staging: ccree: replace msleep with a completion

When the driver would try to queue commands to the HW FIFO but ran out of
slots it would use msleep as a delay until the FIFO would clear. This is
messy and not accurate.

Replace the msleep with a proper completion on the event of command
completion which should indicate at least one slot is free.
Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/ccree/ssi_driver.c

@@ -251,6 +251,8 @@ static int init_cc_resources(struct platform_device *plat_dev)
 	}
 	dev_dbg(dev, "Registered to IRQ: %d\n", new_drvdata->irq);
 
+	init_completion(&new_drvdata->hw_queue_avail);
+
 	if (!plat_dev->dev.dma_mask)
 		plat_dev->dev.dma_mask = &plat_dev->dev.coherent_dma_mask;
 

drivers/staging/ccree/ssi_driver.h

@@ -125,6 +125,7 @@ struct ssi_drvdata {
 	int irq;
 	u32 irq_mask;
 	u32 fw_ver;
+	struct completion hw_queue_avail; /* wait for HW queue availability */
 	struct platform_device *plat_dev;
 	ssi_sram_addr_t mlli_sram_addr;
 	void *buff_mgr_handle;

drivers/staging/ccree/ssi_request_mgr.c

@@ -312,8 +312,9 @@ int send_request(
 			return rc;
 		}
 
-		/* HW queue is full - short sleep */
-		msleep(1);
+		/* HW queue is full - wait for it to clear up */
+		wait_for_completion_interruptible(&drvdata->hw_queue_avail);
+		reinit_completion(&drvdata->hw_queue_avail);
 	} while (1);
 
 	/* Additional completion descriptor is needed incase caller did not
@@ -452,6 +453,8 @@ void complete_request(struct ssi_drvdata *drvdata)
 {
 	struct ssi_request_mgr_handle *request_mgr_handle =
 						drvdata->request_mgr_handle;
+
+	complete(&drvdata->hw_queue_avail);
 #ifdef COMP_IN_WQ
 	queue_delayed_work(request_mgr_handle->workq,
 			   &request_mgr_handle->compwork, 0);