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>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/infiniband/hw/ehca/ehca_main.c b/drivers/infiniband/hw/ehca/ehca_main.c
index c1835121a82..059da9628bb 100644
--- a/drivers/infiniband/hw/ehca/ehca_main.c
+++ b/drivers/infiniband/hw/ehca/ehca_main.c
@@ -52,7 +52,7 @@
 MODULE_LICENSE("Dual BSD/GPL");
 MODULE_AUTHOR("Christoph Raisch <raisch@de.ibm.com>");
 MODULE_DESCRIPTION("IBM eServer HCA InfiniBand Device Driver");
-MODULE_VERSION("SVNEHCA_0021");
+MODULE_VERSION("SVNEHCA_0022");
 
 int ehca_open_aqp1     = 0;
 int ehca_debug_level   = 0;
@@ -810,7 +810,7 @@ int __init ehca_module_init(void)
         int ret;
 
         printk(KERN_INFO "eHCA Infiniband Device Driver "
-               "(Rel.: SVNEHCA_0021)\n");
+               "(Rel.: SVNEHCA_0022)\n");
         idr_init(&ehca_qp_idr);
         idr_init(&ehca_cq_idr);
         spin_lock_init(&ehca_qp_idr_lock);