Subject: Re: [patch V3 00/35] genirq/msi, PCI/MSI: Spring cleaning - Part 2

From: Thomas Gleixner <[email-masked]>
Date: Tue, 14 Dec 2021 18:03:50 +0100

On Tue, Dec 14 2021 at 17:36, Thomas Gleixner wrote:
> On Tue, Dec 14 2021 at 10:22, Nishanth Menon wrote:
>> On 10:41-20211214, Thomas Gleixner wrote:
> [   13.478122] Call trace:
> [   13.509042]  msi_device_destroy_sysfs+0x18/0x88
> [   13.509058]  msi_domain_free_irqs+0x34/0x58
> [   13.509064]  pci_msi_teardown_msi_irqs+0x30/0x3c
> [   13.509072]  free_msi_irqs+0x78/0xd4
> [   13.509077]  pci_disable_msix+0x138/0x164
> [   13.529930]  pcim_release+0x70/0x238
> [   13.529942]  devres_release_all+0x9c/0xfc
> [   13.529951]  device_release_driver_internal+0x1a0/0x244
> [   13.542725]  device_release_driver+0x18/0x24
> [   13.542741]  iwl_req_fw_callback+0x1a28/0x1ddc [iwlwifi]
> [   13.552308]  request_firmware_work_func+0x50/0x9c
> [   13.552320]  process_one_work+0x194/0x25c
>
> That's not a driver problem, that's an ordering issue vs. the devres
> muck. Let me go back to the drawing board. Sigh...

Which is pretty obvious why:

   pcim_enable_device()
        devres_alloc(pcim_release...);
        ...
        pci_irq_alloc()
          msi_setup_device_data()
             devres_alloc(msi_device_data_release, ...)

and once the device is released:

    msi_device_data_release()
    ...
    pcim_release()
       pci_disable_msi[x]()

Groan....

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