[SCSI] zfcp: create private slab caches to guarantee proper data alignment

[linux-2.6] / drivers / s390 / scsi / zfcp_fsf.c

diff --git a/drivers/s390/scsi/zfcp_fsf.c b/drivers/s390/scsi/zfcp_fsf.c
index ff2eacf5ec8c8bee39177ee799bd96ffc3ca6016..4913ffbb2fc8a5f8f21badd98dece73bbb25eb5b 100644 (file)
--- a/drivers/s390/scsi/zfcp_fsf.c
+++ b/drivers/s390/scsi/zfcp_fsf.c
@@ -100,14 +100,19 @@ zfcp_fsf_req_alloc(mempool_t *pool, int req_flags)
        if (req_flags & ZFCP_REQ_NO_QTCB)
                size = sizeof(struct zfcp_fsf_req);
        else
-               size = sizeof(struct zfcp_fsf_req_pool_element);
+               size = sizeof(struct zfcp_fsf_req_qtcb);
 
-       if (likely(pool != NULL))
+       if (likely(pool))
                ptr = mempool_alloc(pool, GFP_ATOMIC);
-       else
-               ptr = kmalloc(size, GFP_ATOMIC);
+       else {
+               if (req_flags & ZFCP_REQ_NO_QTCB)
+                       ptr = kmalloc(size, GFP_ATOMIC);
+               else
+                       ptr = kmem_cache_alloc(zfcp_data.fsf_req_qtcb_cache,
+                                              SLAB_ATOMIC);
+       }
 
-       if (unlikely(NULL == ptr))
+       if (unlikely(!ptr))
                goto out;
 
        memset(ptr, 0, size);
@@ -115,9 +120,8 @@ zfcp_fsf_req_alloc(mempool_t *pool, int req_flags)
        if (req_flags & ZFCP_REQ_NO_QTCB) {
                fsf_req = (struct zfcp_fsf_req *) ptr;
        } else {
-               fsf_req = &((struct zfcp_fsf_req_pool_element *) ptr)->fsf_req;
-               fsf_req->qtcb =
-                       &((struct zfcp_fsf_req_pool_element *) ptr)->qtcb;
+               fsf_req = &((struct zfcp_fsf_req_qtcb *) ptr)->fsf_req;
+               fsf_req->qtcb = &((struct zfcp_fsf_req_qtcb *) ptr)->qtcb;
        }
 
        fsf_req->pool = pool;
@@ -139,10 +143,17 @@ zfcp_fsf_req_alloc(mempool_t *pool, int req_flags)
 void
 zfcp_fsf_req_free(struct zfcp_fsf_req *fsf_req)
 {
-       if (likely(fsf_req->pool != NULL))
+       if (likely(fsf_req->pool)) {
                mempool_free(fsf_req, fsf_req->pool);
-       else
-               kfree(fsf_req);
+               return;
+       }
+
+       if (fsf_req->qtcb) {
+               kmem_cache_free(zfcp_data.fsf_req_qtcb_cache, fsf_req);
+               return;
+       }
+
+       kfree(fsf_req);
 }
 
 /**