[SCSI] libsas: export sas_alloc_task()

Now that isci has added a 3rd open coded user of this functionality just
share the libsas version.

Acked-by: Jack Wang <jack_wang@usish.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 27 insertions, 3 deletions

diff --git a/drivers/scsi/libsas/sas_init.c b/drivers/scsi/libsas/sas_init.c
index 2dc55343f671..dd56ea827665 100644
--- a/drivers/scsi/libsas/sas_init.c
+++ b/drivers/scsi/libsas/sas_init.c
@@ -37,7 +37,32 @@
 
 #include "../scsi_sas_internal.h"
 
-struct kmem_cache *sas_task_cache;
+static struct kmem_cache *sas_task_cache;
+
+struct sas_task *sas_alloc_task(gfp_t flags)
+{
+        struct sas_task *task = kmem_cache_zalloc(sas_task_cache, flags);
+
+        if (task) {
+                INIT_LIST_HEAD(&task->list);
+                spin_lock_init(&task->task_state_lock);
+                task->task_state_flags = SAS_TASK_STATE_PENDING;
+                init_timer(&task->timer);
+                init_completion(&task->completion);
+        }
+
+        return task;
+}
+EXPORT_SYMBOL_GPL(sas_alloc_task);
+
+void sas_free_task(struct sas_task *task)
+{
+        if (task) {
+                BUG_ON(!list_empty(&task->list));
+                kmem_cache_free(sas_task_cache, task);
+        }
+}
+EXPORT_SYMBOL_GPL(sas_free_task);
 
 /*------------ SAS addr hash -----------*/
 void sas_hash_addr(u8 *hashed, const u8 *sas_addr)
@@ -293,8 +318,7 @@ EXPORT_SYMBOL_GPL(sas_domain_release_transport);
 
 static int __init sas_class_init(void)
 {
-        sas_task_cache = kmem_cache_create("sas_task", sizeof(struct sas_task),
-                                           0, SLAB_HWCACHE_ALIGN, NULL);
+        sas_task_cache = KMEM_CACHE(sas_task, SLAB_HWCACHE_ALIGN);
         if (!sas_task_cache)
                 return -ENOMEM;