ksuspend_usbd : what does this daemon do ?

[Frank Jansen]

Greetings,
          What does the daemon ksuspend_usb do ? I'm making a list of the
back ground processes and what they do then will post it here. Save others
hunting around for what what little there is.
  Haven't found any lists on-line anywhere yet. Apparently there's an
O'Reilly book that lists daemons and functions but haven't see it anywhere
local.
  Thanks in advance.

frank.jansen@..., ZL2TTS
   


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[Andrew Sackville-West]

On Sun, Nov 08, 2009 at 12:32:01PM +1300, C.T.F. Jansen wrote:
> Greetings,
>          What does the daemon ksuspend_usb do ?
[...]

I *think* it monitors usb and suspends the usb subsystem when it's not
being used. This is a powersaving feature. But that is really only a
guess based on the name of the daemon and my own minimal knowledge
that such a thing is possible.

A

[deloptes]

Andrew Sackville-West wrote:

> ksuspend_usb

it's not adaemon but a kernel process (thread)

look into ./drivers/usb/core/usb.c to learn more

/opt/software/linux-2.6.31.6# grep -r ksuspend_usb .
Двоичен файл ./drivers/usb/core/hcd.o съвпада
./drivers/usb/core/usb.c:struct workqueue_struct *ksuspend_usb_wq;
./drivers/usb/core/usb.c:static int ksuspend_usb_init(void)
./drivers/usb/core/usb.c:       ksuspend_usb_wq =
create_freezeable_workqueue("ksuspend_usbd");
./drivers/usb/core/usb.c:       if (!ksuspend_usb_wq)
./drivers/usb/core/usb.c:static void ksuspend_usb_cleanup(void)
./drivers/usb/core/usb.c:       destroy_workqueue(ksuspend_usb_wq);
./drivers/usb/core/usb.c:#define ksuspend_usb_init()    0
./drivers/usb/core/usb.c:#define ksuspend_usb_cleanup() do {} while (0)
./drivers/usb/core/usb.c:       retval = ksuspend_usb_init();
./drivers/usb/core/usb.c:       ksuspend_usb_cleanup();
./drivers/usb/core/usb.c:       ksuspend_usb_cleanup();

./drivers/usb/core/driver.c:                  
queue_delayed_work(ksuspend_usb_wq, &udev->autosuspend,
./drivers/usb/core/driver.c:                  
queue_delayed_work(ksuspend_usb_wq, &udev->autosuspend,
./drivers/usb/core/driver.c:            queue_work(ksuspend_usb_wq,
&udev->autoresume);
./drivers/usb/core/hcd.c:               queue_work(ksuspend_usb_wq,
&hcd->wakeup_work);



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