On Thu, 16 Jul 2009, Wu Zhangjin wrote:

we can not call msleep() when resuming from STR/Standby: if the
current_state of the pci device is PCI_D3hot, means we are in the
procedure of resuming, in this procedure, we can not re-schedule,
otherwise, there will be a deadlock.

I don't understand.

First of all, why does current_state == PCI_D3hot mean the system is
resuming from sleep?  Isn't it possible that the PCI device is going
through a runtime resume?

Secondly, why will scheduling during a resume cause a deadlock?

Alan Stern