From: Martin Wilck <mwilck@suse.com>
Subject: scsi: smartpqi: use processor ID for hwqueue for non-mq case 

The out-of-tree smartpqi driver uses this logic to determine the hardware queue for 
a given CPU. Without this patch and without blk-mq, the driver will route all IRQs
to CPU 0 (bsc#1179310)

It is also possible to simply set force_blk_mq=1 for this driver, but that caused
regressions with I/O accounting (bsc#1205397).

Patch-mainline: Never, not needed with recent kernels
Signed-off-by: Martin Wilck <mwilck@suse.com>
References: bsc#1189310, bsc#1205397

---
 drivers/scsi/smartpqi/smartpqi_init.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/scsi/smartpqi/smartpqi_init.c
+++ b/drivers/scsi/smartpqi/smartpqi_init.c
@@ -5308,7 +5308,11 @@ static inline u16 pqi_get_hw_queue(struc
 {
 	u16 hw_queue;
 
-	hw_queue = blk_mq_unique_tag_to_hwq(blk_mq_unique_tag(scmd->request));
+	if (shost_use_blk_mq(scmd->device->host))
+		hw_queue = blk_mq_unique_tag_to_hwq(blk_mq_unique_tag(scmd->request));
+	else
+		hw_queue = smp_processor_id();
+
 	if (hw_queue > ctrl_info->max_hw_queue_index)
 		hw_queue = 0;