linux-kernel - Re: Problem with modification to hid_post

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Date:	Wed, 17 Feb 2010 14:38:40 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Rick L. Vinyard, Jr." <rvinyard@...nmsu.edu>
cc:	Linux <linux-kernel@...r.kernel.org>,
	Linux USB <linux-usb@...r.kernel.org>
Subject: Re: Problem with modification to hid_post_reset

On Wed, 17 Feb 2010, Rick L. Vinyard, Jr. wrote:

> Following is a short patch that I've been using to add hooks before and
> after device reset. I probably won't end up needing the post_reset_finish
> hook but I have it there for testing right now.
> 
> The first hook I need so I can set a flag that is dealt with on the first
> raw event, and I need to ensure the flag is set prior to queue restart.
> 
> From what I can tell, these shouldn't cause any problems... they should be
> trivial but they are causing a kernel fault on resume from a suspend.
> 
> The enclosed patch probably has line wrapping problems. If someone wants
> to test it I'll send a more proper patch, but I thought I'd throw it out
> there and see if anyone sees anything obvious.

I agree, there doesn't seem to be anything really wrong.  See below...

> ---- G13 code ----
> 
> #define hid_get_g13data(hdev) \
> 	((struct g13_data *)(hid_get_drvdata(hdev)))
> 
> static void g13_post_reset_start(struct hid_device *hdev)
> {
> 	struct g13_data *data;
> 
> 	/* Get the underlying data value */
> 	data = hid_get_g13data(hdev);
> 	/* need_reset is declared as int */
> 	data->need_reset = 1;

Is your problem caused by data coming out NULL?

Alan Stern

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