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PCI: Fix lock symmetry in pci_slot_unlock()

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commit f3efb9569b4a21354ef2caf7ab0608a3e14cc6e4 upstream.

The commit a4e772898f8b ("PCI: Add missing bridge lock to pci_bus_lock()")
made the lock function to call depend on dev->subordinate but left
pci_slot_unlock() unmodified creating locking asymmetry compared with
pci_slot_lock().

Because of the asymmetric lock handling, the same bridge device is unlocked
twice. First pci_bus_unlock() unlocks bus->self and then pci_slot_unlock()
will unconditionally unlock the same bridge device.

Move pci_dev_unlock() inside an else branch to match the logic in
pci_slot_lock().

Fixes: a4e772898f8b ("PCI: Add missing bridge lock to pci_bus_lock()")
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Lukas Wunner <lukas@wunner.de>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20250505115412.37628-1-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ilpo Järvinen 2025-05-05 14:54:12 +03:00 • committed by Greg Kroah-Hartman
commit acf5c9d8b3
1 changed files with 2 additions and 1 deletions
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3
drivers/pci/pci.c
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@ -5296,7 +5296,8 @@ static void pci_slot_unlock(struct pci_slot *slot)
continue;
if (dev->subordinate)
pci_bus_unlock(dev->subordinate);
pci_dev_unlock(dev);
else
pci_dev_unlock(dev);
}
}