aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/phy/mdio_bus.c
diff options
context:
space:
mode:
authorGrygorii Strashko <grygorii.strashko@ti.com>2014-04-30 15:23:33 +0300
committerDavid S. Miller <davem@davemloft.net>2014-05-02 16:16:26 -0400
commit6d48f44b7b2af67b33c1ae5994b8f642685c8bc8 (patch)
tree3c39a984abea3ca8016660b111783874d982f5b4 /drivers/net/phy/mdio_bus.c
parentca8b6e04bc38891cbc0f2c7855bc7d0498dfff9b (diff)
downloadlinux-linaro-stable-6d48f44b7b2af67b33c1ae5994b8f642685c8bc8.tar.gz
mdio_bus: implement devm_mdiobus_alloc/devm_mdiobus_free
Add a resource managed devm_mdiobus_alloc[_size]()/devm_mdiobus_free() to automatically clean up MDIO bus alocations made by MDIO drivers, thus leading to simplified MDIO drivers code. Cc: Florian Fainelli <f.fainelli@gmail.com> Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Acked-and-tested-by: Lad, Prabhakar <prabhakar.csengg@gmail.com> Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/phy/mdio_bus.c')
-rw-r--r--drivers/net/phy/mdio_bus.c67
1 files changed, 67 insertions, 0 deletions
diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 76f54b32a120..68a9a3867c0f 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -69,6 +69,73 @@ struct mii_bus *mdiobus_alloc_size(size_t size)
}
EXPORT_SYMBOL(mdiobus_alloc_size);
+static void _devm_mdiobus_free(struct device *dev, void *res)
+{
+ mdiobus_free(*(struct mii_bus **)res);
+}
+
+static int devm_mdiobus_match(struct device *dev, void *res, void *data)
+{
+ struct mii_bus **r = res;
+
+ if (WARN_ON(!r || !*r))
+ return 0;
+
+ return *r == data;
+}
+
+/**
+ * devm_mdiobus_alloc_size - Resource-managed mdiobus_alloc_size()
+ * @dev: Device to allocate mii_bus for
+ * @sizeof_priv: Space to allocate for private structure.
+ *
+ * Managed mdiobus_alloc_size. mii_bus allocated with this function is
+ * automatically freed on driver detach.
+ *
+ * If an mii_bus allocated with this function needs to be freed separately,
+ * devm_mdiobus_free() must be used.
+ *
+ * RETURNS:
+ * Pointer to allocated mii_bus on success, NULL on failure.
+ */
+struct mii_bus *devm_mdiobus_alloc_size(struct device *dev, int sizeof_priv)
+{
+ struct mii_bus **ptr, *bus;
+
+ ptr = devres_alloc(_devm_mdiobus_free, sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return NULL;
+
+ /* use raw alloc_dr for kmalloc caller tracing */
+ bus = mdiobus_alloc_size(sizeof_priv);
+ if (bus) {
+ *ptr = bus;
+ devres_add(dev, ptr);
+ } else {
+ devres_free(ptr);
+ }
+
+ return bus;
+}
+EXPORT_SYMBOL_GPL(devm_mdiobus_alloc);
+
+/**
+ * devm_mdiobus_free - Resource-managed mdiobus_free()
+ * @dev: Device this mii_bus belongs to
+ * @bus: the mii_bus associated with the device
+ *
+ * Free mii_bus allocated with devm_mdiobus_alloc_size().
+ */
+void devm_mdiobus_free(struct device *dev, struct mii_bus *bus)
+{
+ int rc;
+
+ rc = devres_release(dev, _devm_mdiobus_free,
+ devm_mdiobus_match, bus);
+ WARN_ON(rc);
+}
+EXPORT_SYMBOL_GPL(devm_mdiobus_free);
+
/**
* mdiobus_release - mii_bus device release callback
* @d: the target struct device that contains the mii_bus