xhci: Use pm_runtime_get to prevent RPM on unsupported systems

commit 31004740e42846a6f0bb255e6348281df3eb8032 upstream.

Use pm_runtime_put in the remove function and pm_runtime_get to disable
RPM on platforms that don't support runtime D3, as re-enabling it through
sysfs auto power control may cause the controller to malfunction. This
can lead to issues such as hotplug devices not being detected due to
failed interrupt generation.

Fixes: a5d6264b638e ("xhci: Enable RPM on controllers that support low-power states")
Cc: stable <stable@kernel.org>
Signed-off-by: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20241024133718.723846-1-Basavaraj.Natikar@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 3332b31a1354e7ccc0ab07fd3869894328b62cd3..d358d30569e579edff7d0250c6eab61d0e6786ec 100644 (file)
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -527,7 +527,7 @@ static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
        pm_runtime_put_noidle(&dev->dev);
 
        if (pci_choose_state(dev, PMSG_SUSPEND) == PCI_D0)
-               pm_runtime_forbid(&dev->dev);
+               pm_runtime_get(&dev->dev);
        else if (xhci->quirks & XHCI_DEFAULT_PM_RUNTIME_ALLOW)
                pm_runtime_allow(&dev->dev);
 
@@ -554,7 +554,9 @@ static void xhci_pci_remove(struct pci_dev *dev)
 
        xhci->xhc_state |= XHCI_STATE_REMOVING;
 
-       if (xhci->quirks & XHCI_DEFAULT_PM_RUNTIME_ALLOW)
+       if (pci_choose_state(dev, PMSG_SUSPEND) == PCI_D0)
+               pm_runtime_put(&dev->dev);
+       else if (xhci->quirks & XHCI_DEFAULT_PM_RUNTIME_ALLOW)
                pm_runtime_forbid(&dev->dev);
 
        if (xhci->shared_hcd) {