linux-kernel - Re: [PATCH] rt2x00pci: Disable memory-write-invalidate when the driver exits

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Message-ID: <CAGXE3d_VE-OoYz8N2wUZo-T_wKNRPTPPhOc773UaGeqDkc1z_A@mail.gmail.com>
Date:	Tue, 5 Jan 2016 11:17:56 +0100
From:	Helmut Schaa <helmut.schaa@...glemail.com>
To:	Jia-Ju Bai <baijiaju1990@....com>
Cc:	Stanislaw Gruszka <sgruszka@...hat.com>, kvalo@...eaurora.org,
	linux-wireless <linux-wireless@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] rt2x00pci: Disable memory-write-invalidate when the
 driver exits

On Tue, Jan 5, 2016 at 2:27 AM, Jia-Ju Bai <baijiaju1990@....com> wrote:
> On 01/05/2016 12:50 AM, Helmut Schaa wrote:
>>
>> On Mon, Jan 4, 2016 at 8:55 AM, Jia-Ju Bai<baijiaju1990@....com>  wrote:
>>>
>>> The driver calls pci_set_mwi to enable memory-write-invalidate when it
>>> is initialized, but does not call pci_clear_mwi when it is removed. Many
>>> other drivers calls pci_clear_mwi when pci_set_mwi is called, such as
>>> r8169, 8139cp and e1000.
>>>
>>> This patch adds pci_clear_mwi in error handling and removal procedure,
>>> which can fix the problem.
>>>
>>> Signed-off-by: Jia-Ju Bai<baijiaju1990@....com>
>>
>> Looks good to me.
>> Does this fix any actual issue?
>> If yes it might we worth to mention it in the commit message.
>> Helmut
>>
>
> Lacking pci_clear_mwi may cause a resource-release omission,
> but this omission may not cause obvious issues.
> For reliability, it is better to add pci_clear_mwi in the driver.
> Many other drivers do so, such as r8169, 8139cp and e1000.

Thanks for clarification, fine with me then.

Acked-by: Helmut Schaa <helmut.schaa@...glemail.com>
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