| Message ID | 1425868467-9667-22-git-send-email-wangyijing@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Mon, Mar 09, 2015 at 10:34:18AM +0800, Yijing Wang wrote: > Sometimes, we need to know the highest reserved > busnr for children bus. Because parent's > bus->busn_res could have padding in it. > This function return the max child busnr as > pci_scan_child_bus(). I'm not convinced about this one. The fact that it's only used by parisc lba_pci.c and acpiphp makes me suspicious that either they're doing something funny, or other drivers *should* be using it, too. > Signed-off-by: Yijing Wang <wangyijing@huawei.com> > Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> > Signed-off-by: Fengguang Wu <fengguang.wu@intel.com> > --- > drivers/pci/hotplug/acpiphp_glue.c | 29 +---------------------------- > drivers/pci/pci.c | 27 +++++++++++++++++++++++++-- > include/linux/pci.h | 2 +- > 3 files changed, 27 insertions(+), 31 deletions(-) > > diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c > index bcb90e4..84f2584 100644 > --- a/drivers/pci/hotplug/acpiphp_glue.c > +++ b/drivers/pci/hotplug/acpiphp_glue.c > @@ -397,33 +397,6 @@ static void cleanup_bridge(struct acpiphp_bridge *bridge) > acpi_unlock_hp_context(); > } > > -/** > - * acpiphp_max_busnr - return the highest reserved bus number under the given bus. > - * @bus: bus to start search with > - */ > -static unsigned char acpiphp_max_busnr(struct pci_bus *bus) > -{ > - struct pci_bus *tmp; > - unsigned char max, n; > - > - /* > - * pci_bus_max_busnr will return the highest > - * reserved busnr for all these children. > - * that is equivalent to the bus->subordinate > - * value. We don't want to use the parent's > - * bus->subordinate value because it could have > - * padding in it. > - */ > - max = bus->busn_res.start; > - > - list_for_each_entry(tmp, &bus->children, node) { > - n = pci_bus_max_busnr(tmp); > - if (n > max) > - max = n; > - } > - return max; > -} > - > static void acpiphp_set_acpi_region(struct acpiphp_slot *slot) > { > struct acpiphp_func *func; > @@ -489,7 +462,7 @@ static void enable_slot(struct acpiphp_slot *slot) > LIST_HEAD(add_list); > > acpiphp_rescan_slot(slot); > - max = acpiphp_max_busnr(bus); > + max = pci_bus_child_max_busnr(bus); > for (pass = 0; pass < 2; pass++) { > list_for_each_entry(dev, &bus->devices, bus_list) { > if (PCI_SLOT(dev->devfn) != slot->device) > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > index c49eec1..0001896 100644 > --- a/drivers/pci/pci.c > +++ b/drivers/pci/pci.c > @@ -108,7 +108,7 @@ static bool pcie_ari_disabled; > * Given a PCI bus, returns the highest PCI bus number present in the set > * including the given PCI bus and its list of child PCI buses. > */ > -unsigned char pci_bus_max_busnr(struct pci_bus *bus) > +static unsigned char pci_bus_max_busnr(struct pci_bus *bus) > { > struct pci_bus *tmp; > unsigned char max, n; > @@ -121,7 +121,30 @@ unsigned char pci_bus_max_busnr(struct pci_bus *bus) > } > return max; > } > -EXPORT_SYMBOL_GPL(pci_bus_max_busnr); > + > +unsigned char pci_bus_child_max_busnr(struct pci_bus *bus) > +{ > + struct pci_bus *tmp; > + unsigned char max, n; > + > + /* > + * pci_bus_max_busnr will return the highest > + * reserved busnr for all these children. > + * that is equivalent to the bus->subordinate > + * value. We don't want to use the parent's > + * bus->subordinate value because it could have > + * padding in it. > + */ > + max = bus->busn_res.start; > + > + list_for_each_entry(tmp, &bus->children, node) { > + n = pci_bus_max_busnr(tmp); > + if (n > max) > + max = n; > + } > + return max; > +} > +EXPORT_SYMBOL_GPL(pci_bus_child_max_busnr); > > #ifdef CONFIG_HAS_IOMEM > void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar) > diff --git a/include/linux/pci.h b/include/linux/pci.h > index cfaf217..261b8de 100644 > --- a/include/linux/pci.h > +++ b/include/linux/pci.h > @@ -1181,7 +1181,7 @@ int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, > void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *), > void *userdata); > int pci_cfg_space_size(struct pci_dev *dev); > -unsigned char pci_bus_max_busnr(struct pci_bus *bus); > +unsigned char pci_bus_child_max_busnr(struct pci_bus *bus); > void pci_setup_bridge(struct pci_bus *bus); > resource_size_t pcibios_window_alignment(struct pci_bus *bus, > unsigned long type); > -- > 1.7.1 >
On Mon, Mar 09, 2015 at 10:34:18AM +0800, Yijing Wang wrote: > Sometimes, we need to know the highest reserved > busnr for children bus. Because parent's > bus->busn_res could have padding in it. > This function return the max child busnr as > pci_scan_child_bus(). > > Signed-off-by: Yijing Wang <wangyijing@huawei.com> > Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> > Signed-off-by: Fengguang Wu <fengguang.wu@intel.com> I must have screwed this up. I don't know where the Signed-off-by from Fengguang came from, but it shouldn't be there. And I also screwed up by adding my own Signed-off-by to the branch while we're still iterating on this series. The patches you post should not have my Signed-off-by in them; I should add that. But that's my fault because put them in the branch, and I asked you to pull that branch and modify and repost it. > --- > drivers/pci/hotplug/acpiphp_glue.c | 29 +---------------------------- > drivers/pci/pci.c | 27 +++++++++++++++++++++++++-- > include/linux/pci.h | 2 +- > 3 files changed, 27 insertions(+), 31 deletions(-) > > diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c > index bcb90e4..84f2584 100644 > --- a/drivers/pci/hotplug/acpiphp_glue.c > +++ b/drivers/pci/hotplug/acpiphp_glue.c > @@ -397,33 +397,6 @@ static void cleanup_bridge(struct acpiphp_bridge *bridge) > acpi_unlock_hp_context(); > } > > -/** > - * acpiphp_max_busnr - return the highest reserved bus number under the given bus. > - * @bus: bus to start search with > - */ > -static unsigned char acpiphp_max_busnr(struct pci_bus *bus) > -{ > - struct pci_bus *tmp; > - unsigned char max, n; > - > - /* > - * pci_bus_max_busnr will return the highest > - * reserved busnr for all these children. > - * that is equivalent to the bus->subordinate > - * value. We don't want to use the parent's > - * bus->subordinate value because it could have > - * padding in it. > - */ > - max = bus->busn_res.start; > - > - list_for_each_entry(tmp, &bus->children, node) { > - n = pci_bus_max_busnr(tmp); > - if (n > max) > - max = n; > - } > - return max; > -} > - > static void acpiphp_set_acpi_region(struct acpiphp_slot *slot) > { > struct acpiphp_func *func; > @@ -489,7 +462,7 @@ static void enable_slot(struct acpiphp_slot *slot) > LIST_HEAD(add_list); > > acpiphp_rescan_slot(slot); > - max = acpiphp_max_busnr(bus); > + max = pci_bus_child_max_busnr(bus); > for (pass = 0; pass < 2; pass++) { > list_for_each_entry(dev, &bus->devices, bus_list) { > if (PCI_SLOT(dev->devfn) != slot->device) > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > index c49eec1..0001896 100644 > --- a/drivers/pci/pci.c > +++ b/drivers/pci/pci.c > @@ -108,7 +108,7 @@ static bool pcie_ari_disabled; > * Given a PCI bus, returns the highest PCI bus number present in the set > * including the given PCI bus and its list of child PCI buses. > */ > -unsigned char pci_bus_max_busnr(struct pci_bus *bus) > +static unsigned char pci_bus_max_busnr(struct pci_bus *bus) > { > struct pci_bus *tmp; > unsigned char max, n; > @@ -121,7 +121,30 @@ unsigned char pci_bus_max_busnr(struct pci_bus *bus) > } > return max; > } > -EXPORT_SYMBOL_GPL(pci_bus_max_busnr); > + > +unsigned char pci_bus_child_max_busnr(struct pci_bus *bus) > +{ > + struct pci_bus *tmp; > + unsigned char max, n; > + > + /* > + * pci_bus_max_busnr will return the highest > + * reserved busnr for all these children. > + * that is equivalent to the bus->subordinate > + * value. We don't want to use the parent's > + * bus->subordinate value because it could have > + * padding in it. > + */ > + max = bus->busn_res.start; > + > + list_for_each_entry(tmp, &bus->children, node) { > + n = pci_bus_max_busnr(tmp); > + if (n > max) > + max = n; > + } > + return max; > +} > +EXPORT_SYMBOL_GPL(pci_bus_child_max_busnr); > > #ifdef CONFIG_HAS_IOMEM > void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar) > diff --git a/include/linux/pci.h b/include/linux/pci.h > index cfaf217..261b8de 100644 > --- a/include/linux/pci.h > +++ b/include/linux/pci.h > @@ -1181,7 +1181,7 @@ int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, > void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *), > void *userdata); > int pci_cfg_space_size(struct pci_dev *dev); > -unsigned char pci_bus_max_busnr(struct pci_bus *bus); > +unsigned char pci_bus_child_max_busnr(struct pci_bus *bus); > void pci_setup_bridge(struct pci_bus *bus); > resource_size_t pcibios_window_alignment(struct pci_bus *bus, > unsigned long type); > -- > 1.7.1 >
On 2015/3/12 11:33, Bjorn Helgaas wrote: > On Mon, Mar 09, 2015 at 10:34:18AM +0800, Yijing Wang wrote: >> Sometimes, we need to know the highest reserved >> busnr for children bus. Because parent's >> bus->busn_res could have padding in it. >> This function return the max child busnr as >> pci_scan_child_bus(). > > I'm not convinced about this one. The fact that it's only used by parisc > lba_pci.c and acpiphp makes me suspicious that either they're doing > something funny, or other drivers *should* be using it, too. Yes, what lba_pci.c do looks some strange, I did this patch just try to keep the original logic, but it seems to make code more complex, I would consider this again and try to find a better solution, thanks. > >> Signed-off-by: Yijing Wang <wangyijing@huawei.com> >> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> >> Signed-off-by: Fengguang Wu <fengguang.wu@intel.com> >> --- >> drivers/pci/hotplug/acpiphp_glue.c | 29 +---------------------------- >> drivers/pci/pci.c | 27 +++++++++++++++++++++++++-- >> include/linux/pci.h | 2 +- >> 3 files changed, 27 insertions(+), 31 deletions(-) >> >> diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c >> index bcb90e4..84f2584 100644 >> --- a/drivers/pci/hotplug/acpiphp_glue.c >> +++ b/drivers/pci/hotplug/acpiphp_glue.c >> @@ -397,33 +397,6 @@ static void cleanup_bridge(struct acpiphp_bridge *bridge) >> acpi_unlock_hp_context(); >> } >> >> -/** >> - * acpiphp_max_busnr - return the highest reserved bus number under the given bus. >> - * @bus: bus to start search with >> - */ >> -static unsigned char acpiphp_max_busnr(struct pci_bus *bus) >> -{ >> - struct pci_bus *tmp; >> - unsigned char max, n; >> - >> - /* >> - * pci_bus_max_busnr will return the highest >> - * reserved busnr for all these children. >> - * that is equivalent to the bus->subordinate >> - * value. We don't want to use the parent's >> - * bus->subordinate value because it could have >> - * padding in it. >> - */ >> - max = bus->busn_res.start; >> - >> - list_for_each_entry(tmp, &bus->children, node) { >> - n = pci_bus_max_busnr(tmp); >> - if (n > max) >> - max = n; >> - } >> - return max; >> -} >> - >> static void acpiphp_set_acpi_region(struct acpiphp_slot *slot) >> { >> struct acpiphp_func *func; >> @@ -489,7 +462,7 @@ static void enable_slot(struct acpiphp_slot *slot) >> LIST_HEAD(add_list); >> >> acpiphp_rescan_slot(slot); >> - max = acpiphp_max_busnr(bus); >> + max = pci_bus_child_max_busnr(bus); >> for (pass = 0; pass < 2; pass++) { >> list_for_each_entry(dev, &bus->devices, bus_list) { >> if (PCI_SLOT(dev->devfn) != slot->device) >> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c >> index c49eec1..0001896 100644 >> --- a/drivers/pci/pci.c >> +++ b/drivers/pci/pci.c >> @@ -108,7 +108,7 @@ static bool pcie_ari_disabled; >> * Given a PCI bus, returns the highest PCI bus number present in the set >> * including the given PCI bus and its list of child PCI buses. >> */ >> -unsigned char pci_bus_max_busnr(struct pci_bus *bus) >> +static unsigned char pci_bus_max_busnr(struct pci_bus *bus) >> { >> struct pci_bus *tmp; >> unsigned char max, n; >> @@ -121,7 +121,30 @@ unsigned char pci_bus_max_busnr(struct pci_bus *bus) >> } >> return max; >> } >> -EXPORT_SYMBOL_GPL(pci_bus_max_busnr); >> + >> +unsigned char pci_bus_child_max_busnr(struct pci_bus *bus) >> +{ >> + struct pci_bus *tmp; >> + unsigned char max, n; >> + >> + /* >> + * pci_bus_max_busnr will return the highest >> + * reserved busnr for all these children. >> + * that is equivalent to the bus->subordinate >> + * value. We don't want to use the parent's >> + * bus->subordinate value because it could have >> + * padding in it. >> + */ >> + max = bus->busn_res.start; >> + >> + list_for_each_entry(tmp, &bus->children, node) { >> + n = pci_bus_max_busnr(tmp); >> + if (n > max) >> + max = n; >> + } >> + return max; >> +} >> +EXPORT_SYMBOL_GPL(pci_bus_child_max_busnr); >> >> #ifdef CONFIG_HAS_IOMEM >> void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar) >> diff --git a/include/linux/pci.h b/include/linux/pci.h >> index cfaf217..261b8de 100644 >> --- a/include/linux/pci.h >> +++ b/include/linux/pci.h >> @@ -1181,7 +1181,7 @@ int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, >> void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *), >> void *userdata); >> int pci_cfg_space_size(struct pci_dev *dev); >> -unsigned char pci_bus_max_busnr(struct pci_bus *bus); >> +unsigned char pci_bus_child_max_busnr(struct pci_bus *bus); >> void pci_setup_bridge(struct pci_bus *bus); >> resource_size_t pcibios_window_alignment(struct pci_bus *bus, >> unsigned long type); >> -- >> 1.7.1 >> > > . >
On 2015/3/12 11:36, Bjorn Helgaas wrote: > On Mon, Mar 09, 2015 at 10:34:18AM +0800, Yijing Wang wrote: >> Sometimes, we need to know the highest reserved >> busnr for children bus. Because parent's >> bus->busn_res could have padding in it. >> This function return the max child busnr as >> pci_scan_child_bus(). >> >> Signed-off-by: Yijing Wang <wangyijing@huawei.com> >> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> >> Signed-off-by: Fengguang Wu <fengguang.wu@intel.com> > > I must have screwed this up. I don't know where the Signed-off-by from > Fengguang came from, but it shouldn't be there. And I also screwed up by > adding my own Signed-off-by to the branch while we're still iterating on > this series. The patches you post should not have my Signed-off-by in > them; I should add that. But that's my fault because put them in the > branch, and I asked you to pull that branch and modify and repost it. > -.-! I added the Fengguang Signed-off-by, because his kbuild test robot sent a patch to me to fix a building error. Sorry, will remove Fengguang and your Signed-off-by. >> --- >> drivers/pci/hotplug/acpiphp_glue.c | 29 +---------------------------- >> drivers/pci/pci.c | 27 +++++++++++++++++++++++++-- >> include/linux/pci.h | 2 +- >> 3 files changed, 27 insertions(+), 31 deletions(-) >> >> diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c >> index bcb90e4..84f2584 100644 >> --- a/drivers/pci/hotplug/acpiphp_glue.c >> +++ b/drivers/pci/hotplug/acpiphp_glue.c >> @@ -397,33 +397,6 @@ static void cleanup_bridge(struct acpiphp_bridge *bridge) >> acpi_unlock_hp_context(); >> } >> >> -/** >> - * acpiphp_max_busnr - return the highest reserved bus number under the given bus. >> - * @bus: bus to start search with >> - */ >> -static unsigned char acpiphp_max_busnr(struct pci_bus *bus) >> -{ >> - struct pci_bus *tmp; >> - unsigned char max, n; >> - >> - /* >> - * pci_bus_max_busnr will return the highest >> - * reserved busnr for all these children. >> - * that is equivalent to the bus->subordinate >> - * value. We don't want to use the parent's >> - * bus->subordinate value because it could have >> - * padding in it. >> - */ >> - max = bus->busn_res.start; >> - >> - list_for_each_entry(tmp, &bus->children, node) { >> - n = pci_bus_max_busnr(tmp); >> - if (n > max) >> - max = n; >> - } >> - return max; >> -} >> - >> static void acpiphp_set_acpi_region(struct acpiphp_slot *slot) >> { >> struct acpiphp_func *func; >> @@ -489,7 +462,7 @@ static void enable_slot(struct acpiphp_slot *slot) >> LIST_HEAD(add_list); >> >> acpiphp_rescan_slot(slot); >> - max = acpiphp_max_busnr(bus); >> + max = pci_bus_child_max_busnr(bus); >> for (pass = 0; pass < 2; pass++) { >> list_for_each_entry(dev, &bus->devices, bus_list) { >> if (PCI_SLOT(dev->devfn) != slot->device) >> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c >> index c49eec1..0001896 100644 >> --- a/drivers/pci/pci.c >> +++ b/drivers/pci/pci.c >> @@ -108,7 +108,7 @@ static bool pcie_ari_disabled; >> * Given a PCI bus, returns the highest PCI bus number present in the set >> * including the given PCI bus and its list of child PCI buses. >> */ >> -unsigned char pci_bus_max_busnr(struct pci_bus *bus) >> +static unsigned char pci_bus_max_busnr(struct pci_bus *bus) >> { >> struct pci_bus *tmp; >> unsigned char max, n; >> @@ -121,7 +121,30 @@ unsigned char pci_bus_max_busnr(struct pci_bus *bus) >> } >> return max; >> } >> -EXPORT_SYMBOL_GPL(pci_bus_max_busnr); >> + >> +unsigned char pci_bus_child_max_busnr(struct pci_bus *bus) >> +{ >> + struct pci_bus *tmp; >> + unsigned char max, n; >> + >> + /* >> + * pci_bus_max_busnr will return the highest >> + * reserved busnr for all these children. >> + * that is equivalent to the bus->subordinate >> + * value. We don't want to use the parent's >> + * bus->subordinate value because it could have >> + * padding in it. >> + */ >> + max = bus->busn_res.start; >> + >> + list_for_each_entry(tmp, &bus->children, node) { >> + n = pci_bus_max_busnr(tmp); >> + if (n > max) >> + max = n; >> + } >> + return max; >> +} >> +EXPORT_SYMBOL_GPL(pci_bus_child_max_busnr); >> >> #ifdef CONFIG_HAS_IOMEM >> void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar) >> diff --git a/include/linux/pci.h b/include/linux/pci.h >> index cfaf217..261b8de 100644 >> --- a/include/linux/pci.h >> +++ b/include/linux/pci.h >> @@ -1181,7 +1181,7 @@ int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, >> void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *), >> void *userdata); >> int pci_cfg_space_size(struct pci_dev *dev); >> -unsigned char pci_bus_max_busnr(struct pci_bus *bus); >> +unsigned char pci_bus_child_max_busnr(struct pci_bus *bus); >> void pci_setup_bridge(struct pci_bus *bus); >> resource_size_t pcibios_window_alignment(struct pci_bus *bus, >> unsigned long type); >> -- >> 1.7.1 >> > > . >
On Thu, Mar 12, 2015 at 09:28:30PM +0800, Yijing Wang wrote: > On 2015/3/12 11:36, Bjorn Helgaas wrote: > > On Mon, Mar 09, 2015 at 10:34:18AM +0800, Yijing Wang wrote: > >> Sometimes, we need to know the highest reserved > >> busnr for children bus. Because parent's > >> bus->busn_res could have padding in it. > >> This function return the max child busnr as > >> pci_scan_child_bus(). > >> > >> Signed-off-by: Yijing Wang <wangyijing@huawei.com> > >> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> > >> Signed-off-by: Fengguang Wu <fengguang.wu@intel.com> > > > > I must have screwed this up. I don't know where the Signed-off-by from > > Fengguang came from, but it shouldn't be there. And I also screwed up by > > adding my own Signed-off-by to the branch while we're still iterating on > > this series. The patches you post should not have my Signed-off-by in > > them; I should add that. But that's my fault because put them in the > > branch, and I asked you to pull that branch and modify and repost it. > > > > -.-! I added the Fengguang Signed-off-by, because his kbuild test robot sent a patch to me to fix a building error. Oh, OK. I forgot about that. I think it's OK to include Fengguang's Signed-off-by for that, but it should come before yours. Since you're the one sending the patch, your Signed-off-by should be last in the list.
diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c index bcb90e4..84f2584 100644 --- a/drivers/pci/hotplug/acpiphp_glue.c +++ b/drivers/pci/hotplug/acpiphp_glue.c @@ -397,33 +397,6 @@ static void cleanup_bridge(struct acpiphp_bridge *bridge) acpi_unlock_hp_context(); } -/** - * acpiphp_max_busnr - return the highest reserved bus number under the given bus. - * @bus: bus to start search with - */ -static unsigned char acpiphp_max_busnr(struct pci_bus *bus) -{ - struct pci_bus *tmp; - unsigned char max, n; - - /* - * pci_bus_max_busnr will return the highest - * reserved busnr for all these children. - * that is equivalent to the bus->subordinate - * value. We don't want to use the parent's - * bus->subordinate value because it could have - * padding in it. - */ - max = bus->busn_res.start; - - list_for_each_entry(tmp, &bus->children, node) { - n = pci_bus_max_busnr(tmp); - if (n > max) - max = n; - } - return max; -} - static void acpiphp_set_acpi_region(struct acpiphp_slot *slot) { struct acpiphp_func *func; @@ -489,7 +462,7 @@ static void enable_slot(struct acpiphp_slot *slot) LIST_HEAD(add_list); acpiphp_rescan_slot(slot); - max = acpiphp_max_busnr(bus); + max = pci_bus_child_max_busnr(bus); for (pass = 0; pass < 2; pass++) { list_for_each_entry(dev, &bus->devices, bus_list) { if (PCI_SLOT(dev->devfn) != slot->device) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index c49eec1..0001896 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -108,7 +108,7 @@ static bool pcie_ari_disabled; * Given a PCI bus, returns the highest PCI bus number present in the set * including the given PCI bus and its list of child PCI buses. */ -unsigned char pci_bus_max_busnr(struct pci_bus *bus) +static unsigned char pci_bus_max_busnr(struct pci_bus *bus) { struct pci_bus *tmp; unsigned char max, n; @@ -121,7 +121,30 @@ unsigned char pci_bus_max_busnr(struct pci_bus *bus) } return max; } -EXPORT_SYMBOL_GPL(pci_bus_max_busnr); + +unsigned char pci_bus_child_max_busnr(struct pci_bus *bus) +{ + struct pci_bus *tmp; + unsigned char max, n; + + /* + * pci_bus_max_busnr will return the highest + * reserved busnr for all these children. + * that is equivalent to the bus->subordinate + * value. We don't want to use the parent's + * bus->subordinate value because it could have + * padding in it. + */ + max = bus->busn_res.start; + + list_for_each_entry(tmp, &bus->children, node) { + n = pci_bus_max_busnr(tmp); + if (n > max) + max = n; + } + return max; +} +EXPORT_SYMBOL_GPL(pci_bus_child_max_busnr); #ifdef CONFIG_HAS_IOMEM void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar) diff --git a/include/linux/pci.h b/include/linux/pci.h index cfaf217..261b8de 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1181,7 +1181,7 @@ int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *), void *userdata); int pci_cfg_space_size(struct pci_dev *dev); -unsigned char pci_bus_max_busnr(struct pci_bus *bus); +unsigned char pci_bus_child_max_busnr(struct pci_bus *bus); void pci_setup_bridge(struct pci_bus *bus); resource_size_t pcibios_window_alignment(struct pci_bus *bus, unsigned long type);