HSI: omap_ssi: call msg->complete() from process context

msg->complete() should always be called from process context once
irq_safe runtime pm flag is no longer set for omap-ssi.

Signed-off-by: Sebastian Reichel <sre@kernel.org>
Tested-by: Pavel Machek <pavel@ucw.cz>

3 files changed, 25 insertions, 1 deletions

diff --git a/drivers/hsi/controllers/omap_ssi.h b/drivers/hsi/controllers/omap_ssi.h
index 99143f4f8837..32ced0c8f789 100644
--- a/drivers/hsi/controllers/omap_ssi.h
+++ b/drivers/hsi/controllers/omap_ssi.h
@@ -73,6 +73,8 @@ struct omap_ssm_ctx {
  * @txqueue: TX message queues
  * @rxqueue: RX message queues
  * @brkqueue: Queue of incoming HWBREAK requests (FRAME mode)
+ * @errqueue: Queue for failed messages
+ * @errqueue_work: Delayed Work for failed messages
  * @irq: IRQ number
  * @wake_irq: IRQ number for incoming wake line (-1 if none)
  * @wake_gpio: GPIO number for incoming wake line (-1 if none)
@@ -96,6 +98,8 @@ struct omap_ssi_port {
         struct list_head        txqueue[SSI_MAX_CHANNELS];
         struct list_head        rxqueue[SSI_MAX_CHANNELS];
         struct list_head        brkqueue;
+        struct list_head        errqueue;
+        struct delayed_work     errqueue_work;
         unsigned int            irq;
         int                     wake_irq;
         struct gpio_desc        *wake_gpio;
diff --git a/drivers/hsi/controllers/omap_ssi_core.c b/drivers/hsi/controllers/omap_ssi_core.c
index 79562ce65579..506a9f1ef7ad 100644
--- a/drivers/hsi/controllers/omap_ssi_core.c
+++ b/drivers/hsi/controllers/omap_ssi_core.c
@@ -235,7 +235,9 @@ static void ssi_gdd_complete(struct hsi_controller *ssi, unsigned int lch)
                 spin_lock(&omap_port->lock);
                 list_del(&msg->link); /* Dequeue msg */
                 spin_unlock(&omap_port->lock);
-                msg->complete(msg);
+
+                list_add_tail(&msg->link, &omap_port->errqueue);
+                schedule_delayed_work(&omap_port->errqueue_work, 0);
                 return;
         }
         spin_lock(&omap_port->lock);
diff --git a/drivers/hsi/controllers/omap_ssi_port.c b/drivers/hsi/controllers/omap_ssi_port.c
index f91c6a4bb1a5..7717c769c4dd 100644
--- a/drivers/hsi/controllers/omap_ssi_port.c
+++ b/drivers/hsi/controllers/omap_ssi_port.c
@@ -193,6 +193,21 @@ static int ssi_debug_add_port(struct omap_ssi_port *omap_port,
 }
 #endif
 
+static void ssi_process_errqueue(struct work_struct *work)
+{
+        struct omap_ssi_port *omap_port;
+        struct list_head *head, *tmp;
+        struct hsi_msg *msg;
+
+        omap_port = container_of(work, struct omap_ssi_port, errqueue_work.work);
+
+        list_for_each_safe(head, tmp, &omap_port->errqueue) {
+                msg = list_entry(head, struct hsi_msg, link);
+                msg->complete(msg);
+                list_del(head);
+        }
+}
+
 static int ssi_claim_lch(struct hsi_msg *msg)
 {
 
@@ -1170,6 +1185,7 @@ static int ssi_port_probe(struct platform_device *pd)
         omap_port->pdev = &pd->dev;
         omap_port->port_id = port_id;
 
+        INIT_DEFERRABLE_WORK(&omap_port->errqueue_work, ssi_process_errqueue);
         INIT_WORK(&omap_port->work, start_tx_work);
 
         /* initialize HSI port */
@@ -1237,6 +1253,8 @@ static int ssi_port_remove(struct platform_device *pd)
         ssi_debug_remove_port(port);
 #endif
 
+        cancel_delayed_work_sync(&omap_port->errqueue_work);
+
         hsi_port_unregister_clients(port);
 
         port->async     = hsi_dummy_msg;