netdev - Re: [PATCH][RFC] smsc95xx: enable dynamic autosuspend (RFC)

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

Message-ID: <1404210.ufpq7a3oeI@linux-lqwf.site>
Date:	Mon, 10 Dec 2012 13:09:23 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	Steve Glendinning <steve.glendinning@...well.net>
Cc:	netdev@...r.kernel.org, Ming Lei <ming.lei@...onical.com>,
	linux-usb@...r.kernel.org, gregkh@...uxfoundation.org
Subject: Re: [PATCH][RFC] smsc95xx: enable dynamic autosuspend (RFC)

On Monday 10 December 2012 11:51:41 Steve Glendinning wrote:
> This is a work in-progress patch.  It's not yet complete but
> I thought I'd share it for comments, feedback and testing.
> 
> This patch enables dynamic autosuspend for all devices
> supported by the driver, but it will only actually work on
> LAN9500A (as this has a new SUSPEND3 mode for this purpose).

So this is a problem with remote wakeup on older hardware?

> Unfortunately we don't know if the connected device supports
> this feature until we query its ID register at runtime.
> 
> On unsupported devices (LAN9500/9512/9514) this patch claims
> to support the feature but if enabled it will always return
> failure to the autosuspend call (and fill up the kernel log
> with a message every 2s).
> 
> Suggestions on how best to indicate this capability at runtime
> instead of compile-time would be appreciated, so we don't have
> to repeatedly fail if accidentally enabled.  Or maybe this is
> actually the best way?

If this is a problem with remote wakeup, you should up the
pm counter (usb_autopm_get_noresume()) in .manage_power
That was the reason I implemented this is a callback and not as
a helper in usbnet.

	Regards
		Oliver

--
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