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Message-Id: <200702141741.35444.hnguyen@linux.vnet.ibm.com>
Date: Wed, 14 Feb 2007 17:41:35 +0100
From: Hoang-Nam Nguyen <hnguyen@...ux.vnet.ibm.com>
To: Roland Dreier <rdreier@...co.com>, linux-kernel@...r.kernel.org,
linuxppc-dev@...abs.org, openib-general@...nib.org,
hch@...radead.org
Cc: raisch@...ibm.com, h.carstens@...ibm.com
Subject: [PATCH 2.6.21-rc1 4/5] ehca: replace yield() by wait_for_completion()
Hi,
this patch removes yield() and uses wait_for_completion() in order
to wait for running completion handlers finished before destroying
associated completion queue.
Thanks
Nam
Signed-off-by: Hoang-Nam Nguyen <hnguyen@...ibm.com>
---
ehca_classes.h | 3 +++
ehca_cq.c | 3 ++-
ehca_irq.c | 6 +++++-
3 files changed, 10 insertions(+), 2 deletions(-)
diff -Nurp infiniband_orig/drivers/infiniband/hw/ehca/ehca_classes.h infiniband_work/drivers/infiniband/hw/ehca/ehca_classes.h
--- infiniband_orig/drivers/infiniband/hw/ehca/ehca_classes.h 2007-02-14 13:52:49.000000000 +0100
+++ infiniband_work/drivers/infiniband/hw/ehca/ehca_classes.h 2007-02-14 13:52:06.000000000 +0100
@@ -52,6 +52,8 @@ struct ehca_mw;
struct ehca_pd;
struct ehca_av;
+#include <linux/completion.h>
+
#include <rdma/ib_verbs.h>
#include <rdma/ib_user_verbs.h>
@@ -154,6 +156,7 @@ struct ehca_cq {
struct hlist_head qp_hashtab[QP_HASHTAB_LEN];
struct list_head entry;
u32 nr_callbacks;
+ struct completion zero_callbacks;
spinlock_t task_lock;
u32 ownpid;
/* mmap counter for resources mapped into user space */
diff -Nurp infiniband_orig/drivers/infiniband/hw/ehca/ehca_cq.c infiniband_work/drivers/infiniband/hw/ehca/ehca_cq.c
--- infiniband_orig/drivers/infiniband/hw/ehca/ehca_cq.c 2007-02-14 13:52:49.000000000 +0100
+++ infiniband_work/drivers/infiniband/hw/ehca/ehca_cq.c 2007-02-14 13:52:06.000000000 +0100
@@ -147,6 +147,7 @@ struct ib_cq *ehca_create_cq(struct ib_d
spin_lock_init(&my_cq->spinlock);
spin_lock_init(&my_cq->cb_lock);
spin_lock_init(&my_cq->task_lock);
+ init_completion(&my_cq->zero_callbacks);
my_cq->ownpid = current->tgid;
cq = &my_cq->ib_cq;
@@ -332,7 +333,7 @@ int ehca_destroy_cq(struct ib_cq *cq)
spin_lock_irqsave(&ehca_cq_idr_lock, flags);
while (my_cq->nr_callbacks) {
spin_unlock_irqrestore(&ehca_cq_idr_lock, flags);
- yield();
+ wait_for_completion(&my_cq->zero_callbacks);
spin_lock_irqsave(&ehca_cq_idr_lock, flags);
}
diff -Nurp infiniband_orig/drivers/infiniband/hw/ehca/ehca_irq.c infiniband_work/drivers/infiniband/hw/ehca/ehca_irq.c
--- infiniband_orig/drivers/infiniband/hw/ehca/ehca_irq.c 2007-02-14 13:52:49.000000000 +0100
+++ infiniband_work/drivers/infiniband/hw/ehca/ehca_irq.c 2007-02-14 13:52:06.000000000 +0100
@@ -605,6 +605,7 @@ static void run_comp_task(struct ehca_cp
spin_lock_irqsave(&cct->task_lock, flags);
while (!list_empty(&cct->cq_list)) {
+ int is_complete = 0;
cq = list_entry(cct->cq_list.next, struct ehca_cq, entry);
spin_unlock_irqrestore(&cct->task_lock, flags);
comp_event_callback(cq);
@@ -612,11 +613,14 @@ static void run_comp_task(struct ehca_cp
spin_lock(&cq->task_lock);
cq->nr_callbacks--;
- if (cq->nr_callbacks == 0) {
+ is_complete = (cq->nr_callbacks == 0);
+ if (is_complete) {
list_del_init(cct->cq_list.next);
cct->cq_jobs--;
}
spin_unlock(&cq->task_lock);
+ if (is_complete) /* wake up waiting destroy_cq() */
+ complete(&cq->zero_callbacks);
}
spin_unlock_irqrestore(&cct->task_lock, flags);
-
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