ocxl: Clarify error path in setup_xsl_irq()

Implementing rollback with goto and labels is a common practice that
leads to prettier and more maintainable code. FWIW, this design pattern
is already being used in alloc_link() a few lines below in this file.

Do the same in setup_xsl_irq().

Signed-off-by: Greg Kurz <groug@kaod.org>
Acked-by: Frederic Barrat <fbarrat@linux.ibm.com>
Acked-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/drivers/misc/ocxl/link.c b/drivers/misc/ocxl/link.c
index 646d164..d50b861 100644 (file)
--- a/drivers/misc/ocxl/link.c
+++ b/drivers/misc/ocxl/link.c
@@ -273,9 +273,9 @@ static int setup_xsl_irq(struct pci_dev *dev, struct link *link)
        spa->irq_name = kasprintf(GFP_KERNEL, "ocxl-xsl-%x-%x-%x",
                                link->domain, link->bus, link->dev);
        if (!spa->irq_name) {
-               unmap_irq_registers(spa);
                dev_err(&dev->dev, "Can't allocate name for xsl interrupt\n");
-               return -ENOMEM;
+               rc = -ENOMEM;
+               goto err_xsl;
        }
        /*
         * At some point, we'll need to look into allowing a higher
@@ -283,11 +283,10 @@ static int setup_xsl_irq(struct pci_dev *dev, struct link *link)
         */
        spa->virq = irq_create_mapping(NULL, hwirq);
        if (!spa->virq) {
-               kfree(spa->irq_name);
-               unmap_irq_registers(spa);
                dev_err(&dev->dev,
                        "irq_create_mapping failed for translation interrupt\n");
-               return -EINVAL;
+               rc = -EINVAL;
+               goto err_name;
        }
 
        dev_dbg(&dev->dev, "hwirq %d mapped to virq %d\n", hwirq, spa->virq);
@@ -295,15 +294,21 @@ static int setup_xsl_irq(struct pci_dev *dev, struct link *link)
        rc = request_irq(spa->virq, xsl_fault_handler, 0, spa->irq_name,
                        link);
        if (rc) {
-               irq_dispose_mapping(spa->virq);
-               kfree(spa->irq_name);
-               unmap_irq_registers(spa);
                dev_err(&dev->dev,
                        "request_irq failed for translation interrupt: %d\n",
                        rc);
-               return -EINVAL;
+               rc = -EINVAL;
+               goto err_mapping;
        }
        return 0;
+
+err_mapping:
+       irq_dispose_mapping(spa->virq);
+err_name:
+       kfree(spa->irq_name);
+err_xsl:
+       unmap_irq_registers(spa);
+       return rc;
 }
 
 static void release_xsl_irq(struct link *link)