dec_and_test(&EXT4_I(io->inode)->i_ioend_count) &&
-           waitqueue_active(wq))
-               wake_up_all(wq);
+       if (atomic_dec_and_test(&EXT4_I(io->inode)->i_ioend_count))
+               wake_up_all(ext4_ioend_wq(io->inode));
        kmem_cache_free(io_end_cachep, io);
 }
 
@@ -96,7 +93,6 @@ int ext4_end_io_nolock(ext4_io_end_t *io)
        struct inode *inode = io->inode;
        loff_t offset = io->offset;
        ssize_t size = io->size;
-       wait_queue_head_t *wq;
        int ret = 0;
 
        ext4_debug("ext4_end_io_nolock: io 0x%p from inode %lu,list->next 0x%p,"
@@ -121,11 +117,8 @@ int ext4_end_io_nolock(ext4_io_end_t *io)
        if (io->flag & EXT4_IO_END_UNWRITTEN) {
                io->flag &= ~EXT4_IO_END_UNWRITTEN;
                /* Wake up anyone waiting on unwritten extent conversion */
-               wq = ext4_ioend_wq(io->inode);
-               if (atomic_dec_and_test(&EXT4_I(inode)->i_aiodio_unwritten) &&
-                   waitqueue_active(wq)) {
-                       wake_up_all(wq);
-               }
+               if (atomic_dec_and_test(&EXT4_I(inode)->i_aiodio_unwritten))
+                       wake_up_all(ext4_ioend_wq(io->inode));
        }
 
        return ret;