From: Oliver Neukum <oneukum@suse.de>
To: Stefani Seibold <stefani@seibold.net>
Cc: "linux-kernel" <linux-kernel@vger.kernel.org>,
Greg KH <gregkh@linuxfoundation.org>,
alan@lxorguk.ukuu.org.uk, linux-usb@vger.kernel.org,
Alan Stern <stern@rowland.harvard.edu>
Subject: Re: RFC: remove usb_device pointer from usb_skeleton.c
Date: Fri, 8 Jun 2012 10:28:07 +0200 [thread overview]
Message-ID: <201206081028.07229.oneukum@suse.de> (raw)
In-Reply-To: <1339139935.16819.5.camel@wall-e>
Am Freitag, 8. Juni 2012, 09:18:55 schrieb Stefani Seibold:
> The connected flag could be also replaced by a "intf->condition ==
> USB_INTERFACE_BOUND", which can be hided by a macro.
No, I am sorry, it cannot. You'd know the interface is bound, but not necessarily
to your driver or even the same "incarnation" of your driver. The fundamental
problem is that we have no data structure describing the binding between a device
and a driver so we cannot refcount that.
As a consequence all refcounting just ensures that the device and interface
data structures stay in memory, but we can make only very limited (read-only)
use of them after a disconnection.
Regards
Oliver
next prev parent reply other threads:[~2012-06-08 8:31 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-06 16:27 [PATCH] fix usb skeleton driver stefani
2012-06-06 16:27 ` [PATCH 01/11] fix wrong label in skel_open stefani
2012-06-06 18:52 ` Oliver Neukum
2012-06-06 19:59 ` Stefani Seibold
2012-06-06 16:27 ` [PATCH 02/11] code cleanup stefani
2012-06-06 18:57 ` Oliver Neukum
2012-06-06 16:27 ` [PATCH 03/11] remove dead code stefani
2012-06-06 16:27 ` [PATCH 04/11] remove usb_interface pointer stefani
2012-06-06 18:59 ` Oliver Neukum
2012-06-06 20:04 ` Stefani Seibold
2012-06-06 20:19 ` Alan Stern
2012-06-06 22:54 ` Greg KH
2012-06-07 8:07 ` Stefani Seibold
2012-06-07 11:51 ` Stefani Seibold
2012-06-07 14:28 ` Alan Stern
2012-06-07 15:03 ` Stefani Seibold
2012-06-07 15:27 ` Alan Stern
2012-06-07 19:50 ` Stefani Seibold
2012-06-07 20:42 ` Alan Stern
2012-06-08 7:18 ` RFC: remove usb_device pointer from usb_skeleton.c Stefani Seibold
2012-06-08 8:28 ` Oliver Neukum [this message]
2012-06-08 13:46 ` Alan Stern
2012-06-06 16:27 ` [PATCH 05/11] remove unneeded forward declaration stefani
2012-06-06 16:27 ` [PATCH 06/11] introduce fsync function stefani
2012-06-06 16:27 ` [PATCH 07/11] remove pr_err() noise in skel_open stefani
2012-06-06 16:27 ` [PATCH 08/11] Handle a non blocking read without blocking stefani
2012-06-06 16:27 ` [PATCH 09/11] Synchronize disconnect() handler with open() and release(), to fix races stefani
2012-06-06 16:27 ` [PATCH 10/11] Introduce single user mode stefani
2012-06-06 16:27 ` [PATCH 11/11] Bump version number and add aditional author stefani
2012-06-06 16:55 ` [PATCH] fix usb skeleton driver Alan Stern
2012-06-06 17:53 ` Stefani Seibold
2012-06-06 18:16 ` Alan Stern
2012-06-06 20:19 ` Stefani Seibold
2012-06-06 20:22 ` Alan Stern
2012-06-07 8:13 ` Stefani Seibold
2012-06-07 7:10 ` Bjørn Mork
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