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Make sure that the USB system suspend event is executed synchronously

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and not asynchronously. This fixes problems related to USB system
suspend and resume.  It is assumed that we are always allowed to sleep
from the device_suspend() method.

MFC after:	1 week
Submitted by:	jkim
This commit is contained in:
hselasky 2012-03-03 08:11:04 +00:00
parent d236ad156c
commit 402a0f9de4
1 changed files with 21 additions and 2 deletions
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23
sys/dev/usb/controller/usb_controller.c
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@ -89,10 +89,15 @@ TUNABLE_INT("hw.usb.no_boot_wait", &usb_no_boot_wait);
SYSCTL_INT(_hw_usb, OID_AUTO, no_boot_wait, CTLFLAG_RDTUN, &usb_no_boot_wait, 0,
"No USB device enumerate waiting at boot.");
static int usb_no_suspend_wait = 0;
TUNABLE_INT("hw.usb.no_suspend_wait", &usb_no_suspend_wait);
SYSCTL_INT(_hw_usb, OID_AUTO, no_suspend_wait, CTLFLAG_RW|CTLFLAG_TUN,
&usb_no_suspend_wait, 0, "No USB device waiting at system suspend.");
static int usb_no_shutdown_wait = 0;
TUNABLE_INT("hw.usb.no_shutdown_wait", &usb_no_shutdown_wait);
SYSCTL_INT(_hw_usb, OID_AUTO, no_shutdown_wait, CTLFLAG_RW|CTLFLAG_TUN, &usb_no_shutdown_wait, 0,
"No USB device waiting at system shutdown.");
SYSCTL_INT(_hw_usb, OID_AUTO, no_shutdown_wait, CTLFLAG_RW|CTLFLAG_TUN,
&usb_no_shutdown_wait, 0, "No USB device waiting at system shutdown.");
static devclass_t usb_devclass;
@ -240,6 +245,11 @@ usb_suspend(device_t dev)
USB_BUS_LOCK(bus);
usb_proc_msignal(&bus->explore_proc,
&bus->suspend_msg[0], &bus->suspend_msg[1]);
if (usb_no_suspend_wait == 0) {
/* wait for suspend callback to be executed */
usb_proc_mwait(&bus->explore_proc,
&bus->suspend_msg[0], &bus->suspend_msg[1]);
}
USB_BUS_UNLOCK(bus);
return (0);
@ -407,6 +417,15 @@ usb_bus_suspend(struct usb_proc_msg *pm)
USB_BUS_UNLOCK(bus);
/*
* We use the shutdown event here because the suspend and
* resume events are reserved for the USB port suspend and
* resume. The USB system suspend is implemented like full
* shutdown and all connected USB devices will be disconnected
* subsequently. At resume all USB devices will be
* re-connected again.
*/
bus_generic_shutdown(bus->bdev);
usbd_enum_lock(udev);