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From: Mark Brown <broonie@kernel.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, gregkh@linuxfoundation.org,
	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: Mon, 29 Jun 2020 21:59:10 +0100	[thread overview]
Message-ID: <20200629205910.GO5499@sirena.org.uk> (raw)
In-Reply-To: <6e129db7-2a76-bc67-0e56-2abb4d9761a3@linux.intel.com>

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On Fri, May 22, 2020 at 10:33:20AM -0500, Pierre-Louis Bossart wrote:
> On 5/22/20 9:55 AM, Jason Gunthorpe wrote:

> > Maybe not great, but at least it is consistent with all the lifetime
> > models and the operation of the driver core.

> I agree your comments are valid ones, I just don't have a solution to be
> fully compliant with these models and report failures of the driver probe
> for a child device due to configuration issues (bad audio topology, etc).

> My understanding is that errors on probe are explicitly not handled in the
> driver core, see e.g. comments such as:

It's just not an error for a child device to not instantiate, we don't
even know if the driver is loaded yet.  The parent really should not
care if the child is there or not.

> > > 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. That's really confusing and the source of lots of
> > > support questions. If we use these virtual bus extensions to stpo abusing
> > > platform devices, it'd be really nice to make those unreported probe
> > > failures go away.

> > I think you need to address this in some other way that is hot plug
> > safe.

> > Surely you can make this failure visible to users in some other way?

> Not at the moment, no. there are no failures reported in dmesg, and the user
> does not see any card created. This is a silent error.

If we're failing to do something we should report it.  This includes
deferred probe failures.

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  parent reply	other threads:[~2020-06-29 20:59 UTC|newest]

Thread overview: 69+ 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
2020-06-29 20:59               ` Mark Brown [this message]
2020-05-23  6:23           ` Greg KH
2020-05-23 19:41             ` Pierre-Louis Bossart
2020-05-24  6:35               ` Greg KH
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
2020-06-29 20:33                       ` Mark Brown
2020-06-29 22:59                         ` Jason Gunthorpe
2020-06-29 23:13                           ` Kirsher, Jeffrey T
2020-06-30 10:31                           ` Mark Brown
2020-06-30 11:32                             ` Jason Gunthorpe
2020-06-30 14:16                               ` Mark Brown
2020-06-30 17:24                               ` Ranjani Sridharan
2020-06-30 17:27                                 ` Jason Gunthorpe
2020-07-01  9:50                                   ` Mark Brown
2020-07-01 23:32                                     ` Jason Gunthorpe
2020-07-02 11:15                                       ` Mark Brown
2020-07-02 12:11                                         ` Jason Gunthorpe
2020-07-02 12:20                                           ` Mark Brown
2020-07-01  6:59                                 ` Greg KH
2020-07-02 13:43                                   ` Ranjani Sridharan
2020-07-06 23:02                                     ` Dan Williams
2020-07-07 14:16                                       ` Greg KH
2020-05-25 16:55               ` Jason Gunthorpe
2020-06-29 20:21             ` Mark Brown
2020-06-29 17:36   ` Mark Brown
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
2020-06-29 20:37             ` Mark Brown
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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