Re: [RFC PATCH 00/13] Remove implicit devres from pci_intx()

[Heiner Kallweit <hkallweit1@xxxxxxxxx>]

On 09.10.2024 10:35, Philipp Stanner wrote:
> Hi all,
> 
> this series removes a problematic feature from pci_intx(). That function
> sometimes implicitly uses devres for automatic cleanup. We should get
> rid of this implicit behavior.
> 
> To do so, a pci_intx() version that is always-managed, and one that is
> never-managed are provided. Then, all pci_intx() users are ported to the
> version they need. Afterwards, pci_intx() can be cleaned up and the
> users of the never-managed version be ported back to pci_intx().
> 
> This way we'd get this PCI API consistent again.
> 
AFAICS pci_intx() is used only by drivers which haven't been converted
to the pci_alloc_irq_vectors() API yet. Wouldn't it be better to do this
instead of trying to improve pci_intx()?
Eventually pci_intx() would have to be used in PCI core only.

> The last patch obviously reverts the previous patches that made drivers
> use pci_intx_unmanaged(). But this way it's easier to review and
> approve. It also makes sure that each checked out commit should provide
> correct behavior, not just the entire series as a whole.
> 
> Merge plan for this would be to enter through the PCI tree.
> 
> Please say so if you've got concerns with the general idea behind the
> RFC.
> 
> Regards,
> P.
> 
> Philipp Stanner (13):
>   PCI: Prepare removing devres from pci_intx()
>   ALSA: hda: hda_intel: Use always-managed version of pcim_intx()
>   drivers/xen: Use never-managed version of pci_intx()
>   net/ethernet: Use never-managed version of pci_intx()
>   net/ntb: Use never-managed version of pci_intx()
>   misc: Use never-managed version of pci_intx()
>   vfio/pci: Use never-managed version of pci_intx()
>   PCI: MSI: Use never-managed version of pci_intx()
>   ata: Use always-managed version of pci_intx()
>   staging: rts5280: Use always-managed version of pci_intx()
>   wifi: qtnfmac: use always-managed version of pcim_intx()
>   HID: amd_sfh: Use always-managed version of pcim_intx()
>   Remove devres from pci_intx()
> 
>  drivers/ata/ahci.c                            |  2 +-
>  drivers/ata/ata_piix.c                        |  2 +-
>  drivers/ata/pata_rdc.c                        |  2 +-
>  drivers/ata/sata_sil24.c                      |  2 +-
>  drivers/ata/sata_sis.c                        |  2 +-
>  drivers/ata/sata_uli.c                        |  2 +-
>  drivers/ata/sata_vsc.c                        |  2 +-
>  drivers/hid/amd-sfh-hid/amd_sfh_pcie.c        |  4 ++--
>  drivers/hid/amd-sfh-hid/sfh1_1/amd_sfh_init.c |  2 +-
>  .../wireless/quantenna/qtnfmac/pcie/pcie.c    |  2 +-
>  drivers/pci/devres.c                          | 24 +++----------------
>  drivers/pci/pci.c                             | 14 +----------
>  drivers/staging/rts5208/rtsx.c                |  2 +-
>  include/linux/pci.h                           |  1 +
>  sound/pci/hda/hda_intel.c                     |  2 +-
>  15 files changed, 18 insertions(+), 47 deletions(-)
>