[v2,2/3] PCI/sysfs: Pass iomem_get_mapping() as a function pointer

Commit Message

Krzysztof Wilczyński June 26, 2021, 12:57 p.m. UTC

The struct bin_attribute requires the "mapping" member to be a function
pointer with a signature requiring the return type to be a pointer to
the struct address_space.

Thus, convert every invocation of iomem_get_mapping() into a function
pointer assignment, therefore allowing for the iomem_get_mapping()
invocation to be deferred to when the sysfs open callback runs.

Suggested-by: Dan Williams <[e-mail]>
Signed-off-by: Krzysztof Wilczyński <[e-mail]>
Reviewed-by: Dan Williams <[e-mail]>
---
 drivers/pci/pci-sysfs.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Patch

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index beb8d1f4fafe..cff1c121eb08 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -965,7 +965,7 @@  void pci_create_legacy_files(struct pci_bus *b)
 	b->legacy_io->read = pci_read_legacy_io;
 	b->legacy_io->write = pci_write_legacy_io;
 	b->legacy_io->mmap = pci_mmap_legacy_io;
-	b->legacy_io->mapping = iomem_get_mapping();
+	b->legacy_io->mapping = iomem_get_mapping;
 	pci_adjust_legacy_attr(b, pci_mmap_io);
 	error = device_create_bin_file(&b->dev, b->legacy_io);
 	if (error)
@@ -978,7 +978,7 @@  void pci_create_legacy_files(struct pci_bus *b)
 	b->legacy_mem->size = 1024*1024;
 	b->legacy_mem->attr.mode = 0600;
 	b->legacy_mem->mmap = pci_mmap_legacy_mem;
-	b->legacy_io->mapping = iomem_get_mapping();
+	b->legacy_io->mapping = iomem_get_mapping;
 	pci_adjust_legacy_attr(b, pci_mmap_mem);
 	error = device_create_bin_file(&b->dev, b->legacy_mem);
 	if (error)
@@ -1195,7 +1195,7 @@  static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
 		}
 	}
 	if (res_attr->mmap)
-		res_attr->mapping = iomem_get_mapping();
+		res_attr->mapping = iomem_get_mapping;
 	res_attr->attr.name = res_attr_name;
 	res_attr->attr.mode = 0600;
 	res_attr->size = pci_resource_len(pdev, num);