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USB: flush outstanding URBs when suspending

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This patch (as989) makes usbcore flush all outstanding URBs for each
device as the device is suspended.  This will be true even when
CONFIG_USB_SUSPEND is not enabled.

In addition, an extra can_submit flag is added to the usb_device
structure.  That flag will be turned off whenever a suspend request
has been received for the device, even if the device isn't actually
suspended because CONFIG_USB_SUSPEND isn't set.

It's no longer necessary to check for the device state being equal to
USB_STATE_SUSPENDED during URB submission; that check can be replaced
by a check of the can_submit flag.  This also permits us to remove
some questionable references to the deprecated power.power_state field.

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
2007-09-10 11:34:26 -04:00
committed by Greg Kroah-Hartman
parent 95cf82f99c
commit 6840d2555a
6 changed files with 17 additions and 12 deletions
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10
drivers/usb/core/driver.c
View File

@ -1102,9 +1102,16 @@ static int usb_suspend_both(struct usb_device *udev, pm_message_t msg)
if (udev->auto_pm)
autosuspend_check(udev);
/* If the suspend succeeded, propagate it up the tree */
/* If the suspend succeeded then prevent any more URB submissions,
* flush any outstanding URBs, and propagate the suspend up the tree.
*/
} else {
cancel_delayed_work(&udev->autosuspend);
udev->can_submit = 0;
for (i = 0; i < 16; ++i) {
usb_hcd_flush_endpoint(udev, udev->ep_out[i]);
usb_hcd_flush_endpoint(udev, udev->ep_in[i]);
}
if (parent)
usb_autosuspend_device(parent);
}
@ -1154,6 +1161,7 @@ static int usb_resume_both(struct usb_device *udev)
status = -ENODEV;
goto done;
}
udev->can_submit = 1;
/* Propagate the resume up the tree, if necessary */
if (udev->state == USB_STATE_SUSPENDED) {