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From: Greg KH <gregkh@linuxfoundation.org>
To: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>,
	Ranjani Sridharan <ranjani.sridharan@linux.intel.com>,
	Jeff Kirsher <jeffrey.t.kirsher@intel.com>,
	davem@davemloft.net, netdev@vger.kernel.org,
	linux-rdma@vger.kernel.org, nhorman@redhat.com,
	sassmann@redhat.com, Fred Oh <fred.oh@linux.intel.com>
Subject: Re: [net-next v4 10/12] ASoC: SOF: Introduce descriptors for SOF client
Date: Sun, 24 May 2020 08:35:19 +0200
Message-ID: <20200524063519.GB1369260@kroah.com> (raw)
In-Reply-To: <57185aae-e1c9-4380-7801-234a13deebae@linux.intel.com>

On Sat, May 23, 2020 at 02:41:51PM -0500, Pierre-Louis Bossart wrote:
> 
> 
> On 5/23/20 1:23 AM, Greg KH wrote:
> > On Fri, May 22, 2020 at 09:29:57AM -0500, Pierre-Louis Bossart wrote:
> > > This is not an hypothetical case, we've had this recurring problem when a
> > > PCI device creates an audio card represented as a platform device. When the
> > > card registration fails, typically due to configuration issues, the PCI
> > > probe still completes.
> > 
> > Then fix that problem there.  The audio card should not be being created
> > as a platform device, as that is not what it is.  And even if it was,
> > the probe should not complete, it should clean up after itself and error
> > out.
> 
> Did you mean 'the PCI probe should not complete and error out'?

Yes.

> If yes, that's yet another problem... During the PCI probe, we start a
> workqueue and return success to avoid blocking everything.

That's crazy.

> And only 'later' do we actually create the card. So that's two levels
> of probe that cannot report a failure. I didn't come up with this
> design, IIRC this is due to audio-DRM dependencies and it's been used
> for 10+ years.

Then if the probe function fails, it needs to unwind everything itself
and unregister the device with the PCI subsystem so that things work
properly.  If it does not do that today, that's a bug.

What kind of crazy dependencies cause this type of "requirement"?

thanks,

greg k-h

  reply index

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-20  7:02 [net-next v4 00/12][pull request] 100GbE Intel Wired LAN Driver Updates 2020-05-19 Jeff Kirsher
2020-05-20  7:02 ` [net-next v4 01/12] Implementation of Virtual Bus Jeff Kirsher
2020-05-21 14:57   ` Parav Pandit
2020-05-21 17:43     ` gregkh
2020-05-21 20:10       ` Jason Gunthorpe
2020-05-20  7:02 ` [net-next v4 02/12] ice: Create and register virtual bus for RDMA Jeff Kirsher
2020-05-20  7:02 ` [net-next v4 03/12] ice: Complete RDMA peer registration Jeff Kirsher
2020-05-20  7:02 ` [net-next v4 04/12] ice: Support resource allocation requests Jeff Kirsher
2020-05-20  7:02 ` [net-next v4 05/12] ice: Enable event notifications Jeff Kirsher
2020-05-20  7:02 ` [net-next v4 06/12] ice: Allow reset operations Jeff Kirsher
2020-05-20  7:02 ` [net-next v4 07/12] ice: Pass through communications to VF Jeff Kirsher
2020-05-20  7:02 ` [net-next v4 08/12] i40e: Move client header location Jeff Kirsher
2020-05-20  7:02 ` [net-next v4 09/12] i40e: Register a virtbus device to provide RDMA Jeff Kirsher
2020-05-20  7:02 ` [net-next v4 10/12] ASoC: SOF: Introduce descriptors for SOF client Jeff Kirsher
2020-05-20  7:20   ` Greg KH
2020-05-20 12:54   ` Jason Gunthorpe
2020-05-20 12:57     ` Jason Gunthorpe
2020-05-21 21:11     ` Ranjani Sridharan
2020-05-21 23:34       ` Jason Gunthorpe
2020-05-22 14:29         ` Pierre-Louis Bossart
2020-05-22 14:55           ` Jason Gunthorpe
2020-05-22 15:33             ` Pierre-Louis Bossart
2020-05-22 17:10               ` Jason Gunthorpe
2020-05-22 18:35                 ` Pierre-Louis Bossart
2020-05-22 18:40                   ` Jason Gunthorpe
2020-05-22 18:48                     ` Pierre-Louis Bossart
2020-05-22 19:44                       ` Jason Gunthorpe
2020-05-22 21:05                         ` Pierre-Louis Bossart
2020-05-23  6:23           ` Greg KH
2020-05-23 19:41             ` Pierre-Louis Bossart
2020-05-24  6:35               ` Greg KH [this message]
2020-05-26 13:15                 ` Pierre-Louis Bossart
2020-05-26 13:37                   ` Takashi Iwai
2020-05-27  7:17                     ` Greg KH
2020-05-27 14:05                       ` Pierre-Louis Bossart
2020-05-25 16:55               ` Jason Gunthorpe
2020-05-20  7:02 ` [net-next v4 11/12] ASoC: SOF: Create client driver for IPC test Jeff Kirsher
2020-05-20  7:22   ` Greg KH
2020-05-20 12:56   ` Jason Gunthorpe
2020-05-27 20:18     ` Ranjani Sridharan
2020-05-28  0:12       ` Jason Gunthorpe
2020-05-28  1:40         ` Ranjani Sridharan
2020-05-28 10:45           ` Greg KH
2020-05-20  7:02 ` [net-next v4 12/12] ASoC: SOF: ops: Add new op for client registration Jeff Kirsher
2020-05-20  7:23   ` Greg KH
2020-05-20  7:17 ` [net-next v4 00/12][pull request] 100GbE Intel Wired LAN Driver Updates 2020-05-19 Greg KH
2020-05-20  7:25   ` Kirsher, Jeffrey T
2020-05-20  9:08     ` Greg KH

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