[PATCH] staging: kpc2000: simplify error handling in kp2000_pcie_probe

[Simon Sandström]

We can get rid of a few iounmaps in the middle of the function by
re-ordering the error handling labels and adding two new labels.

Signed-off-by: Simon Sandström <si...@nikanor.nu>
---

This change has not been tested besides by compiling. It might be good
took take an extra look to make sure that I got everything right.

Also, this change was proposed by Dan Carpenter. Should I add anything
in the commit message to show this?

- Simon

 drivers/staging/kpc2000/kpc2000/core.c | 22 ++++++++++------------
 1 file changed, 10 insertions(+), 12 deletions(-)

diff --git a/drivers/staging/kpc2000/kpc2000/core.c 
b/drivers/staging/kpc2000/kpc2000/core.c
index 610ea549d240..cb05cca687e1 100644
--- a/drivers/staging/kpc2000/kpc2000/core.c
+++ b/drivers/staging/kpc2000/kpc2000/core.c
@@ -351,12 +351,11 @@ static int kp2000_pcie_probe(struct pci_dev *pdev,
 
        err = pci_request_region(pcard->pdev, REG_BAR, KP_DRIVER_NAME_KP2000);
        if (err) {
-               iounmap(pcard->regs_bar_base);
                dev_err(&pcard->pdev->dev,
                        "probe: failed to acquire PCI region (%d)\n",
                        err);
                err = -ENODEV;
-               goto err_disable_device;
+               goto err_unmap_regs;
        }
 
        pcard->regs_base_resource.start = reg_bar_phys_addr;
@@ -374,7 +373,7 @@ static int kp2000_pcie_probe(struct pci_dev *pdev,
                dev_err(&pcard->pdev->dev,
                        "probe: DMA_BAR could not remap memory to virtual 
space\n");
                err = -ENODEV;
-               goto err_unmap_regs;
+               goto err_release_regs;
        }
        dev_dbg(&pcard->pdev->dev,
                "probe: DMA_BAR virt hardware address start [%p]\n",
@@ -384,11 +383,10 @@ static int kp2000_pcie_probe(struct pci_dev *pdev,
 
        err = pci_request_region(pcard->pdev, DMA_BAR, "kp2000_pcie");
        if (err) {
-               iounmap(pcard->dma_bar_base);
                dev_err(&pcard->pdev->dev,
                        "probe: failed to acquire PCI region (%d)\n", err);
                err = -ENODEV;
-               goto err_unmap_regs;
+               goto err_unmap_dma;
        }
 
        pcard->dma_base_resource.start = dma_bar_phys_addr;
@@ -400,7 +398,7 @@ static int kp2000_pcie_probe(struct pci_dev *pdev,
        pcard->sysinfo_regs_base = pcard->regs_bar_base;
        err = read_system_regs(pcard);
        if (err)
-               goto err_unmap_dma;
+               goto err_release_dma;
 
        // Disable all "user" interrupts because they're not used yet.
        writeq(0xFFFFFFFFFFFFFFFF,
@@ -438,14 +436,14 @@ static int kp2000_pcie_probe(struct pci_dev *pdev,
        if (err) {
                dev_err(&pcard->pdev->dev,
                        "CANNOT use DMA mask %0llx\n", DMA_BIT_MASK(64));
-               goto err_unmap_dma;
+               goto err_release_dma;
        }
        dev_dbg(&pcard->pdev->dev,
                "Using DMA mask %0llx\n", dma_get_mask(PCARD_TO_DEV(pcard)));
 
        err = pci_enable_msi(pcard->pdev);
        if (err < 0)
-               goto err_unmap_dma;
+               goto err_release_dma;
 
        rv = request_irq(pcard->pdev->irq, kp2000_irq_handler, IRQF_SHARED,
                         pcard->name, pcard);
@@ -478,14 +476,14 @@ static int kp2000_pcie_probe(struct pci_dev *pdev,
        free_irq(pcard->pdev->irq, pcard);
 err_disable_msi:
        pci_disable_msi(pcard->pdev);
+err_release_dma:
+       pci_release_region(pdev, DMA_BAR);
 err_unmap_dma:
        iounmap(pcard->dma_bar_base);
-       pci_release_region(pdev, DMA_BAR);
-       pcard->dma_bar_base = NULL;
+err_release_regs:
+       pci_release_region(pdev, REG_BAR);
 err_unmap_regs:
        iounmap(pcard->regs_bar_base);
-       pci_release_region(pdev, REG_BAR);
-       pcard->regs_bar_base = NULL;
 err_disable_device:
        pci_disable_device(pcard->pdev);
 err_remove_ida:
-- 
2.20.1