[SCSI] qla2xxx: fix for multiqueue in MISX disabled case

 Fix to accommodate a hardware bug in multiqueue mode that does not
 work properly when acknowledgement of MSIX Interrupts is disabled.

Signed-off-by: Anirban Chakraborty <anirban.chakraborty@qlogic.com>
Signed-off-by: Giridhar Malavali <giridhar.malavali@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 10 insertions, 1 deletions

diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
index bc07d8392ac3..1692a883f4de 100644
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -1928,7 +1928,7 @@ qla24xx_msix_rsp_q(int irq, void *dev_id)
 
         vha = qla25xx_get_host(rsp);
         qla24xx_process_response_queue(vha, rsp);
-        if (!ha->mqenable) {
+        if (!ha->flags.disable_msix_handshake) {
                 WRT_REG_DWORD(&reg->hccr, HCCRX_CLR_RISC_INT);
                 RD_REG_DWORD_RELAXED(&reg->hccr);
         }
@@ -1942,6 +1942,7 @@ qla25xx_msix_rsp_q(int irq, void *dev_id)
 {
         struct qla_hw_data *ha;
         struct rsp_que *rsp;
+        struct device_reg_24xx __iomem *reg;
 
         rsp = (struct rsp_que *) dev_id;
         if (!rsp) {
@@ -1951,6 +1952,14 @@ qla25xx_msix_rsp_q(int irq, void *dev_id)
         }
         ha = rsp->hw;
 
+        /* Clear the interrupt, if enabled, for this response queue */
+        if (rsp->options & ~BIT_6) {
+                reg = &ha->iobase->isp24;
+                spin_lock_irq(&ha->hardware_lock);
+                WRT_REG_DWORD(&reg->hccr, HCCRX_CLR_RISC_INT);
+                RD_REG_DWORD_RELAXED(&reg->hccr);
+                spin_unlock_irq(&ha->hardware_lock);
+        }
         queue_work_on((int) (rsp->id - 1), ha->wq, &rsp->q_work);
 
         return IRQ_HANDLED;