From f370b9968a220a3d79d870dd7dee674cc0ff3d10 Mon Sep 17 00:00:00 2001 From: Andiry Xu Date: Sat, 14 Apr 2012 02:54:30 +0800 Subject: xHCI: keep track of ports being resumed and indicate in hub_status_data This commit adds a bit-array to xhci bus_state for keeping track of which ports are undergoing a resume transition. If any of the bits are set when xhci_hub_status_data() is called, the routine will return a non-zero value even if no ports have any status changes pending. This will allow usbcore to handle races between root-hub suspend and port wakeup. This patch should be backported to kernels as old as 3.4, that contain the commit 879d38e6bc36d73b0ac40ec9b0d839fda9fa8b1a "USB: fix race between root-hub suspend and remote wakeup". Signed-off-by: Andiry Xu Signed-off-by: Sarah Sharp Cc: Alan Stern Cc: stable@vger.kernel.org --- drivers/usb/host/xhci-ring.c | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/usb/host/xhci-ring.c') diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 3d9422f16a20..cb1de111daee 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -1377,6 +1377,7 @@ static void handle_port_status(struct xhci_hcd *xhci, xhci_dbg(xhci, "resume HS port %d\n", port_id); bus_state->resume_done[faked_port_index] = jiffies + msecs_to_jiffies(20); + set_bit(faked_port_index, &bus_state->resuming_ports); mod_timer(&hcd->rh_timer, bus_state->resume_done[faked_port_index]); /* Do the rest in GetPortStatus */ -- cgit v1.2.3