Some arrays may only capable of handling one STPG at a time,
so this patch implements a module option 'sync_stpg' to have
STPGs submitted synchronously.
Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
---
drivers/scsi/device_handler/scsi_dh_alua.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
index 6fcdcd5..525449f 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -73,6 +73,10 @@ static uint optimize_stpg;
module_param(optimize_stpg, uint, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(optimize_stpg, "Allow use of a non-optimized path, rather than sending a STPG, when implicit TPGS is supported (0=No,1=Yes). Default is 0.");
+static uint sync_stpg;
+module_param(sync_stpg, uint, S_IRUGO);
+MODULE_PARM_DESC(sync_stpg, "Issue STPG synchronously (0=No,1=Yes). Default is 0.");
+
static LIST_HEAD(port_group_list);
static DEFINE_SPINLOCK(port_group_lock);
static struct workqueue_struct *kaluad_wq;
@@ -1019,9 +1023,11 @@ static struct scsi_device_handler alua_dh = {
static int __init alua_init(void)
{
- int r;
+ int r, max_active = 0;
- kaluad_wq = alloc_workqueue("kaluad", WQ_MEM_RECLAIM, 0);
+ if (sync_stpg)
+ max_active = 1;
+ kaluad_wq = alloc_workqueue("kaluad", WQ_MEM_RECLAIM, max_active);
if (!kaluad_wq) {
/* Temporary failure, bypass */
return SCSI_DH_DEV_TEMP_BUSY;
--
1.8.5.6
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