[PATCH 08/16] staging: lustre: open code polling loop instead of using l_wait_event()

[NeilBrown]

Two places that LWI_TIMEOUT_INTERVAL() is used, the outcome is a
simple polling loop that polls every second for some event (with a
limit).

So write a simple loop to make this more apparent.

Signed-off-by: NeilBrown <ne...@suse.com>
---
 drivers/staging/lustre/lustre/llite/llite_lib.c |   11 +++++------
 drivers/staging/lustre/lustre/lov/lov_request.c |   12 +++++-------
 2 files changed, 10 insertions(+), 13 deletions(-)

diff --git a/drivers/staging/lustre/lustre/llite/llite_lib.c 
b/drivers/staging/lustre/lustre/llite/llite_lib.c
index 33dc15e9aebb..f6642fa30428 100644
--- a/drivers/staging/lustre/lustre/llite/llite_lib.c
+++ b/drivers/staging/lustre/lustre/llite/llite_lib.c
@@ -1984,8 +1984,7 @@ void ll_umount_begin(struct super_block *sb)
        struct ll_sb_info *sbi = ll_s2sbi(sb);
        struct obd_device *obd;
        struct obd_ioctl_data *ioc_data;
-       wait_queue_head_t waitq;
-       struct l_wait_info lwi;
+       int cnt = 0;
 
        CDEBUG(D_VFSTRACE, "VFS Op: superblock %p count %d active %d\n", sb,
               sb->s_count, atomic_read(&sb->s_active));
@@ -2021,10 +2020,10 @@ void ll_umount_begin(struct super_block *sb)
         * and then continue. For now, we just periodically checking for vfs
         * to decrement mnt_cnt and hope to finish it within 10sec.
         */
-       init_waitqueue_head(&waitq);
-       lwi = LWI_TIMEOUT_INTERVAL(10 * HZ,
-                                  HZ, NULL, NULL);
-       l_wait_event(waitq, may_umount(sbi->ll_mnt.mnt), &lwi);
+       while (cnt < 10 && !may_umount(sbi->ll_mnt.mnt)) {
+               schedule_timeout_uninterruptible(HZ);
+               cnt ++;
+       }
 
        schedule();
 }
diff --git a/drivers/staging/lustre/lustre/lov/lov_request.c 
b/drivers/staging/lustre/lustre/lov/lov_request.c
index fb3b7a7fa32a..c1e58fcc30b3 100644
--- a/drivers/staging/lustre/lustre/lov/lov_request.c
+++ b/drivers/staging/lustre/lustre/lov/lov_request.c
@@ -99,8 +99,7 @@ static int lov_check_set(struct lov_obd *lov, int idx)
  */
 static int lov_check_and_wait_active(struct lov_obd *lov, int ost_idx)
 {
-       wait_queue_head_t waitq;
-       struct l_wait_info lwi;
+       int cnt = 0;
        struct lov_tgt_desc *tgt;
        int rc = 0;
 
@@ -125,11 +124,10 @@ static int lov_check_and_wait_active(struct lov_obd *lov, 
int ost_idx)
 
        mutex_unlock(&lov->lov_lock);
 
-       init_waitqueue_head(&waitq);
-       lwi = LWI_TIMEOUT_INTERVAL(obd_timeout * HZ,
-                                  HZ, NULL, NULL);
-
-       rc = l_wait_event(waitq, lov_check_set(lov, ost_idx), &lwi);
+       while (cnt < obd_timeout && !lov_check_set(lov, ost_idx)) {
+               schedule_timeout_uninterruptible(HZ);
+               cnt ++;
+       }
        if (tgt->ltd_active)
                return 1;