staging: lustre: llite: fix ll_statahead_thread() problems on failure

When ll_prep_md_op_data() fails, ll_statahead_thread() does not
release reference of sai and parent dentry. It does not wake
up parent thread either. This patch fixes these problems.

Signed-off-by: Li Xi <lixi@ddn.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-5274
Reviewed-on: http://review.whamcloud.com/10940
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/lustre/lustre/llite/statahead.c b/drivers/staging/lustre/lustre/llite/statahead.c
index 4ac0d6a4ea21aba0f8f46831b63a0790b3becba4..016463be0c21a6c2fdf2f1d6433d70929522abf6 100644 (file)
--- a/drivers/staging/lustre/lustre/llite/statahead.c
+++ b/drivers/staging/lustre/lustre/llite/statahead.c
@@ -1050,8 +1050,10 @@ static int ll_statahead_thread(void *arg)
 
        op_data = ll_prep_md_op_data(NULL, dir, dir, NULL, 0, 0,
                                     LUSTRE_OPC_ANY, dir);
-       if (IS_ERR(op_data))
-               return PTR_ERR(op_data);
+       if (IS_ERR(op_data)) {
+               rc = PTR_ERR(op_data);
+               goto out_put;
+       }
 
        op_data->op_max_pages = ll_i2sbi(dir)->ll_md_brw_pages;
 
@@ -1239,7 +1241,9 @@ do_it:
                }
        }
 out:
+       ll_dir_chain_fini(&chain);
        ll_finish_md_op_data(op_data);
+out_put:
        if (sai->sai_agl_valid) {
                spin_lock(&plli->lli_agl_lock);
                thread_set_flags(agl_thread, SVC_STOPPING);
@@ -1255,7 +1259,6 @@ out:
                /* Set agl_thread flags anyway. */
                thread_set_flags(&sai->sai_agl_thread, SVC_STOPPED);
        }
-       ll_dir_chain_fini(&chain);
        spin_lock(&plli->lli_sa_lock);
        if (!list_empty(&sai->sai_entries_received)) {
                thread_set_flags(thread, SVC_STOPPING);
@@ -1272,9 +1275,9 @@ out:
        wake_up(&sai->sai_waitq);
        wake_up(&thread->t_ctl_waitq);
        ll_sai_put(sai);
-       dput(parent);
        CDEBUG(D_READA, "statahead thread stopped: sai %p, parent %pd\n",
               sai, parent);
+       dput(parent);
        return rc;
 }