This is a note to let you know that I've just added the patch titled usb: xhci: fix timeout for transition from RExit to U0 to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: usb-xhci-fix-timeout-for-transition-from-rexit-to-u0.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From a5baeaeabcca3244782a9b6382ebab6f8a58f583 Mon Sep 17 00:00:00 2001 From: Aaron Ma <aaron.ma@xxxxxxxxxxxxx> Date: Fri, 9 Nov 2018 17:21:21 +0200 Subject: usb: xhci: fix timeout for transition from RExit to U0 From: Aaron Ma <aaron.ma@xxxxxxxxxxxxx> commit a5baeaeabcca3244782a9b6382ebab6f8a58f583 upstream. This definition is used by msecs_to_jiffies in milliseconds. According to the comments, max rexit timeout should be 20ms. Align with the comments to properly calculate the delay. Verified on Sunrise Point-LP and Cannon Lake. Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Aaron Ma <aaron.ma@xxxxxxxxxxxxx> Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/host/xhci-hub.c | 4 ++-- drivers/usb/host/xhci.h | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) --- a/drivers/usb/host/xhci-hub.c +++ b/drivers/usb/host/xhci-hub.c @@ -790,7 +790,7 @@ static u32 xhci_get_port_status(struct u time_left = wait_for_completion_timeout( &bus_state->rexit_done[wIndex], msecs_to_jiffies( - XHCI_MAX_REXIT_TIMEOUT)); + XHCI_MAX_REXIT_TIMEOUT_MS)); spin_lock_irqsave(&xhci->lock, flags); if (time_left) { @@ -804,7 +804,7 @@ static u32 xhci_get_port_status(struct u } else { int port_status = readl(port_array[wIndex]); xhci_warn(xhci, "Port resume took longer than %i msec, port status = 0x%x\n", - XHCI_MAX_REXIT_TIMEOUT, + XHCI_MAX_REXIT_TIMEOUT_MS, port_status); status |= USB_PORT_STAT_SUSPEND; clear_bit(wIndex, &bus_state->rexit_ports); --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1490,7 +1490,7 @@ struct xhci_bus_state { * It can take up to 20 ms to transition from RExit to U0 on the * Intel Lynx Point LP xHCI host. */ -#define XHCI_MAX_REXIT_TIMEOUT (20 * 1000) +#define XHCI_MAX_REXIT_TIMEOUT_MS 20 static inline unsigned int hcd_index(struct usb_hcd *hcd) { Patches currently in stable-queue which might be from aaron.ma@xxxxxxxxxxxxx are queue-4.4/usb-xhci-fix-timeout-for-transition-from-rexit-to-u0.patch