Description: zfcp-hbaapi: Fix crash on HBA_FreeLibrary call.
Symptom:     zfcp_ping segmentation fault without any online adapters.
Problem:     Segmentation fault happens on libzfcphbaapi if it build as vendor
             library at this time when SNIA HBAAPI performs dlclose of
             zfcp-hbaapi after clean-up function HBA_FreeLibrary.
             zfcp-hbaapi has missing the event thread clean-up.
Solution:    zfcp-hbaapi event thread cleanup has been coded using
             pthread_cancel and pthread_join in HBA_FreeLibrary function.
Problem-ID:  72524
---
 lib-zfcp-hbaapi-2.1/vlib.c        |   16 ++++++++++++++++
 lib-zfcp-hbaapi-2.1/vlib.h        |    2 ++
 lib-zfcp-hbaapi-2.1/vlib_events.c |    4 +---
 3 files changed, 19 insertions(+), 3 deletions(-)

--- a/lib-zfcp-hbaapi-2.1/vlib.c
+++ b/lib-zfcp-hbaapi-2.1/vlib.c
@@ -169,6 +169,7 @@ HBA_STATUS HBA_LoadLibrary(void)
  */
 HBA_STATUS HBA_FreeLibrary(void)
 {
+	void *res;
 
 	VLIB_MUTEX_LOCK(&vlib_data.mutex);
 	if (!vlib_data.isLoaded) {
@@ -183,6 +184,21 @@ HBA_STATUS HBA_FreeLibrary(void)
 	}
 	vlib_data.unloading = 1;
 
+	if (pthread_cancel(vlib_data.id) != 0) {
+		VLIB_MUTEX_UNLOCK(&vlib_data.mutex);
+		return HBA_STATUS_ERROR;
+	}
+
+	if (pthread_join(vlib_data.id, &res) != 0) {
+		VLIB_MUTEX_UNLOCK(&vlib_data.mutex);
+		return HBA_STATUS_ERROR;
+	}
+
+	if (res != PTHREAD_CANCELED) {
+		VLIB_MUTEX_UNLOCK(&vlib_data.mutex);
+		return HBA_STATUS_ERROR;
+	}
+
 	closeAllAdapters();
 
 	vlib_data.isLoaded = 0;
--- a/lib-zfcp-hbaapi-2.1/vlib.h
+++ b/lib-zfcp-hbaapi-2.1/vlib.h
@@ -494,6 +494,8 @@ struct vlib_data {
 	struct block adapters;		/**< @brief List of adapters
 					   In fact this is the anchor of
 					   the library's repository. */
+	pthread_t id;			/**< @brief Pthread ID of event
+					   handling thread*/
 	pthread_mutex_t mutex;		/**< @brief Protects this structure */
 };
 
--- a/lib-zfcp-hbaapi-2.1/vlib_events.c
+++ b/lib-zfcp-hbaapi-2.1/vlib_events.c
@@ -241,7 +241,5 @@ void cleanup_event_thread()
 
 void start_event_thread()
 {
-	pthread_t id;
-
-	pthread_create(&id, NULL, &establish_listener, NULL);
+	pthread_create(&vlib_data.id, NULL, &establish_listener, NULL);
 }