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PCI: Make pci_bus_for_each_resource() index optional

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Refactor pci_bus_for_each_resource() in the same way as
pci_dev_for_each_resource(). This allows the index to be hidden inside the
implementation so the caller can omit it when it's not used otherwise.

No functional changes intended.

Link: https://lore.kernel.org/r/20230330162434.35055-6-andriy.shevchenko@linux.intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Krzysztof Wilczyński <kw@linux.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
This commit is contained in:
Andy Shevchenko
2023-04-04 10:45:25 -05:00
committed by Bjorn Helgaas
parent ceb928be5c
commit 02992064bd
6 changed files with 32 additions and 22 deletions
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24
include/linux/pci.h
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@@ -1444,11 +1444,21 @@ int devm_request_pci_bus_resources(struct device *dev,
/* Temporary until new and working PCI SBR API in place */
int pci_bridge_secondary_bus_reset(struct pci_dev *dev);
#define __pci_bus_for_each_res0(bus, res, ...) \
for (unsigned int __b = 0; \
(res = pci_bus_resource_n(bus, __b)) || __b < PCI_BRIDGE_RESOURCE_NUM; \
__b++)
#define __pci_bus_for_each_res1(bus, res, __b) \
for (__b = 0; \
(res = pci_bus_resource_n(bus, __b)) || __b < PCI_BRIDGE_RESOURCE_NUM; \
__b++)
/**
* pci_bus_for_each_resource - iterate over PCI bus resources
* @bus: the PCI bus
* @res: pointer to the current resource
* @i: index of the current resource
* @...: optional index of the current resource
*
* Iterate over PCI bus resources. The first part is to go over PCI bus
* resource array, which has at most the %PCI_BRIDGE_RESOURCE_NUM entries.
@@ -1461,13 +1471,17 @@ int pci_bridge_secondary_bus_reset(struct pci_dev *dev);
* struct resource *res;
* unsigned int i;
*
* // With optional index
* pci_bus_for_each_resource(bus, res, i)
* pr_info("PCI bus resource[%u]: %pR\n", i, res);
*
* // Without index
* pci_bus_for_each_resource(bus, res)
* _do_something_(res);
*/
#define pci_bus_for_each_resource(bus, res, i) \
for (i = 0; \
(res = pci_bus_resource_n(bus, i)) || i < PCI_BRIDGE_RESOURCE_NUM; \
i++)
#define pci_bus_for_each_resource(bus, res, ...) \
CONCATENATE(__pci_bus_for_each_res, COUNT_ARGS(__VA_ARGS__)) \
(bus, res, __VA_ARGS__)
int __must_check pci_bus_alloc_resource(struct pci_bus *bus,
struct resource *res, resource_size_t size,