Re: [PATCH v2] PCI: pciehp: Use down_read/write_nested(reset_lock) to fix lockdep errors

On Thu, Dec 02, 2021 at 01:34:15PM +0100, Hans de Goede wrote:

Use down_read_nested() and down_write_nested() when taking the ctrl->reset_lock rw-sem, passing the number of PCIe hotplug controllers in the path to the PCI root bus as lock subclass parameter. This fixes the following false-positive lockdep report when unplugging a Lenovo X1C8 from a Lenovo 2nd gen TB3 dock:

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Link: https://lore.kernel.org/linux-pci/20190402021933.GA2966@mit.edu/ Link: https://lore.kernel.org/linux-pci/de684a28-9038-8fc6-27ca-3f6f2f6400d7@redha... Cc: stable@vger.kernel.org Reported-by: "Theodore Ts'o" tytso@mit.edu Signed-off-by: Hans de Goede hdegoede@redhat.com

Reviewed-by: Lukas Wunner lukas@wunner.de