From 170ed807340b4db0a5e010c2e4da43cf5a2c9a29 Mon Sep 17 00:00:00 2001 From: Lan Tianyu Date: Mon, 15 Oct 2012 15:38:34 +0800 Subject: usb/xhci: release xhci->lock during turning on/off usb port's acpi power resource and checking the existence of port's power resource When setting usb port's acpi power resource, there will be some xhci hub requests. This will cause dead lock since xhci->lock has been held before setting acpi power resource in the xhci_hub_control(). The usb_acpi_power_manageable() function might fall into sleep so release xhci->lock before invoking it. Signed-off-by: Lan Tianyu Signed-off-by: Sarah Sharp --- drivers/usb/host/xhci-hub.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'drivers/usb/host/xhci-hub.c') diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c index aa90ad4d4fd5..65d416c08cef 100644 --- a/drivers/usb/host/xhci-hub.c +++ b/drivers/usb/host/xhci-hub.c @@ -809,11 +809,13 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, temp = xhci_readl(xhci, port_array[wIndex]); xhci_dbg(xhci, "set port power, actual port %d status = 0x%x\n", wIndex, temp); + spin_unlock_irqrestore(&xhci->lock, flags); temp = usb_acpi_power_manageable(hcd->self.root_hub, wIndex); if (temp) usb_acpi_set_power_state(hcd->self.root_hub, wIndex, true); + spin_lock_irqsave(&xhci->lock, flags); break; case USB_PORT_FEAT_RESET: temp = (temp | PORT_RESET); @@ -917,11 +919,13 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, xhci_writel(xhci, temp & ~PORT_POWER, port_array[wIndex]); + spin_unlock_irqrestore(&xhci->lock, flags); temp = usb_acpi_power_manageable(hcd->self.root_hub, wIndex); if (temp) usb_acpi_set_power_state(hcd->self.root_hub, wIndex, false); + spin_lock_irqsave(&xhci->lock, flags); break; default: goto error; -- cgit v1.2.3 From 27c411c95a8e9ed92be658abf1d63e22873a3a66 Mon Sep 17 00:00:00 2001 From: Lan Tianyu Date: Mon, 15 Oct 2012 15:38:35 +0800 Subject: usb/xhci: Remove (__force__ __u16) before assigning DeviceRemovable and assign directly. Struct usb_hub_descriptor.ss.DeviceRemovable has been defined as __le16 and (__force__ __u16) doesn't need. Signed-off-by: Lan Tianyu Signed-off-by: Sarah Sharp --- drivers/usb/host/xhci-hub.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) (limited to 'drivers/usb/host/xhci-hub.c') diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c index 65d416c08cef..a686cf4905bb 100644 --- a/drivers/usb/host/xhci-hub.c +++ b/drivers/usb/host/xhci-hub.c @@ -151,9 +151,8 @@ static void xhci_usb3_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci, if (portsc & PORT_DEV_REMOVE) port_removable |= 1 << (i + 1); } - memset(&desc->u.ss.DeviceRemovable, - (__force __u16) cpu_to_le16(port_removable), - sizeof(__u16)); + + desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable); } static void xhci_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci, -- cgit v1.2.3