linux-kernel - Re: [RFC PATCH] software node: Skip duplicated software

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Date:   Tue, 9 Nov 2021 10:23:52 -0500
From:   Qian Cai <quic_qiancai@...cinc.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
CC:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Felipe Balbi <balbi@...nel.org>, <linux-usb@...r.kernel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC PATCH] software node: Skip duplicated software_node sysfs

On Mon, Nov 08, 2021 at 11:43:54PM -0500, Qian Cai wrote:
> Then, which functions do you suggest to replace with
> fwnode_create_software_node()? In dwc3_host_init(),
> 
> int dwc3_host_init(struct dwc3 *dwc)
> {
> 	...
> 	xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
> 	...
> 	ret = platform_device_add(xhci);
> 
> I am wondering if that we could solve the problem by avoiding
> "xhci-hcd" string here which would unfortunately clash with
> xhci_plat_init() as mentioned before:

Okay, I suppose that name has to be "xhci-hcd" to match the dirver
name. Otherwise, the below path did not run to create "xhci-hcd"
either. I noticed that the regression was discussed a few months ago
and leave it as is.

https://lore.kernel.org/lkml/e9bc1397-99b7-a57e-4860-80d146848e2c@nxp.com/

Alternatively, we might revert the commit 434b73e61cc6
("iommu/arm-smmu-v3: Use device properties for pasid-num-bits")
started to use device_add_properties() in iort_named_component_init()
which probably does not look pretty either. I can't think of any other
ways to avoid refactoring at the moment.

> 
>   sysfs_create_link
>   software_node_notify
>   device_create_managed_software_node
>   iort_named_component_init
>   iort_iommu_configure_id
>   acpi_dma_configure_id
>   platform_dma_configure
>   really_probe.part.0
>   really_probe
>   __driver_probe_device
>   driver_probe_device
>   __driver_attach
>   bus_for_each_dev
>   driver_attach
>   bus_add_driver
>   driver_register
>   __platform_driver_register
>   xhci_plat_init
>   do_one_initcall
>   kernel_init_freeable
>   kernel_init
>   ret_from_fork