[PATCH v8 09/25] PCI/sysfs: Add stubs for pci_{create,remove}_sysfs_dev_files()

["Krzysztof Wilczyński" <kwilczynski@kernel.org>]

On platforms with HAVE_PCI_MMAP or ARCH_GENERIC_PCI_MMAP_RESOURCE,
resource files are now handled by static attribute groups registered
via pci_dev_groups[].

Thus, the pci_create_sysfs_dev_files() and pci_remove_sysfs_dev_files()
can now be stubbed out, as the dynamic resource file creation is no
longer needed.

Also, simplify pci_sysfs_init() on these platforms to only iterate
buses for legacy attributes creation, skipping the per-device loop.

Move the __weak stubs for pci_create_resource_files() and
pci_remove_resource_files() into the #else branch since only platforms
without HAVE_PCI_MMAP (such as Alpha architecture) still need them.
Guard the res_attr[] and res_attr_wc[] fields in struct pci_dev the
same way.

Tested-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
---
 drivers/pci/pci-sysfs.c | 15 ++++++++++++---
 include/linux/pci.h     |  4 ++++
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index b8b7fb809c69..208ec7057b50 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -1370,10 +1370,9 @@ static const struct attribute_group *pci_dev_resource_attr_groups[] = {
 };
 #else
 #define pci_dev_resource_attr_groups NULL
-#endif
-
 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
 void __weak pci_remove_resource_files(struct pci_dev *dev) { }
+#endif
 
 /**
  * pci_write_rom - used to enable access to the PCI ROM display
@@ -1742,6 +1741,10 @@ static const struct attribute_group pci_dev_resource_resize_attr_group = {
 	.is_visible = resource_resize_attr_is_visible,
 };
 
+#if defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)
+int pci_create_sysfs_dev_files(struct pci_dev *pdev) { return 0; }
+void pci_remove_sysfs_dev_files(struct pci_dev *pdev) { }
+#else
 int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
 {
 	if (!sysfs_initialized)
@@ -1763,9 +1766,15 @@ void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
 
 	pci_remove_resource_files(pdev);
 }
+#endif
 
 static int __init pci_sysfs_init(void)
 {
+#if defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)
+	struct pci_bus *pbus = NULL;
+
+	sysfs_initialized = 1;
+#else
 	struct pci_dev *pdev = NULL;
 	struct pci_bus *pbus = NULL;
 	int retval;
@@ -1778,7 +1787,7 @@ static int __init pci_sysfs_init(void)
 			return retval;
 		}
 	}
-
+#endif
 	while ((pbus = pci_find_next_bus(pbus)))
 		pci_create_legacy_files(pbus);
 
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 974605c9fce2..b998a56f6010 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -515,8 +515,10 @@ struct pci_dev {
 	spinlock_t	pcie_cap_lock;		/* Protects RMW ops in capability accessors */
 	u32		saved_config_space[16]; /* Config space saved at suspend time */
 	struct hlist_head saved_cap_space;
+#if !defined(HAVE_PCI_MMAP) && !defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)
 	struct bin_attribute *res_attr[DEVICE_COUNT_RESOURCE]; /* sysfs file for resources */
 	struct bin_attribute *res_attr_wc[DEVICE_COUNT_RESOURCE]; /* sysfs file for WC mapping of resources */
+#endif
 
 #ifdef CONFIG_HOTPLUG_PCI_PCIE
 	unsigned int	broken_cmd_compl:1;	/* No compl for some cmds */
@@ -2531,8 +2533,10 @@ int pcibios_alloc_irq(struct pci_dev *dev);
 void pcibios_free_irq(struct pci_dev *dev);
 resource_size_t pcibios_default_alignment(void);
 
+#if !defined(HAVE_PCI_MMAP) && !defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)
 extern int pci_create_resource_files(struct pci_dev *dev);
 extern void pci_remove_resource_files(struct pci_dev *dev);
+#endif
 
 #if defined(CONFIG_PCI_MMCONFIG) || defined(CONFIG_ACPI_MCFG)
 void __init pci_mmcfg_early_init(void);
-- 
2.54.0