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From: Jan Kiszka <jan.kiszka@siemens.com>
To: Sinan Kaya <okaya@codeaurora.org>, Bjorn Helgaas <helgaas@kernel.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
	linux-pci@vger.kernel.org,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 3/6] PCI: Introduce devm_of_pci_get_host_bridge_resources
Date: Wed, 2 May 2018 07:39:42 +0200	[thread overview]
Message-ID: <5dd1e93a-b85b-a3eb-08de-6989c6a782c2@siemens.com> (raw)
In-Reply-To: <5e218659-b512-b622-25e0-5bb5a8f4b87d@codeaurora.org>

On 2018-04-30 20:43, Sinan Kaya wrote:
> On 4/30/2018 2:40 PM, Bjorn Helgaas wrote:
>> On Sat, Apr 28, 2018 at 09:28:47AM +0200, Jan Kiszka wrote:
>>> On 2018-04-28 00:24, Bjorn Helgaas wrote:
>>>> On Tue, Apr 24, 2018 at 05:13:39PM +0200, Jan Kiszka wrote:
>>>>> From: Jan Kiszka <jan.kiszka@siemens.com>
>>>>>
>>>>> of_pci_get_host_bridge_resources allocates the resource structures it
>>>>> fills dynamically, but none of its callers care to release them so far.
>>>>> Rather than requiring everyone to do this explicitly, introduce a
>>>>> managed version of that service. This differs API-wise only in taking a
>>>>> reference to the associated device, rather than to the device tree node.
>>>>>
>>>>> As of_pci_get_host_bridge_resources is an exported interface, we cannot
>>>>> simply drop it at this point. After converting all in-tree users to the
>>>>> new API, we could phase out the unmanaged one over some grace period.
>>>>
>>>> It looks like it might be possible to split this into three or four
>>>> patches:
>>>>
>>>>   1) Factor __of_pci_get_host_bridge_resources() out of
>>>>      of_pci_get_host_bridge_resources()
>>>>
>>>>   2) Add struct device * argument
>>>>
>>>>   3) Convert pr_info() to dev_info()
>>>>
>>>>   4) Add devm_of_pci_get_host_bridge_resources()
>>>
>>> Will do. I'm even considering
>>>
>>> 5) mark of_pci_get_host_bridge_resources() __deprecated, due to the leak
>>>    and no remaining in-tree user - what do you think?
>>
>> Sounds good.
>>
>> It'd be nice if we had some guideline about deprecation -- whether we
>> actually need to mark things __deprecated, and then how long to wait
>> before actually removing them, but I don't see anything in
>> Documentation/.
> 
> I'm under the impression that we don't quite care about out-of-tree drivers.
> I have seen many times out-of-tree drivers to be broken due to API changes,
> renames or even parameter meaning change. 
> 
> If the plan is to remove the API, just remove the API today.

I've already sent a __deprecated patch on Monday [1], in v2 of this
series [2]. Please vote against that there, and I will replace it with a
complete removal of that API.

Thanks,
Jan

[1] https://lkml.org/lkml/2018/4/30/22
[2] https://lkml.org/lkml/2018/4/30/24

-- 
Siemens AG, Corporate Technology, CT RDA IOT SES-DE
Corporate Competence Center Embedded Linux

  reply	other threads:[~2018-05-02  5:40 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-24 15:13 [PATCH 0/6] PCI: leak fixes, removable generic PCI host, assorted stuff Jan Kiszka
2018-04-24 15:13 ` [PATCH 1/6] PCI: Make pci_get_new_domain_nr static Jan Kiszka
2018-04-25 16:27   ` Lorenzo Pieralisi
2018-04-25 17:21     ` Jan Kiszka
2018-04-24 15:13 ` [PATCH 2/6] PCI: Fix memory leak of devm_pci_alloc_host_bridge Jan Kiszka
2018-04-24 15:13 ` [PATCH 3/6] PCI: Introduce devm_of_pci_get_host_bridge_resources Jan Kiszka
2018-04-25 10:40   ` Jan Kiszka
2018-04-27 22:24   ` Bjorn Helgaas
2018-04-28  7:28     ` Jan Kiszka
2018-04-30 18:40       ` Bjorn Helgaas
2018-04-30 18:43         ` Sinan Kaya
2018-05-02  5:39           ` Jan Kiszka [this message]
2018-04-24 15:13 ` [PATCH 4/6] PCI: Convert of_pci_get_host_bridge_resources users to devm variant Jan Kiszka
2018-04-25 19:47   ` Jingoo Han
2018-04-24 15:13 ` [PATCH 5/6] PCI: Add support for unbinding the generic PCI host controller Jan Kiszka
2018-04-24 15:13 ` [PATCH 6/6] arm: Allow to enable PCI_DOMAINS manually Jan Kiszka
2018-04-25 17:54   ` Lorenzo Pieralisi
2018-04-26  7:19     ` Jan Kiszka
2018-04-27 22:16 ` [PATCH 0/6] PCI: leak fixes, removable generic PCI host, assorted stuff Bjorn Helgaas

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