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[PATCH] USB: central handling for host controllers that were reset during suspend/resume

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This patch (as515b) adds a routine to usbcore to simplify handling of
host controllers that lost power or were reset during suspend/resume.
The new core routine marks all the child devices of the root hub as
NOTATTACHED and tells khubd to disconnect the device structures as soon
as possible.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern
2005-11-14 11:45:38 -05:00
committed by Greg Kroah-Hartman
parent 8364d6b0be
commit 1c50c317e2
6 changed files with 42 additions and 15 deletions
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1
drivers/usb/core/hcd.h
View File

@@ -380,6 +380,7 @@ extern int usb_find_interface_driver (struct usb_device *dev,
#ifdef CONFIG_PM
extern void usb_hcd_suspend_root_hub (struct usb_hcd *hcd);
extern void usb_hcd_resume_root_hub (struct usb_hcd *hcd);
extern void usb_root_hub_lost_power (struct usb_device *rhdev);
extern int hcd_bus_suspend (struct usb_bus *bus);
extern int hcd_bus_resume (struct usb_bus *bus);
#else

33
drivers/usb/core/hub.c
View File

@@ -1039,6 +1039,39 @@ void usb_set_device_state(struct usb_device *udev,
EXPORT_SYMBOL(usb_set_device_state);
#ifdef CONFIG_PM
/**
* usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
* @rhdev: struct usb_device for the root hub
*
* The USB host controller driver calls this function when its root hub
* is resumed and Vbus power has been interrupted or the controller
* has been reset. The routine marks all the children of the root hub
* as NOTATTACHED and marks logical connect-change events on their ports.
*/
void usb_root_hub_lost_power(struct usb_device *rhdev)
{
struct usb_hub *hub;
int port1;
unsigned long flags;
dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
spin_lock_irqsave(&device_state_lock, flags);
hub = hdev_to_hub(rhdev);
for (port1 = 1; port1 <= rhdev->maxchild; ++port1) {
if (rhdev->children[port1 - 1]) {
recursively_mark_NOTATTACHED(
rhdev->children[port1 - 1]);
set_bit(port1, hub->change_bits);
}
}
spin_unlock_irqrestore(&device_state_lock, flags);
}
EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
#endif
static void choose_address(struct usb_device *udev)
{
int devnum;