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path: root/drivers/s390/scsi/zfcp_aux.c
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Diffstat (limited to 'drivers/s390/scsi/zfcp_aux.c')
-rw-r--r--drivers/s390/scsi/zfcp_aux.c82
1 files changed, 18 insertions, 64 deletions
diff --git a/drivers/s390/scsi/zfcp_aux.c b/drivers/s390/scsi/zfcp_aux.c
index 94f4d8fe85e0..9cf30d124b9e 100644
--- a/drivers/s390/scsi/zfcp_aux.c
+++ b/drivers/s390/scsi/zfcp_aux.c
@@ -4,7 +4,7 @@
*
* Module interface and handling of zfcp data structures.
*
- * Copyright IBM Corp. 2002, 2013
+ * Copyright IBM Corp. 2002, 2017
*/
/*
@@ -124,6 +124,9 @@ static int __init zfcp_module_init(void)
{
int retval = -ENOMEM;
+ if (zfcp_experimental_dix)
+ pr_warn("DIX is enabled. It is experimental and might cause problems\n");
+
zfcp_fsf_qtcb_cache = zfcp_cache_hw_align("zfcp_fsf_qtcb",
sizeof(struct fsf_qtcb));
if (!zfcp_fsf_qtcb_cache)
@@ -248,43 +251,36 @@ static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
{
- if (adapter->pool.erp_req)
- mempool_destroy(adapter->pool.erp_req);
- if (adapter->pool.scsi_req)
- mempool_destroy(adapter->pool.scsi_req);
- if (adapter->pool.scsi_abort)
- mempool_destroy(adapter->pool.scsi_abort);
- if (adapter->pool.qtcb_pool)
- mempool_destroy(adapter->pool.qtcb_pool);
- if (adapter->pool.status_read_req)
- mempool_destroy(adapter->pool.status_read_req);
- if (adapter->pool.sr_data)
- mempool_destroy(adapter->pool.sr_data);
- if (adapter->pool.gid_pn)
- mempool_destroy(adapter->pool.gid_pn);
+ mempool_destroy(adapter->pool.erp_req);
+ mempool_destroy(adapter->pool.scsi_req);
+ mempool_destroy(adapter->pool.scsi_abort);
+ mempool_destroy(adapter->pool.qtcb_pool);
+ mempool_destroy(adapter->pool.status_read_req);
+ mempool_destroy(adapter->pool.sr_data);
+ mempool_destroy(adapter->pool.gid_pn);
}
/**
* zfcp_status_read_refill - refill the long running status_read_requests
* @adapter: ptr to struct zfcp_adapter for which the buffers should be refilled
*
- * Returns: 0 on success, 1 otherwise
- *
- * if there are 16 or more status_read requests missing an adapter_reopen
- * is triggered
+ * Return:
+ * * 0 on success meaning at least one status read is pending
+ * * 1 if posting failed and not a single status read buffer is pending,
+ * also triggers adapter reopen recovery
*/
int zfcp_status_read_refill(struct zfcp_adapter *adapter)
{
- while (atomic_read(&adapter->stat_miss) > 0)
+ while (atomic_add_unless(&adapter->stat_miss, -1, 0))
if (zfcp_fsf_status_read(adapter->qdio)) {
+ atomic_inc(&adapter->stat_miss); /* undo add -1 */
if (atomic_read(&adapter->stat_miss) >=
adapter->stat_read_buf_num) {
zfcp_erp_adapter_reopen(adapter, 0, "axsref1");
return 1;
}
break;
- } else
- atomic_dec(&adapter->stat_miss);
+ }
return 0;
}
@@ -542,45 +538,3 @@ err_out:
zfcp_ccw_adapter_put(adapter);
return ERR_PTR(retval);
}
-
-/**
- * zfcp_sg_free_table - free memory used by scatterlists
- * @sg: pointer to scatterlist
- * @count: number of scatterlist which are to be free'ed
- * the scatterlist are expected to reference pages always
- */
-void zfcp_sg_free_table(struct scatterlist *sg, int count)
-{
- int i;
-
- for (i = 0; i < count; i++, sg++)
- if (sg)
- free_page((unsigned long) sg_virt(sg));
- else
- break;
-}
-
-/**
- * zfcp_sg_setup_table - init scatterlist and allocate, assign buffers
- * @sg: pointer to struct scatterlist
- * @count: number of scatterlists which should be assigned with buffers
- * of size page
- *
- * Returns: 0 on success, -ENOMEM otherwise
- */
-int zfcp_sg_setup_table(struct scatterlist *sg, int count)
-{
- void *addr;
- int i;
-
- sg_init_table(sg, count);
- for (i = 0; i < count; i++, sg++) {
- addr = (void *) get_zeroed_page(GFP_KERNEL);
- if (!addr) {
- zfcp_sg_free_table(sg, i);
- return -ENOMEM;
- }
- sg_set_buf(sg, addr, PAGE_SIZE);
- }
- return 0;
-}