From: "Michael Büsch" <m@bues.ch>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Joerg Roedel <joerg.roedel@amd.com>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Kernel development list <linux-kernel@vger.kernel.org>
Subject: Re: Incorrect uses of get_driver()/put_driver()
Date: Mon, 9 Jan 2012 19:03:21 +0100 [thread overview]
Message-ID: <20120109190321.537038bc@milhouse> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1201091202090.1541-100000@iolanthe.rowland.org>
On Mon, 9 Jan 2012 12:35:09 -0500 (EST)
Alan Stern <stern@rowland.harvard.edu> wrote:
> drivers/ssb/main.c:146: get_driver(&drv->drv);
> drivers/ssb/main.c:153: put_driver(&drv->drv);
>
> Michael, these are part of ssb_driver_get() and ssb_driver_put(), used
> in ssb_devices_freeze() and ssb_devices_thaw(). They don't currently
> do anything, but it looks as if they are meant to prevent the driver
> from being unloaded. Should they be replaced with try_module_get()?
> Or would it be good enough to call device_attach() in
> ssb_devices_thaw()?
Hm, It seems that this code is trying to pin the ssb_driver, so that
it doesn't become invalid during the freeze period. So it most likely wants
to protect against module unload and driver unbind here. Not sure
if that actually works, though :/
--
Greetings, Michael.
next prev parent reply other threads:[~2012-01-09 18:03 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-05 16:31 Problems with get_driver() and driver_attach() (and new_id too) Alan Stern
2012-01-05 18:01 ` Dmitry Torokhov
2012-01-05 18:55 ` Alan Stern
2012-01-05 20:05 ` Dmitry Torokhov
2012-01-05 20:48 ` Alan Stern
2012-01-05 23:17 ` Greg KH
2012-01-06 14:42 ` Alan Stern
2012-01-06 15:42 ` Alan Stern
2012-01-06 20:29 ` Alan Stern
2012-01-09 8:48 ` Dmitry Torokhov
2012-01-09 16:37 ` Alan Stern
2012-01-09 16:50 ` Dmitry Torokhov
2012-01-09 17:01 ` Alan Stern
2012-01-09 17:05 ` Dmitry Torokhov
2012-01-09 17:35 ` Incorrect uses of get_driver()/put_driver() Alan Stern
2012-01-09 17:48 ` Konrad Rzeszutek Wilk
2012-01-09 18:20 ` Dmitry Torokhov
2012-01-09 18:34 ` Konrad Rzeszutek Wilk
2012-01-09 18:49 ` Dmitry Torokhov
2012-01-09 19:36 ` Alan Stern
2012-01-09 18:03 ` Michael Büsch [this message]
2012-01-09 18:14 ` Dmitry Torokhov
2012-01-09 19:48 ` Alan Stern
2012-01-09 20:07 ` Michael Büsch
2012-01-09 22:44 ` Alan Stern
2012-01-09 23:05 ` Michael Büsch
2012-01-09 18:04 ` Joerg Roedel
2012-01-10 9:05 ` Martin Schwidefsky
2012-01-10 9:20 ` Dmitry Torokhov
2012-01-10 10:03 ` Martin Schwidefsky
2012-01-10 10:18 ` Sebastian Ott
2012-01-10 10:21 ` Sebastian Ott
2012-01-10 20:32 ` Alan Stern
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