iomap: implement pcim_iounmap_regions()

Implement pcim_iounmap_regions() - the opposite of
pcim_iomap_regions().

Signed-off-by: Tejun heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/lib/devres.c b/lib/devres.c
index eb38849aa717..b1d336ce7f3d 100644
--- a/lib/devres.c
+++ b/lib/devres.c
@@ -296,5 +296,31 @@ int pcim_iomap_regions(struct pci_dev *pdev, u16 mask, const char *name)
         return rc;
 }
 EXPORT_SYMBOL(pcim_iomap_regions);
+
+/**
+ * pcim_iounmap_regions - Unmap and release PCI BARs
+ * @pdev: PCI device to map IO resources for
+ * @mask: Mask of BARs to unmap and release
+ *
+ * Unamp and release regions specified by @mask.
+ */
+void pcim_iounmap_regions(struct pci_dev *pdev, u16 mask)
+{
+        void __iomem * const *iomap;
+        int i;
+
+        iomap = pcim_iomap_table(pdev);
+        if (!iomap)
+                return;
+
+        for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
+                if (!(mask & (1 << i)))
+                        continue;
+
+                pcim_iounmap(pdev, iomap[i]);
+                pci_release_region(pdev, i);
+        }
+}
+EXPORT_SYMBOL(pcim_iounmap_regions);
 #endif
 #endif