drivers:hv: Make a function to free mmio regions through vmbus

This patch introduces a function that reverses everything
done by vmbus_allocate_mmio().  Existing code just called
release_mem_region().  Future patches in this series
require a more complex sequence of actions, so this function
is introduced to wrap those actions.

Signed-off-by: Jake Oshins <jakeo@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Orabug: 25507635
(cherry picked from commit 97fb77dc87582300fa3c141b63699f853576cab1)
Signed-off-by: Jack Vogel <jack.vogel@oracle.com>
Signed-off-by: Dhaval Giani <dhaval.giani@oracle.com>

diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 77ee76f6799c8675c852be8f4131715838419c33..f84fae0780e20c8dea7d8cfd872041f1a7d2797e 100644 (file)
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -1191,6 +1191,21 @@ int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
 }
 EXPORT_SYMBOL_GPL(vmbus_allocate_mmio);
 
+/**
+ * vmbus_free_mmio() - Free a memory-mapped I/O range.
+ * @start:             Base address of region to release.
+ * @size:              Size of the range to be allocated
+ *
+ * This function releases anything requested by
+ * vmbus_mmio_allocate().
+ */
+void vmbus_free_mmio(resource_size_t start, resource_size_t size)
+{
+       release_mem_region(start, size);
+
+}
+EXPORT_SYMBOL_GPL(vmbus_free_mmio);
+
 /**
  * vmbus_cpu_number_to_vp_number() - Map CPU to VP.
  * @cpu_number: CPU number in Linux terms

diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index e5cdef430880b3622e0924782d654f6bea6d245e..64cc296dd1ee7a834353a2c82a9bd9525f6a8180 100644 (file)
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -998,7 +998,7 @@ int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
                        resource_size_t min, resource_size_t max,
                        resource_size_t size, resource_size_t align,
                        bool fb_overlap_ok);
-
+void vmbus_free_mmio(resource_size_t start, resource_size_t size);
 int vmbus_cpu_number_to_vp_number(int cpu_number);
 
 /**