linux-kernel - Re: [PATCH 2/4] firewire: cdev: use an idr rather than a linked list for resources

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Date:	Thu, 18 Dec 2008 23:43:48 +0100
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	linux1394-devel@...ts.sourceforge.net
CC:	linux-kernel@...r.kernel.org, Jay Fenlason <fenlason@...hat.com>
Subject: Re: [PATCH 2/4] firewire: cdev: use an idr rather than a linked list
 for resources

Stefan Richter wrote on 2008-12-14:
> From: Jay Fenlason <fenlason@...hat.com>
> 
> The current code uses a linked list and a counter for storing
> resources and the corresponding handle numbers.  By changing to an idr
> we can be safe from counter wrap-around giving two resources the same
> handle.
> 
> Furthermore, the deallocation ioctls now check whether the resource to
> be freed is of the intended type.
> 
> Signed-off-by: Jay Fenlason <fenlason@...hat.com>
> 
> Some rework by Stefan R:
>   - The idr API documentation says we get an ID within 0...0x7fffffff.
>     Hence we can rest assured that idr handles fit into cdev handles.
>   - Fix some races.  Add a client->in_shutdown flag for this purpose.
>   - Add allocation retry to add_client_resource().
>   - It is possible to use idr_for_each() in fw_device_op_release().
>   - Small style changes.
> 
> Signed-off-by: Stefan Richter <stefanr@...6.in-berlin.de>

Back to the drawing board.  This patch breaks FCP for dvgrab, kino,
gscanbus.

dvgrab:  only works with -guid ...
kino:  shows live preview but can't list nor control camcorder
gscanbus:  segfaults if I click on the camera icon to bring up the info
window with AV/C controls.
-- 
Stefan Richter
-=====-==--- ==-- =--=-
http://arcgraph.de/sr/
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