netdev - Re: [PATCH] 3Com PCI 3c905 causes annoying pci_set_power

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date:	Tue, 08 May 2007 01:40:24 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Bjørn Mork <bjorn@...k.no>
CC:	netdev <netdev@...r.kernel.org>, Greg KH <gregkh@...e.de>
Subject: Re: [PATCH] 3Com PCI 3c905 causes annoying pci_set_power_state()
 messages

Bjørn Mork wrote:
> I don't know if this is the correct place for 3c59x bugs.  Couldn't find
> a maintainer entry for it.  Please redirect as appropriate.
> 
> pci_set_power_state() is a bit weird, causing a failure if a device
> doesn't support PM and the driver tries to
> 
>  1) save it's power_state, 
>  2) wake up and do something, and 
>  3) then reset to the saved state.
> 
> The 3c59x driver does this in it's ioctl function.
> 
> 
> pci_set_power_state() will never set current_state for such devices,
> causing them to remain in PCI_UNKNOWN (5) forever.  But if you try to
> set the state to PCI_UNKNOWN, bounding will kick in, limiting the state
> to PCI_D3hot (3).  Then pci_set_power_state() will complain because 
> PCI_D3hot < current_state, printing useless messages like this:
> 
>  pci_set_power_state(): 0000:00:09.0: state=3, current state=5
>  pci_set_power_state(): 0000:00:09.0: state=3, current state=5
> 
> and returning -EINVAL.
> 
> I believe this is wrong because pci_set_power_state() is supposed to
> return -EIO if device does not support PCI PM.

Yes, please fix PCI.

	Jeff



-
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html