On Mon, Apr 21, 2008 at 11:23 PM, Matthew Dillon
<[EMAIL PROTECTED]> wrote:
> dillon 2008/04/21 08:23:22 PDT
>
> DragonFly src repository
>
> Modified files:
> sys/bus/usb usb.c
> Log:
> Add an interlock for certain usb task operations.
>
> Revision Changes Path
> 1.40 +50 -15 src/sys/bus/usb/usb.c
>
>
>
> http://www.dragonflybsd.org/cvsweb/src/sys/bus/usb/usb.c.diff?r1=1.39&r2=1.40&f=u
@@ -368,15 +368,21 @@ usb_add_task(usbd_device_handle dev, str
crit_enter();
+ /*
+ * Wait if task is currently executing
+ */
+ while (task->queue == -2)
+ tsleep(task, 0, "usbwttsk", hz);
This will cause deadlock, if task's function wants to enqueue itself.
rum(4) or ural(4) will do that kind of stuffs (the recursion is down
deep into 802.11 stack)
Best Regards,
sephe
--
Live Free or Die
