[patch V3 35/35] dmaengine: qcom_hidma: Cleanup MSI handling

[Thomas Gleixner <tglx@xxxxxxxxxxxxx>]

From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

There is no reason to walk the MSI descriptors to retrieve the interrupt
number for a device. Use msi_get_virq() instead.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Acked-by: Sinan Kaya <okaya@xxxxxxxxxx>
Cc: dmaengine@xxxxxxxxxxxxxxx
---
 drivers/dma/qcom/hidma.c |   42 ++++++++++++++++++------------------------
 1 file changed, 18 insertions(+), 24 deletions(-)

--- a/drivers/dma/qcom/hidma.c
+++ b/drivers/dma/qcom/hidma.c
@@ -678,11 +678,13 @@ static void hidma_free_msis(struct hidma
 {
 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
        struct device *dev = dmadev->ddev.dev;
-       struct msi_desc *desc;
+       int i, virq;
 
-       /* free allocated MSI interrupts above */
-       for_each_msi_entry(desc, dev)
-               devm_free_irq(dev, desc->irq, &dmadev->lldev);
+       for (i = 0; i < HIDMA_MSI_INTS; i++) {
+               virq = msi_get_virq(dev, i);
+               if (virq)
+                       devm_free_irq(dev, virq, &dmadev->lldev);
+       }
 
        platform_msi_domain_free_irqs(dev);
 #endif
@@ -692,45 +694,37 @@ static int hidma_request_msi(struct hidm
                             struct platform_device *pdev)
 {
 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
-       int rc;
-       struct msi_desc *desc;
-       struct msi_desc *failed_desc = NULL;
+       int rc, i, virq;
 
        rc = platform_msi_domain_alloc_irqs(&pdev->dev, HIDMA_MSI_INTS,
                                            hidma_write_msi_msg);
        if (rc)
                return rc;
 
-       for_each_msi_entry(desc, &pdev->dev) {
-               if (!desc->msi_index)
-                       dmadev->msi_virqbase = desc->irq;
-
-               rc = devm_request_irq(&pdev->dev, desc->irq,
+       for (i = 0; i < HIDMA_MSI_INTS; i++) {
+               virq = msi_get_virq(&pdev->dev, i);
+               rc = devm_request_irq(&pdev->dev, virq,
                                       hidma_chirq_handler_msi,
                                       0, "qcom-hidma-msi",
                                       &dmadev->lldev);
-               if (rc) {
-                       failed_desc = desc;
+               if (rc)
                        break;
-               }
+               if (!i)
+                       dmadev->msi_virqbase = virq;
        }
 
        if (rc) {
                /* free allocated MSI interrupts above */
-               for_each_msi_entry(desc, &pdev->dev) {
-                       if (desc == failed_desc)
-                               break;
-                       devm_free_irq(&pdev->dev, desc->irq,
-                                     &dmadev->lldev);
+               for (--i; i >= 0; i--) {
+                       virq = msi_get_virq(&pdev->dev, i);
+                       devm_free_irq(&pdev->dev, virq, &dmadev->lldev);
                }
+               dev_warn(&pdev->dev,
+                        "failed to request MSI irq, falling back to wired 
IRQ\n");
        } else {
                /* Add callback to free MSIs on teardown */
                hidma_ll_setup_irq(dmadev->lldev, true);
-
        }
-       if (rc)
-               dev_warn(&pdev->dev,
-                        "failed to request MSI irq, falling back to wired 
IRQ\n");
        return rc;
 #else
        return -EINVAL;