linux-kernel - Re: [linux-usb-devel] [BUG] USB

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Message-ID: <Pine.LNX.4.44L0.0711291102290.4516-100000@iolanthe.rowland.org>
Date:	Thu, 29 Nov 2007 11:08:03 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Raymano Garibaldi <raymano@...nos.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Denys Vlasenko <vda.linux@...glemail.com>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	USB development list <linux-usb-devel@...ts.sourceforge.net>,
	<kirk@...nos.com>
Subject: Re: [linux-usb-devel] [BUG] USB_PERSIST

On Thu, 29 Nov 2007, Raymano Garibaldi wrote:

> The feature does work as long as the device remains plugged in and
> that is what I have said in my previous postings too. What I'm saying
> that should work and worked under 2.6.21 and is not working currently
> is the ability to unplug and plug back in the device while the
> computer is suspended before resuming without losing the mount.

Okay, guess I misunderstood what you wrote before.

The patch below for 2.6.23 should do what you want (and more besides).  
It forces the USB Persist feature to apply to all persist-enabled 
devices, whether they were unplugged or not.

There's no chance of this getting accepted into the official kernel in 
such a simple form, but at least it will allow you to do what you want.

Alan Stern


--- 2.6.23/drivers/usb/core/driver.c1	2007-11-29 10:57:36.000000000 -0500
+++ 2.6.23/drivers/usb/core/driver.c	2007-11-29 11:01:44.000000000 -0500
@@ -1550,6 +1550,9 @@
 		if (!(udev->reset_resume && udev->do_remote_wakeup))
 			return -EPERM;
 	}
+
+	/* Force all system resumes to be reset-resumes */
+	udev->reset_resume = 1;
 	return usb_external_resume_device(udev);
 }
 

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