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Message-ID: <Pine.LNX.4.44L0.0701151058520.15327-100000@netrider.rowland.org> Date: Mon, 15 Jan 2007 11:03:35 -0500 (EST) From: Alan Stern <stern@...land.harvard.edu> To: Oliver Neukum <oliver@...kum.org> cc: icxcnika@....tar.cc, <linux-usb-devel@...ts.sourceforge.net>, <linux-kernel@...r.kernel.org> Subject: Re: [linux-usb-devel] 2.6.20-rc4: usb somehow broken On Mon, 15 Jan 2007, Oliver Neukum wrote: > Am Sonntag, 14. Januar 2007 20:47 schrieb icxcnika@....tar.cc: > > > Can anyone suggest another approach? > > > > > > Alan Stern > > > > Just a thought, you could use both a blacklist approach, and a module > > paramater, or something in sysfs, to allow specifying devices that won't > > be suspend and resume compatible. > > Upon further thought, a module parameter won't do as the problem > will arise without a driver loaded. A sysfs parameter turns the whole > affair into a race condition. Will you set the guard parameter before the > autosuspend logic strikes? > Unfortunately this leaves only the least attractive solution. There could be a mixed approach: a builtin blacklist that is extensible via a procfs- or sysfs-based interface. Note that we actually have two problems to contend with. Some devices must never be autosuspended at all (they disconnect when resuming), and others need a reset after resuming. Alan Stern - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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