linux-kernel - Re: [PATCH 1/2] PCI: Use software node API with additional device properties

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Message-ID: <b3e3e9a3-c430-db98-9e6d-0e3526ddc6f7@linaro.org>
Date:   Thu, 30 Sep 2021 10:33:27 +0800
From:   Zhangfei Gao <zhangfei.gao@...aro.org>
To:     Bjorn Helgaas <helgaas@...nel.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH 1/2] PCI: Use software node API with additional device
 properties



On 2021/9/30 上午1:08, Bjorn Helgaas wrote:
> [+cc Zhangfei, author of 8304a3a199ee ("PCI: Set dma-can-stall for
> HiSilicon chips"), which added this]
>
> On Wed, Sep 29, 2021 at 04:37:28PM +0300, Heikki Krogerus wrote:
>> Using device_create_managed_software_node() to inject the
>> properties in quirk_huawei_pcie_sva() instead of with the
>> old device_add_properties() API.
>>
>> Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> This is fine with me, but please update the subject line and commit
> log something like this:
>
>    PCI: Convert to device_create_managed_software_node()
>
>    In quirk_huawei_pcie_sva(), use device_create_managed_software_node()
>    instead of device_add_properties() to set the "dma-can-stall"
>    property.
>
>    This resolves a software node lifetime issue (see 151f6ff78cdf
>    ("software node: Provide replacement for device_add_properties()"))
>    and paves the way for removing device_add_properties() completely.
>
> Actually, 8304a3a199ee was merged during the v5.15 merge window, so if
> this does in fact fix a lifetime issue, I can merge this before
> v5.15-final.
>
> I know *this* quirk applies to AMBA devices, and I assume they cannot
> be removed, so there's no actual lifetime problem in this particular
> case, but in general it looks like a problem for PCI devices.
Thanks Bjorn
This patch also works, though the quirk is for platform devices and not 
removed.

Acked-by: Zhangfei Gao <zhangfei.gao@...aro.org>
>
>> ---
>>   drivers/pci/quirks.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
>> index b6b4c803bdc94..fe5eedba47908 100644
>> --- a/drivers/pci/quirks.c
>> +++ b/drivers/pci/quirks.c
>> @@ -1850,7 +1850,7 @@ static void quirk_huawei_pcie_sva(struct pci_dev *pdev)
>>   	 * can set it directly.
>>   	 */
>>   	if (!pdev->dev.of_node &&
>> -	    device_add_properties(&pdev->dev, properties))
>> +	    device_create_managed_software_node(&pdev->dev, properties, NULL))
>>   		pci_warn(pdev, "could not add stall property");
>>   }
>>   DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_HUAWEI, 0xa250, quirk_huawei_pcie_sva);
>> -- 
>> 2.33.0
>>