PCI : add extremely specialized __pci_reenable_device for default resume
Original patch was posted as "PCI : Move pci_fixup_device and is_enabled".
This 3 of 3 patches does:
- add __pci_reenable_device
(recover former change of 1st patch)
Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Cc: Inaky Perez-Gonzalez <inaky@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 212acd2..287b685 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -676,6 +676,36 @@
return 0;
}
+static int do_pci_enable_device(struct pci_dev *dev, int bars)
+{
+ int err;
+
+ err = pci_set_power_state(dev, PCI_D0);
+ if (err < 0 && err != -EIO)
+ return err;
+ err = pcibios_enable_device(dev, bars);
+ if (err < 0)
+ return err;
+ pci_fixup_device(pci_fixup_enable, dev);
+
+ return 0;
+}
+
+/**
+ * __pci_reenable_device - Resume abandoned device
+ * @dev: PCI device to be resumed
+ *
+ * Note this function is a backend of pci_default_resume and is not supposed
+ * to be called by normal code, write proper resume handler and use it instead.
+ */
+int
+__pci_reenable_device(struct pci_dev *dev)
+{
+ if (atomic_read(&dev->enable_cnt))
+ return do_pci_enable_device(dev, (1 << PCI_NUM_RESOURCES) - 1);
+ return 0;
+}
+
/**
* pci_enable_device_bars - Initialize some of a device for use
* @dev: PCI device to be initialized
@@ -693,16 +723,9 @@
if (atomic_add_return(1, &dev->enable_cnt) > 1)
return 0; /* already enabled */
- err = pci_set_power_state(dev, PCI_D0);
- if (err < 0 && err != -EIO)
- goto err_out;
- err = pcibios_enable_device(dev, bars);
+ err = do_pci_enable_device(dev, bars);
if (err < 0)
- goto err_out;
- pci_fixup_device(pci_fixup_enable, dev);
-
-err_out:
- atomic_dec(&dev->enable_cnt);
+ atomic_dec(&dev->enable_cnt);
return err;
}