[v4,1/7] PCI: Deprecate pcim_iounmap_regions()

Commit Message

Philipp Stanner Aug. 27, 2024, 6:56 p.m. UTC

The function pcim_iounmap_regions() is problematic because it uses a
bitmask mechanism to release / iounmap multiple BARs at once. It, thus,
prevents getting rid of the problematic iomap table mechanism which was
deprecated in commit e354bb84a4c1 ("PCI: Deprecate pcim_iomap_table(),
pcim_iomap_regions_request_all()").

Make pcim_iounmap_region() public as the successor of
pcim_iounmap_regions().

Mark pcim_iounmap_regions() as deprecated.

Signed-off-by: Philipp Stanner <[e-mail]>
---
 drivers/pci/devres.c | 8 ++++++--
 include/linux/pci.h  | 1 +
 2 files changed, 7 insertions(+), 2 deletions(-)

Patch

diff --git a/drivers/pci/devres.c b/drivers/pci/devres.c
index b97589e99fad..5f6f889249b0 100644
--- a/drivers/pci/devres.c
+++ b/drivers/pci/devres.c
@@ -771,7 +771,7 @@  EXPORT_SYMBOL(pcim_iomap_region);
  * Unmap a BAR and release its region manually. Only pass BARs that were
  * previously mapped by pcim_iomap_region().
  */
-static void pcim_iounmap_region(struct pci_dev *pdev, int bar)
+void pcim_iounmap_region(struct pci_dev *pdev, int bar)
 {
 	struct pcim_addr_devres res_searched;
 
@@ -782,6 +782,7 @@  static void pcim_iounmap_region(struct pci_dev *pdev, int bar)
 	devres_release(&pdev->dev, pcim_addr_resource_release,
 			pcim_addr_resources_match, &res_searched);
 }
+EXPORT_SYMBOL(pcim_iounmap_region);
 
 /**
  * pcim_iomap_regions - Request and iomap PCI BARs (DEPRECATED)
@@ -1013,11 +1014,14 @@  int pcim_iomap_regions_request_all(struct pci_dev *pdev, int mask,
 EXPORT_SYMBOL(pcim_iomap_regions_request_all);
 
 /**
- * pcim_iounmap_regions - Unmap and release PCI BARs
+ * pcim_iounmap_regions - Unmap and release PCI BARs (DEPRECATED)
  * @pdev: PCI device to map IO resources for
  * @mask: Mask of BARs to unmap and release
  *
  * Unmap and release regions specified by @mask.
+ *
+ * This function is DEPRECATED. Do not use it in new code.
+ * Use pcim_iounmap_region() instead.
  */
 void pcim_iounmap_regions(struct pci_dev *pdev, int mask)
 {
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 01b9f1a351be..9625d8a7b655 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -2297,6 +2297,7 @@  void __iomem * const *pcim_iomap_table(struct pci_dev *pdev);
 int pcim_request_region(struct pci_dev *pdev, int bar, const char *name);
 void __iomem *pcim_iomap_region(struct pci_dev *pdev, int bar,
 				       const char *name);
+void pcim_iounmap_region(struct pci_dev *pdev, int bar);
 int pcim_iomap_regions(struct pci_dev *pdev, int mask, const char *name);
 int pcim_iomap_regions_request_all(struct pci_dev *pdev, int mask,
 				   const char *name);