staging: kpc2000: added a helper to get struct kp2000_device from struct device.

The attribute call-backs all use the same formula to get the pcard from
dev:

  struct pci_dev *pdev = to_pci_dev(dev);
  struct kp2000_device *pcard;

  if (!pdev)
    return -ENXIO;
  pcard = pci_get_drvdata(pdev);
  if (!pcard)
    return -ENXIO;

Added a function to reduce the duplicated code.

Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/kpc2000/kpc2000/core.c b/drivers/staging/kpc2000/kpc2000/core.c
index f173523..e58bdde 100644 (file)
--- a/drivers/staging/kpc2000/kpc2000/core.c
+++ b/drivers/staging/kpc2000/kpc2000/core.c
@@ -29,15 +29,21 @@
  * SysFS Attributes
  ******************************************************/
 
-static ssize_t show_attr(struct device *dev, struct device_attribute *attr,
-                        char *buf)
+static struct kp2000_device *get_pcard(struct device *dev)
 {
        struct pci_dev *pdev = to_pci_dev(dev);
-       struct kp2000_device *pcard;
 
        if (!pdev)
-               return -ENXIO;
-       pcard = pci_get_drvdata(pdev);
+               return NULL;
+
+       return pci_get_drvdata(pdev);
+}
+
+static ssize_t show_attr(struct device *dev, struct device_attribute *attr,
+                        char *buf)
+{
+       struct kp2000_device *pcard = get_pcard(dev);
+
        if (!pcard)
                return -ENXIO;
 
@@ -72,14 +78,9 @@ static ssize_t show_attr(struct device *dev, struct device_attribute *attr,
 static ssize_t show_cpld_config_reg(struct device *dev,
                                    struct device_attribute *attr, char *buf)
 {
-       struct pci_dev *pdev = to_pci_dev(dev);
-       struct kp2000_device *pcard;
+       struct kp2000_device *pcard = get_pcard(dev);
        u64 val;
 
-       if (!pdev)
-               return -ENXIO;
-
-       pcard = pci_get_drvdata(pdev);
        if (!pcard)
                return -ENXIO;
 
@@ -91,14 +92,10 @@ static ssize_t cpld_reconfigure(struct device *dev,
                                struct device_attribute *attr,
                                const char *buf, size_t count)
 {
-       struct pci_dev *pdev = to_pci_dev(dev);
+       struct kp2000_device *pcard = get_pcard(dev);
        long wr_val;
-       struct kp2000_device *pcard;
        int rv;
 
-       if (!pdev)
-               return -ENXIO;
-       pcard = pci_get_drvdata(pdev);
        if (!pcard)
                return -ENXIO;