Re: [linux-pm] [PATCH] [suspend] pci_raw_set_power_state: replacemsleep by udelay in resuming procedure

[Alan Stern]

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

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