This is a note to let you know that I've just added the patch titled
xhci: Remove CONFIG_USB_DEFAULT_PERSIST to prevent xHCI from runtime
to my usb git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git in the usb-linus branch.
The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.
If you have any questions about this process, please let me know.
From 811ae81320da53a5670c36970cefacca8519f90e Mon Sep 17 00:00:00 2001
From: Kai-Heng Feng kai.heng.feng@canonical.com Date: Fri, 10 Dec 2021 16:17:34 +0200 Subject: xhci: Remove CONFIG_USB_DEFAULT_PERSIST to prevent xHCI from runtime suspending
When the xHCI is quirked with XHCI_RESET_ON_RESUME, runtime resume routine also resets the controller.
This is bad for USB drivers without reset_resume callback, because there's no subsequent call of usb_dev_complete() -> usb_resume_complete() to force rebinding the driver to the device. For instance, btusb device stops working after xHCI controller is runtime resumed, if the controlled is quirked with XHCI_RESET_ON_RESUME.
So always take XHCI_RESET_ON_RESUME into account to solve the issue.
Cc: stable@vger.kernel.org Signed-off-by: Kai-Heng Feng kai.heng.feng@canonical.com Signed-off-by: Mathias Nyman mathias.nyman@linux.intel.com Link: https://lore.kernel.org/r/20211210141735.1384209-2-mathias.nyman@linux.intel... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/host/xhci.c | 4 ---- 1 file changed, 4 deletions(-)
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 902f410874e8..af92a9f8ed67 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -3934,7 +3934,6 @@ static void xhci_free_dev(struct usb_hcd *hcd, struct usb_device *udev) struct xhci_slot_ctx *slot_ctx; int i, ret;
-#ifndef CONFIG_USB_DEFAULT_PERSIST /* * We called pm_runtime_get_noresume when the device was attached. * Decrement the counter here to allow controller to runtime suspend @@ -3942,7 +3941,6 @@ static void xhci_free_dev(struct usb_hcd *hcd, struct usb_device *udev) */ if (xhci->quirks & XHCI_RESET_ON_RESUME) pm_runtime_put_noidle(hcd->self.controller); -#endif
ret = xhci_check_args(hcd, udev, NULL, 0, true, __func__); /* If the host is halted due to driver unload, we still need to free the @@ -4094,14 +4092,12 @@ int xhci_alloc_dev(struct usb_hcd *hcd, struct usb_device *udev)
xhci_debugfs_create_slot(xhci, slot_id);
-#ifndef CONFIG_USB_DEFAULT_PERSIST /* * If resetting upon resume, we can't put the controller into runtime * suspend if there is a device attached. */ if (xhci->quirks & XHCI_RESET_ON_RESUME) pm_runtime_get_noresume(hcd->self.controller); -#endif
/* Is this a LS or FS device under a HS hub? */ /* Hub or peripherial? */