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,
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?
> ---
> 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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