rsxx: Individual workqueues for interruptible events.

Giving all interrupt based events their own workqueue to complete
tasks on. This fixes a bug that would cause creg commands to timeout
if too many are issued at once.

Signed-off-by: Philip J Kelleher <pjk1939@linux.vnet.ibm.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

3 files changed, 27 insertions, 3 deletions

diff --git a/drivers/block/rsxx/core.c b/drivers/block/rsxx/core.c
index 5af21f2db29c..774f810c6a9c 100644
--- a/drivers/block/rsxx/core.c
+++ b/drivers/block/rsxx/core.c
@@ -163,12 +163,13 @@ static irqreturn_t rsxx_isr(int irq, void *pdata)
                 }
 
                 if (isr & CR_INTR_CREG) {
-                        schedule_work(&card->creg_ctrl.done_work);
+                        queue_work(card->creg_ctrl.creg_wq,
+                                   &card->creg_ctrl.done_work);
                         handled++;
                 }
 
                 if (isr & CR_INTR_EVENT) {
-                        schedule_work(&card->event_work);
+                        queue_work(card->event_wq, &card->event_work);
                         rsxx_disable_ier_and_isr(card, CR_INTR_EVENT);
                         handled++;
                 }
@@ -610,7 +611,11 @@ static int rsxx_pci_probe(struct pci_dev *dev,
         }
 
         /************* Setup Processor Command Interface *************/
-        rsxx_creg_setup(card);
+        st = rsxx_creg_setup(card);
+        if (st) {
+                dev_err(CARD_TO_DEV(card), "Failed to setup creg interface.\n");
+                goto failed_creg_setup;
+        }
 
         spin_lock_irq(&card->irq_lock);
         rsxx_enable_ier_and_isr(card, CR_INTR_CREG);
@@ -650,6 +655,12 @@ static int rsxx_pci_probe(struct pci_dev *dev,
         }
 
         /************* Setup Card Event Handler *************/
+        card->event_wq = create_singlethread_workqueue(DRIVER_NAME"_event");
+        if (!card->event_wq) {
+                dev_err(CARD_TO_DEV(card), "Failed card event setup.\n");
+                goto failed_event_handler;
+        }
+
         INIT_WORK(&card->event_work, card_event_handler);
 
         st = rsxx_setup_dev(card);
@@ -688,9 +699,15 @@ static int rsxx_pci_probe(struct pci_dev *dev,
         return 0;
 
 failed_create_dev:
+        destroy_workqueue(card->event_wq);
+        card->event_wq = NULL;
+failed_event_handler:
         rsxx_dma_destroy(card);
 failed_dma_setup:
 failed_compatiblity_check:
+        destroy_workqueue(card->creg_ctrl.creg_wq);
+        card->creg_ctrl.creg_wq = NULL;
+failed_creg_setup:
         spin_lock_irq(&card->irq_lock);
         rsxx_disable_ier_and_isr(card, CR_INTR_ALL);
         spin_unlock_irq(&card->irq_lock);
diff --git a/drivers/block/rsxx/cregs.c b/drivers/block/rsxx/cregs.c
index 4b5c020a0a65..4914464c19fc 100644
--- a/drivers/block/rsxx/cregs.c
+++ b/drivers/block/rsxx/cregs.c
@@ -727,6 +727,11 @@ int rsxx_creg_setup(struct rsxx_cardinfo *card)
 {
         card->creg_ctrl.active_cmd = NULL;
 
+        card->creg_ctrl.creg_wq =
+                        create_singlethread_workqueue(DRIVER_NAME"_creg");
+        if (!card->creg_ctrl.creg_wq)
+                return -ENOMEM;
+
         INIT_WORK(&card->creg_ctrl.done_work, creg_cmd_done);
         mutex_init(&card->creg_ctrl.reset_lock);
         INIT_LIST_HEAD(&card->creg_ctrl.queue);
diff --git a/drivers/block/rsxx/rsxx_priv.h b/drivers/block/rsxx/rsxx_priv.h
index 382e8bf5c03b..0dd62d966772 100644
--- a/drivers/block/rsxx/rsxx_priv.h
+++ b/drivers/block/rsxx/rsxx_priv.h
@@ -134,6 +134,7 @@ struct rsxx_cardinfo {
                 spinlock_t              lock;
                 bool                    active;
                 struct creg_cmd         *active_cmd;
+                struct workqueue_struct *creg_wq;
                 struct work_struct      done_work;
                 struct list_head        queue;
                 unsigned int            q_depth;
@@ -154,6 +155,7 @@ struct rsxx_cardinfo {
                 int buf_len;
         } log;
 
+        struct workqueue_struct *event_wq;
         struct work_struct      event_work;
         unsigned int            state;
         u64                     size8;