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authorHoang-Nam Nguyen <hnguyen@linux.vnet.ibm.com>2007-02-28 20:01:02 +0300
committerRoland Dreier <rolandd@cisco.com>2007-03-02 00:04:05 +0300
commit31726798bd8fbef6244b28cf962f4a4c45793dea (patch)
tree78f8067c58e003c639f58cf9fbf89d08e0d85465 /drivers/infiniband/hw/ehca/ehca_classes.h
parenta27cbe878203076247c1b5287f5ab59ed143b560 (diff)
downloadlinux-31726798bd8fbef6244b28cf962f4a4c45793dea.tar.xz
IB/ehca: Fix sync between completion handler and destroy cq
This patch fixes two issues reported by Roland Dreier and Christoph Hellwig: - Mismatched sync/locking between completion handler and destroy cq We introduced a counter nr_events per cq to track number of irq events seen. This counter is incremented when an event queue entry is seen and decremented after completion handler has been called regardless if scaling code is active or not. Note that nr_callbacks tracks number of events assigned to a cpu and both counters can potentially diverge. The sync between running completion handler and destroy cq is done by using the global spin lock ehca_cq_idr_lock. - Replace yield by wait_event on the counter above to become zero. Signed-off-by: Hoang-Nam Nguyen <hnguyen@de.ibm.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband/hw/ehca/ehca_classes.h')
-rw-r--r--drivers/infiniband/hw/ehca/ehca_classes.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/infiniband/hw/ehca/ehca_classes.h b/drivers/infiniband/hw/ehca/ehca_classes.h
index 40404c9e2817..82ded44c6cee 100644
--- a/drivers/infiniband/hw/ehca/ehca_classes.h
+++ b/drivers/infiniband/hw/ehca/ehca_classes.h
@@ -52,6 +52,8 @@ struct ehca_mw;
struct ehca_pd;
struct ehca_av;
+#include <linux/wait.h>
+
#include <rdma/ib_verbs.h>
#include <rdma/ib_user_verbs.h>
@@ -153,7 +155,9 @@ struct ehca_cq {
spinlock_t cb_lock;
struct hlist_head qp_hashtab[QP_HASHTAB_LEN];
struct list_head entry;
- u32 nr_callbacks;
+ u32 nr_callbacks; /* #events assigned to cpu by scaling code */
+ u32 nr_events; /* #events seen */
+ wait_queue_head_t wait_completion;
spinlock_t task_lock;
u32 ownpid;
/* mmap counter for resources mapped into user space */