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| author | Alex Williamson <alex.williamson@redhat.com> | 2013-08-08 22:09:43 +0200 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2013-08-14 22:57:17 +0200 |
| commit | 608c388122c72e1bf11ba8113434eb3d0c40c32d (patch) | |
| tree | a67398b75734e679d6377a6e7ba170030ef301b8 | |
| parent | PCI: pciehp: Add reset_slot() method (diff) | |
| download | linux-608c388122c72e1bf11ba8113434eb3d0c40c32d.tar.xz linux-608c388122c72e1bf11ba8113434eb3d0c40c32d.zip | |
PCI: Add slot reset option to pci_dev_reset()
If the hotplug controller provides a way to reset a slot, use that
before a direct parent bus reset. Like the bus reset option, this is
only available when a single pci_dev occupies the slot.
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
| -rw-r--r-- | drivers/pci/pci.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index d46860898e1f..9407aabc77a3 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -22,6 +22,7 @@ #include <linux/interrupt.h> #include <linux/device.h> #include <linux/pm_runtime.h> +#include <linux/pci_hotplug.h> #include <asm-generic/pci-bridge.h> #include <asm/setup.h> #include "pci.h" @@ -3256,6 +3257,35 @@ static int pci_parent_bus_reset(struct pci_dev *dev, int probe) return 0; } +static int pci_reset_hotplug_slot(struct hotplug_slot *hotplug, int probe) +{ + int rc = -ENOTTY; + + if (!hotplug || !try_module_get(hotplug->ops->owner)) + return rc; + + if (hotplug->ops->reset_slot) + rc = hotplug->ops->reset_slot(hotplug, probe); + + module_put(hotplug->ops->owner); + + return rc; +} + +static int pci_dev_reset_slot_function(struct pci_dev *dev, int probe) +{ + struct pci_dev *pdev; + + if (dev->subordinate || !dev->slot) + return -ENOTTY; + + list_for_each_entry(pdev, &dev->bus->devices, bus_list) + if (pdev != dev && pdev->slot == dev->slot) + return -ENOTTY; + + return pci_reset_hotplug_slot(dev->slot->hotplug, probe); +} + static int __pci_dev_reset(struct pci_dev *dev, int probe) { int rc; @@ -3278,6 +3308,10 @@ static int __pci_dev_reset(struct pci_dev *dev, int probe) if (rc != -ENOTTY) goto done; + rc = pci_dev_reset_slot_function(dev, probe); + if (rc != -ENOTTY) + goto done; + rc = pci_parent_bus_reset(dev, probe); done: return rc; |