On Thu, 2024-06-13 at 20:19 +0300, Ilpo Järvinen wrote:
> On Wed, 5 Jun 2024, Philipp Stanner wrote:
>
> > Managing pci_set_mwi() with devres can easily be done with its own
> > callback, without the necessity to store any state about it in a
> > device-related struct.
> >
> > Remove the MWI state from struct pci_devres.
> > Give pcim_set_mwi() a separate devres-callback.
> >
> > Signed-off-by: Philipp Stanner <pstanner@xxxxxxxxxx>
> > ---
> > drivers/pci/devres.c | 29 ++++++++++++++++++-----------
> > drivers/pci/pci.h | 1 -
> > 2 files changed, 18 insertions(+), 12 deletions(-)
> >
> > diff --git a/drivers/pci/devres.c b/drivers/pci/devres.c
> > index 936369face4b..0bafb67e1886 100644
> > --- a/drivers/pci/devres.c
> > +++ b/drivers/pci/devres.c
> > @@ -361,24 +361,34 @@ void __iomem
> > *devm_pci_remap_cfg_resource(struct device *dev,
> > }
> > EXPORT_SYMBOL(devm_pci_remap_cfg_resource);
> >
> > +static void __pcim_clear_mwi(void *pdev_raw)
> > +{
> > + struct pci_dev *pdev = pdev_raw;
> > +
> > + pci_clear_mwi(pdev);
> > +}
> > +
> > /**
> > * pcim_set_mwi - a device-managed pci_set_mwi()
> > - * @dev: the PCI device for which MWI is enabled
> > + * @pdev: the PCI device for which MWI is enabled
> > *
> > * Managed pci_set_mwi().
> > *
> > * RETURNS: An appropriate -ERRNO error value on error, or zero
> > for success.
> > */
> > -int pcim_set_mwi(struct pci_dev *dev)
> > +int pcim_set_mwi(struct pci_dev *pdev)
> > {
> > - struct pci_devres *dr;
> > + int ret;
> >
> > - dr = find_pci_dr(dev);
> > - if (!dr)
> > - return -ENOMEM;
> > + ret = devm_add_action(&pdev->dev, __pcim_clear_mwi, pdev);
> > + if (ret != 0)
> > + return ret;
> > +
> > + ret = pci_set_mwi(pdev);
> > + if (ret != 0)
> > + devm_remove_action(&pdev->dev, __pcim_clear_mwi,
> > pdev);
>
> I'm sorry if this is a stupid question but why this cannot use
> devm_add_action_or_reset()?
For MWI that could be done.
This is basically just consistent with the new pcim_enable_device() in
patch No.11 where devm_add_action_or_reset() could collide with
pcim_pin_device().
We could squash usage of devm_add_action_or_reset() in here. I don't
care.
P.
>
> > - dr->mwi = 1;
> > - return pci_set_mwi(dev);
> > + return ret;
> > }
> > EXPORT_SYMBOL(pcim_set_mwi);
>
