From 9fa733f24bb54dd532b5f5d7abc275c4a547c69f Mon Sep 17 00:00:00 2001 From: Roger Quadros Date: Fri, 29 May 2015 17:01:50 +0300 Subject: [PATCH] usb: xhci: Fix suspend/resume when used with OTG core In the OTG case, the controller might not yet have been added or is removed before the system suspends. Assign xhci->main_hcd during probe to prevent NULL pointer de-reference in xhci_suspend/resume(). Use the hcd->state flag to check if HCD is halted and if that is so do nothing for xhci_suspend/resume(). [Only for xhci-plat devices, pci devices need it in gen_setup -Mathias] Signed-off-by: Roger Quadros Signed-off-by: Mathias Nyman Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci-plat.c | 1 + drivers/usb/host/xhci.c | 6 ++++++ 2 files changed, 7 insertions(+) diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c index 267787a9e6e0..890ad9d9d329 100644 --- a/drivers/usb/host/xhci-plat.c +++ b/drivers/usb/host/xhci-plat.c @@ -140,6 +140,7 @@ static int xhci_plat_probe(struct platform_device *pdev) xhci = hcd_to_xhci(hcd); xhci->clk = clk; + xhci->main_hcd = hcd; xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev, dev_name(&pdev->dev), hcd); if (!xhci->shared_hcd) { diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 8a7e31927a3b..e5568bab5e70 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -891,6 +891,9 @@ int xhci_suspend(struct xhci_hcd *xhci, bool do_wakeup) struct usb_hcd *hcd = xhci_to_hcd(xhci); u32 command; + if (!hcd->state) + return 0; + if (hcd->state != HC_STATE_SUSPENDED || xhci->shared_hcd->state != HC_STATE_SUSPENDED) return -EINVAL; @@ -977,6 +980,9 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated) int retval = 0; bool comp_timer_running = false; + if (!hcd->state) + return 0; + /* Wait a bit if either of the roothubs need to settle from the * transition into bus suspend. */ -- 2.30.2