lib: logic_pio: Add logic_pio_unregister_range()

BugLink: https://bugs.launchpad.net/bugs/1843338
commit b884e2de2afc68ce30f7093747378ef972dde253 upstream.

Add a function to unregister a logical PIO range.

Logical PIO space can still be leaked when unregistering certain
LOGIC_PIO_CPU_MMIO regions, but this acceptable for now since there are no
callers to unregister LOGIC_PIO_CPU_MMIO regions, and the logical PIO
region allocation scheme would need significant work to improve this.

Cc: stable@vger.kernel.org
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/include/linux/logic_pio.h b/include/linux/logic_pio.h
index cbd9d8495690212fc689d3ce3a7caf0812d45523..88e1e6304a7193bca45a14500f7ade4632dbd335 100644 (file)
--- a/include/linux/logic_pio.h
+++ b/include/linux/logic_pio.h
@@ -117,6 +117,7 @@ struct logic_pio_hwaddr *find_io_range_by_fwnode(struct fwnode_handle *fwnode);
 unsigned long logic_pio_trans_hwaddr(struct fwnode_handle *fwnode,
                        resource_size_t hw_addr, resource_size_t size);
 int logic_pio_register_range(struct logic_pio_hwaddr *newrange);
+void logic_pio_unregister_range(struct logic_pio_hwaddr *range);
 resource_size_t logic_pio_to_hwaddr(unsigned long pio);
 unsigned long logic_pio_trans_cpuaddr(resource_size_t hw_addr);
 

diff --git a/lib/logic_pio.c b/lib/logic_pio.c
index d0165c88f705b193937606d174201ae3ec2722b7..905027574e5d8041d1394dc4e5582061ed084e2f 100644 (file)
--- a/lib/logic_pio.c
+++ b/lib/logic_pio.c
@@ -98,6 +98,20 @@ end_register:
        return ret;
 }
 
+/**
+ * logic_pio_unregister_range - unregister a logical PIO range for a host
+ * @range: pointer to the IO range which has been already registered.
+ *
+ * Unregister a previously-registered IO range node.
+ */
+void logic_pio_unregister_range(struct logic_pio_hwaddr *range)
+{
+       mutex_lock(&io_range_mutex);
+       list_del_rcu(&range->list);
+       mutex_unlock(&io_range_mutex);
+       synchronize_rcu();
+}
+
 /**
  * find_io_range_by_fwnode - find logical PIO range for given FW node
  * @fwnode: FW node handle associated with logical PIO range