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path: root/drivers/pci/pci-sysfs.c
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Diffstat (limited to 'drivers/pci/pci-sysfs.c')
-rw-r--r--drivers/pci/pci-sysfs.c33
1 files changed, 21 insertions, 12 deletions
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index f952bfea48a..7a94076752d 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -42,7 +42,6 @@ pci_config_attr(subsystem_vendor, "0x%04x\n");
pci_config_attr(subsystem_device, "0x%04x\n");
pci_config_attr(class, "0x%06x\n");
pci_config_attr(irq, "%u\n");
-pci_config_attr(is_enabled, "%u\n");
static ssize_t broken_parity_status_show(struct device *dev,
struct device_attribute *attr,
@@ -112,26 +111,36 @@ static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
(u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
(u8)(pci_dev->class));
}
-static ssize_t
-is_enabled_store(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t count)
+
+static ssize_t is_enabled_store(struct device *dev,
+ struct device_attribute *attr, const char *buf,
+ size_t count)
{
+ ssize_t result = -EINVAL;
struct pci_dev *pdev = to_pci_dev(dev);
- int retval = 0;
/* this can crash the machine when done on the "wrong" device */
if (!capable(CAP_SYS_ADMIN))
return count;
- if (*buf == '0')
- pci_disable_device(pdev);
+ if (*buf == '0') {
+ if (atomic_read(&pdev->enable_cnt) != 0)
+ pci_disable_device(pdev);
+ else
+ result = -EIO;
+ } else if (*buf == '1')
+ result = pci_enable_device(pdev);
+
+ return result < 0 ? result : count;
+}
- if (*buf == '1')
- retval = pci_enable_device(pdev);
+static ssize_t is_enabled_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct pci_dev *pdev;
- if (retval)
- return retval;
- return count;
+ pdev = to_pci_dev (dev);
+ return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
}
static ssize_t