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| author | Alan Stern <stern@rowland.harvard.edu> | 2005-11-14 11:45:38 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-01-04 13:48:31 -0800 |
| commit | 1c50c317e2e7f15427149cbc216a63366468710e (patch) | |
| tree | d48dc0b03090e89c644f73f9997b4f70b6ec9b41 /drivers/usb/core | |
| parent | 8364d6b0be2dbbf162c6aea79615b5025a0d67c2 (diff) | |
| download | kernel_samsung_crespo-1c50c317e2e7f15427149cbc216a63366468710e.zip kernel_samsung_crespo-1c50c317e2e7f15427149cbc216a63366468710e.tar.gz kernel_samsung_crespo-1c50c317e2e7f15427149cbc216a63366468710e.tar.bz2 | |
[PATCH] USB: central handling for host controllers that were reset during suspend/resume
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>
Diffstat (limited to 'drivers/usb/core')
| -rw-r--r-- | drivers/usb/core/hcd.h | 1 | ||||
| -rw-r--r-- | drivers/usb/core/hub.c | 33 |
2 files changed, 34 insertions, 0 deletions
diff --git a/drivers/usb/core/hcd.h b/drivers/usb/core/hcd.h index c8a1b35..591b5aa 100644 --- a/drivers/usb/core/hcd.h +++ b/drivers/usb/core/hcd.h @@ -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 diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index f78bd12..5faf7ed 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -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; |