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PCI: Simplify pci_dev_reset_slot_function()

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pci_dev_reset_slot_function() refuses to reset a hotplug slot if it is
shared by multiple pci_devs.  That's the case if and only if the slot is
occupied by a multifunction device.

Simplify the function to check the device's multifunction flag instead
of iterating over the devices on the bus.  (Iterating over the devices
requires holding pci_bus_sem, which the function erroneously does not
acquire.)

Link: https://lore.kernel.org/r/c6aab5af096f7b1b3db57f6335cebba8f0fcca89.1595330431.git.lukas@wunner.de
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Lukas Wunner 2020-07-21 13:24:51 +02:00 committed by Bjorn Helgaas
parent 8c46d543aa
commit 10791141a6
1 changed files with 1 additions and 7 deletions
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8
drivers/pci/pci.c
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@ -4917,16 +4917,10 @@ static int pci_reset_hotplug_slot(struct hotplug_slot *hotplug, int probe)
static int pci_dev_reset_slot_function(struct pci_dev *dev, int probe)
{
struct pci_dev *pdev;
if (dev->subordinate || !dev->slot ||
if (dev->multifunction || dev->subordinate || !dev->slot ||
dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET)
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);
}