From: Greg KH <greg@kroah.com>
To: "Emilio G. Cota" <cota@braap.org>,
Martyn Welch <martyn.welch@ge.com>,
"devel@driverdev.osuosl.org" <devel@driverdev.osuosl.org>,
Greg KH <gregkh@suse.de>, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 5/8] staging: vme: add functions for bridge module refcounting
Date: Mon, 8 Aug 2011 11:04:00 -0700 [thread overview]
Message-ID: <20110808180400.GA17257@kroah.com> (raw)
In-Reply-To: <20110808172216.GA2311@flamenco.cs.columbia.edu>
On Mon, Aug 08, 2011 at 01:22:16PM -0400, Emilio G. Cota wrote:
> On Mon, Aug 08, 2011 at 12:06:37 +0100, Martyn Welch wrote:
> > On 08/08/11 11:11, Emilio G. Cota wrote:
> > > On Mon, Aug 08, 2011 at 10:26:50 +0100, Martyn Welch wrote:
> > >> On 08/08/11 10:14, Emilio G. Cota wrote:
> > >>> Martyn, no one in the kernel is doing what you propose, for
> > >>> good reason. Look at USB, PCI, RapidIO. They all provide get
> > >>> and put functions to be called from probe and release.
> > >>
> > >> Really, which functions are these for PCI?
> > >
> > > pci_get_dev/put in drivers/pci/pci-driver.c.
> > >
> >
> > Which isn't explicitly used by the vast majority of PCI drivers. In fact the
> > instances which I did find where this was used by a PCI device driver, it
> > appears to be using the old-style PCI probing.
>
> > This is taken care of automatically for drivers using the "newer" PCI driver
> > registration model as part of the probe.
All PCI drivers are using that model, it is not "new" at all (5+ years
old now.)
The fact is, if you grab a pointer to a device, and save it somewhere,
you HAVE TO grab a reference to that object at the same time.
To not do so is a bug, and must be fixed.
It's that simple.
greg k-h
next prev parent reply other threads:[~2011-08-08 18:04 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-01 10:20 [PATCH 0/8] VME Driver Fixes Manohar Vanga
2011-08-01 10:20 ` [PATCH 1/8] staging: vme_user: change kmalloc+memset to kzalloc Manohar Vanga
2011-08-01 10:52 ` Martyn Welch
2011-08-10 7:44 ` Martyn Welch
2011-08-01 10:20 ` [PATCH 2/8] staging: vme: allow explicit assignment of bus numbers Manohar Vanga
2011-08-01 11:10 ` Dan Carpenter
2011-08-01 12:12 ` Manohar Vanga
2011-08-01 13:06 ` Martyn Welch
2011-08-01 14:31 ` Manohar Vanga
2011-08-01 15:50 ` Martyn Welch
2011-08-02 11:54 ` Manohar Vanga
2011-08-02 14:57 ` Martyn Welch
2011-08-03 8:54 ` Martyn Welch
2011-08-04 9:16 ` Manohar Vanga
2011-08-01 10:20 ` [PATCH 3/8] staging: vme: make [alloc|free]_consistent bridge specific Manohar Vanga
2011-08-01 11:10 ` Dan Carpenter
2011-08-01 12:24 ` Manohar Vanga
2011-08-01 13:41 ` Martyn Welch
2011-08-01 13:40 ` Manohar Vanga
2011-08-01 14:00 ` Manohar Vanga
2011-08-01 14:05 ` Martyn Welch
2011-08-01 10:20 ` [PATCH 4/8] staging: vme: keep track of registered buses Manohar Vanga
2011-08-01 10:20 ` [PATCH 5/8] staging: vme: add functions for bridge module refcounting Manohar Vanga
2011-08-03 14:04 ` Martyn Welch
2011-08-03 14:06 ` Manohar Vanga
2011-08-03 15:23 ` Emilio G. Cota
2011-08-04 7:23 ` Martyn Welch
2011-08-04 16:34 ` Emilio G. Cota
2011-08-05 7:45 ` Martyn Welch
2011-08-05 9:04 ` Manohar Vanga
2011-08-05 9:24 ` Martyn Welch
2011-08-05 17:47 ` Emilio G. Cota
2011-08-08 8:01 ` Martyn Welch
2011-08-08 9:14 ` Emilio G. Cota
2011-08-08 9:42 ` Martyn Welch
[not found] ` <4E3FABDA.8080204@ge.com>
[not found] ` <20110808101140.GA21300@flamenco.cs.columbia.edu>
2011-08-08 11:06 ` Martyn Welch
2011-08-08 17:22 ` Emilio G. Cota
2011-08-08 18:04 ` Greg KH [this message]
2011-08-09 9:00 ` Martyn Welch
2011-08-09 19:19 ` Emilio G. Cota
2011-08-10 7:39 ` Martyn Welch
2011-08-10 9:15 ` Emilio G. Cota
2011-08-10 9:50 ` Martyn Welch
2011-08-10 18:35 ` Emilio G. Cota
2011-08-09 13:24 ` Manohar Vanga
2011-08-09 14:26 ` Martyn Welch
2011-08-09 14:35 ` Manohar Vanga
2011-08-09 15:05 ` Martyn Welch
2011-08-09 18:49 ` Emilio G. Cota
2011-08-10 6:52 ` Manohar Vanga
2011-08-01 10:20 ` [PATCH 6/8] staging: vme: rename *_slot_get to *_get_slot Manohar Vanga
2011-08-01 12:29 ` Martyn Welch
2011-08-01 12:31 ` Manohar Vanga
2011-08-09 15:18 ` Martyn Welch
2011-08-09 15:25 ` Greg KH
2011-08-09 15:32 ` Manohar Vanga
2011-08-01 10:20 ` [PATCH 7/8] staging: vme: add struct vme_dev for VME devices Manohar Vanga
2011-08-09 15:19 ` Martyn Welch
2011-08-01 10:20 ` [PATCH 8/8] staging: vme: make match() driver specific to improve non-VME64x support Manohar Vanga
2011-08-03 9:16 ` Martyn Welch
2011-08-03 12:18 ` Manohar Vanga
2011-08-01 14:29 ` [PATCH 0/8] VME Driver Fixes Martyn Welch
2011-08-01 14:32 ` Manohar Vanga
2011-08-23 22:07 ` Greg KH
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