lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

USB: Enhance usage of pm_message_t

Browse Source 
This patch (as1177) modifies the USB core suspend and resume
routines.  The resume functions now will take a pm_message_t argument,
so they will know what sort of resume is occurring.  The new argument
is also passed to the port suspend/resume and bus suspend/resume
routines (although they don't use it for anything but debugging).

In addition, special pm_message_t values are used for user-initiated,
device-initiated (i.e., remote wakeup), and automatic suspend/resume.
By testing these values, drivers can tell whether or not a particular
suspend was an autosuspend.  Unfortunately, they can't do the same for
resumes -- not until the pm_message_t argument is also passed to the
drivers' resume methods.  That will require a bigger change.

IMO, the whole Power Management framework should have been set up this
way in the first place.

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
2008-11-25 16:39:18 -05:00
committed by Greg Kroah-Hartman
parent 4ec06d6296
commit 65bfd2967c
11 changed files with 74 additions and 63 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/usb/class/cdc-wdm.c
View File

@ -764,7 +764,8 @@ static int wdm_suspend(struct usb_interface *intf, pm_message_t message)
mutex_lock(&desc->plock);
#ifdef CONFIG_PM
if (interface_to_usbdev(desc->intf)->auto_pm && test_bit(WDM_IN_USE, &desc->flags)) {
if ((message.event & PM_EVENT_AUTO) &&
test_bit(WDM_IN_USE, &desc->flags)) {
rv = -EBUSY;
} else {
#endif