[PATCH] USB Gadget: dummy_hcd: updates to hcd->state

This patch (as613) moves the updates to hcd->state in the dummy_hcd
driver to where they now belong.  It also uses the new
HC_FLAG_HW_ACCESSIBLE flag in a way that simulates a real PCI
controller, and it adds checks for attempts to resume the bus while the
controller is suspended or to suspend the controller while the bus is
active.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/gadget/dummy_hcd.c b/drivers/usb/gadget/dummy_hcd.c
index 4932b07..ce0d4b4 100644 (file)
--- a/drivers/usb/gadget/dummy_hcd.c
+++ b/drivers/usb/gadget/dummy_hcd.c
@@ -1576,7 +1576,7 @@ static int dummy_hub_status (struct usb_hcd *hcd, char *buf)
        dum = hcd_to_dummy (hcd);
 
        spin_lock_irqsave (&dum->lock, flags);
-       if (hcd->state != HC_STATE_RUNNING)
+       if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
                goto done;
 
        if (dum->resuming && time_after_eq (jiffies, dum->re_timeout)) {
@@ -1623,7 +1623,7 @@ static int dummy_hub_control (
        int             retval = 0;
        unsigned long   flags;
 
-       if (hcd->state != HC_STATE_RUNNING)
+       if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
                return -ETIMEDOUT;
 
        dum = hcd_to_dummy (hcd);
@@ -1756,9 +1756,12 @@ static int dummy_bus_suspend (struct usb_hcd *hcd)
 {
        struct dummy *dum = hcd_to_dummy (hcd);
 
+       dev_dbg (&hcd->self.root_hub->dev, "%s\n", __FUNCTION__);
+
        spin_lock_irq (&dum->lock);
        dum->rh_state = DUMMY_RH_SUSPENDED;
        set_link_state (dum);
+       hcd->state = HC_STATE_SUSPENDED;
        spin_unlock_irq (&dum->lock);
        return 0;
 }
@@ -1766,14 +1769,23 @@ static int dummy_bus_suspend (struct usb_hcd *hcd)
 static int dummy_bus_resume (struct usb_hcd *hcd)
 {
        struct dummy *dum = hcd_to_dummy (hcd);
+       int rc = 0;
+
+       dev_dbg (&hcd->self.root_hub->dev, "%s\n", __FUNCTION__);
 
        spin_lock_irq (&dum->lock);
-       dum->rh_state = DUMMY_RH_RUNNING;
-       set_link_state (dum);
-       if (!list_empty(&dum->urbp_list))
-               mod_timer (&dum->timer, jiffies);
+       if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
+               dev_warn (&hcd->self.root_hub->dev, "HC isn't running!\n");
+               rc = -ENODEV;
+       } else {
+               dum->rh_state = DUMMY_RH_RUNNING;
+               set_link_state (dum);
+               if (!list_empty(&dum->urbp_list))
+                       mod_timer (&dum->timer, jiffies);
+               hcd->state = HC_STATE_RUNNING;
+       }
        spin_unlock_irq (&dum->lock);
-       return 0;
+       return rc;
 }
 
 /*-------------------------------------------------------------------------*/
@@ -1933,12 +1945,19 @@ static int dummy_hcd_remove (struct platform_device *pdev)
 static int dummy_hcd_suspend (struct platform_device *pdev, pm_message_t state)
 {
        struct usb_hcd          *hcd;
+       struct dummy            *dum;
+       int                     rc = 0;
 
        dev_dbg (&pdev->dev, "%s\n", __FUNCTION__);
-       hcd = platform_get_drvdata (pdev);
 
-       hcd->state = HC_STATE_SUSPENDED;
-       return 0;
+       hcd = platform_get_drvdata (pdev);
+       dum = hcd_to_dummy (hcd);
+       if (dum->rh_state == DUMMY_RH_RUNNING) {
+               dev_warn(&pdev->dev, "Root hub isn't suspended!\n");
+               rc = -EBUSY;
+       } else
+               clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+       return rc;
 }
 
 static int dummy_hcd_resume (struct platform_device *pdev)
@@ -1946,9 +1965,9 @@ static int dummy_hcd_resume (struct platform_device *pdev)
        struct usb_hcd          *hcd;
 
        dev_dbg (&pdev->dev, "%s\n", __FUNCTION__);
-       hcd = platform_get_drvdata (pdev);
-       hcd->state = HC_STATE_RUNNING;
 
+       hcd = platform_get_drvdata (pdev);
+       set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
        usb_hcd_poll_rh_status (hcd);
        return 0;
 }