On Thu, Sep 01, 2016 at 01:23:45PM -0500, Bjorn Helgaas wrote:
> On Mon, Aug 08, 2016 at 03:05:37PM +0200, Tomasz Nowicki wrote:
> > pci_config_window keeps pointer to pci_ecam_ops and every time
> > we want to deallocate pci_config_window (pci_ecam_free()) we need to make
> > sure to free pci_ecam_ops in case it was dynamically allocated prior to
> > pci_ecam_create() call.
>
> I think this is a theoretical problem, right? All the current callers
> pass a pointer to a static pci_ecam_ops struct that does not need to
> be deallocated.
>
> I see that the next patch uses a pci_ecam_ops struct on the stack,
I asked Tomasz why we need to have pci_ecam_ops on the stack in the
first place since I do not think it is needed, or nicer (actually I
think it is not nice at all, what's the problem in making it static ?).
Anyway, that's part of this thread but I think Tomasz was looking
more for feedback/agreement on the whole quirks mechanism to check
if it is fine, more below.
> which would definitely cause issues without this patch, so I agree we
> need something like this; I'm just trying to make the changelog make
> more sense.
>
> > To avoid that extra effort, embed pci_ecam_ops in pci_config_window,
> > instead of just a pointer.
> >
> > Signed-off-by: Tomasz Nowicki <tn@xxxxxxxxxxxx>
> > To: Jayachandran C <jchandra@xxxxxxxxxxxx>
>
> This looks like an editing mistake?
Yes it is.
I think the most important bit about this series is to agree on
whether it is ok to keep quirks in drivers/pci/host/mcfg-quirks.c
or we need to find a different dir for it, and of course to make
sure the quirks mechanism is fine with everyone.
Thanks !
Lorenzo
> > arch/arm64/kernel/pci.c | 2 +-
> > drivers/pci/ecam.c | 6 +++---
> > include/linux/pci-ecam.h | 2 +-
> > 3 files changed, 5 insertions(+), 5 deletions(-)
> >
> > diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
> > index acf3872..981e828 100644
> > --- a/arch/arm64/kernel/pci.c
> > +++ b/arch/arm64/kernel/pci.c
> > @@ -183,7 +183,7 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
> > return NULL;
> > }
> >
> > - acpi_pci_root_ops.pci_ops = &ri->cfg->ops->pci_ops;
> > + acpi_pci_root_ops.pci_ops = &ri->cfg->ops.pci_ops;
> > bus = acpi_pci_root_create(root, &acpi_pci_root_ops, &ri->common,
> > ri->cfg);
> > if (!bus)
> > diff --git a/drivers/pci/ecam.c b/drivers/pci/ecam.c
> > index 43ed08d..24242f0 100644
> > --- a/drivers/pci/ecam.c
> > +++ b/drivers/pci/ecam.c
> > @@ -52,7 +52,7 @@ struct pci_config_window *pci_ecam_create(struct device *dev,
> > return ERR_PTR(-ENOMEM);
> >
> > cfg->parent = dev;
> > - cfg->ops = ops;
> > + cfg->ops = *ops;
> > cfg->busr.start = busr->start;
> > cfg->busr.end = busr->end;
> > cfg->busr.flags = IORESOURCE_BUS;
> > @@ -138,7 +138,7 @@ void __iomem *pci_ecam_map_bus(struct pci_bus *bus, unsigned int devfn,
> > int where)
> > {
> > struct pci_config_window *cfg = bus->sysdata;
> > - unsigned int devfn_shift = cfg->ops->bus_shift - 8;
> > + unsigned int devfn_shift = cfg->ops.bus_shift - 8;
> > unsigned int busn = bus->number;
> > void __iomem *base;
> >
> > @@ -149,7 +149,7 @@ void __iomem *pci_ecam_map_bus(struct pci_bus *bus, unsigned int devfn,
> > if (per_bus_mapping)
> > base = cfg->winp[busn];
> > else
> > - base = cfg->win + (busn << cfg->ops->bus_shift);
> > + base = cfg->win + (busn << cfg->ops.bus_shift);
> > return base + (devfn << devfn_shift) + where;
> > }
> >
> > diff --git a/include/linux/pci-ecam.h b/include/linux/pci-ecam.h
> > index 7adad20..0ce2920 100644
> > --- a/include/linux/pci-ecam.h
> > +++ b/include/linux/pci-ecam.h
> > @@ -39,7 +39,7 @@ struct pci_config_window {
> > struct resource res;
> > struct resource busr;
> > void *priv;
> > - struct pci_ecam_ops *ops;
> > + struct pci_ecam_ops ops;
> > union {
> > void __iomem *win; /* 64-bit single mapping */
> > void __iomem **winp; /* 32-bit per-bus mapping */
> > --
> > 1.9.1
> >
>
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