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authorThierry Reding <treding@nvidia.com>2018-12-20 20:19:44 +0300
committerJassi Brar <jaswinder.singh@linaro.org>2018-12-22 01:49:25 +0300
commite898d9cdd3a9f105863d63dd3b46443742a4757c (patch)
tree48a3a80b84cc3a18b1589454d129c8b70cf18841 /drivers/mailbox/mailbox.c
parente2affdbef2aca880f4b9e758779c72540db5f168 (diff)
downloadlinux-e898d9cdd3a9f105863d63dd3b46443742a4757c.tar.xz
mailbox: Add device-managed registration functions
Add device-managed equivalents of the mbox_controller_register() and mbox_controller_unregister() functions that can be used to have the devres infrastructure automatically unregister mailbox controllers on driver probe failure or driver removal. This can help remove a lot of boiler plate code from drivers. Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Reviewed-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
Diffstat (limited to 'drivers/mailbox/mailbox.c')
-rw-r--r--drivers/mailbox/mailbox.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c
index 674b35f402f5..08ce9a1ab53a 100644
--- a/drivers/mailbox/mailbox.c
+++ b/drivers/mailbox/mailbox.c
@@ -515,3 +515,73 @@ void mbox_controller_unregister(struct mbox_controller *mbox)
mutex_unlock(&con_mutex);
}
EXPORT_SYMBOL_GPL(mbox_controller_unregister);
+
+static void __devm_mbox_controller_unregister(struct device *dev, void *res)
+{
+ struct mbox_controller **mbox = res;
+
+ mbox_controller_unregister(*mbox);
+}
+
+static int devm_mbox_controller_match(struct device *dev, void *res, void *data)
+{
+ struct mbox_controller **mbox = res;
+
+ if (WARN_ON(!mbox || !*mbox))
+ return 0;
+
+ return *mbox == data;
+}
+
+/**
+ * devm_mbox_controller_register() - managed mbox_controller_register()
+ * @dev: device owning the mailbox controller being registered
+ * @mbox: mailbox controller being registered
+ *
+ * This function adds a device-managed resource that will make sure that the
+ * mailbox controller, which is registered using mbox_controller_register()
+ * as part of this function, will be unregistered along with the rest of
+ * device-managed resources upon driver probe failure or driver removal.
+ *
+ * Returns 0 on success or a negative error code on failure.
+ */
+int devm_mbox_controller_register(struct device *dev,
+ struct mbox_controller *mbox)
+{
+ struct mbox_controller **ptr;
+ int err;
+
+ ptr = devres_alloc(__devm_mbox_controller_unregister, sizeof(*ptr),
+ GFP_KERNEL);
+ if (!ptr)
+ return -ENOMEM;
+
+ err = mbox_controller_register(mbox);
+ if (err < 0) {
+ devres_free(ptr);
+ return err;
+ }
+
+ devres_add(dev, ptr);
+ *ptr = mbox;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(devm_mbox_controller_register);
+
+/**
+ * devm_mbox_controller_unregister() - managed mbox_controller_unregister()
+ * @dev: device owning the mailbox controller being unregistered
+ * @mbox: mailbox controller being unregistered
+ *
+ * This function unregisters the mailbox controller and removes the device-
+ * managed resource that was set up to automatically unregister the mailbox
+ * controller on driver probe failure or driver removal. It's typically not
+ * necessary to call this function.
+ */
+void devm_mbox_controller_unregister(struct device *dev, struct mbox_controller *mbox)
+{
+ WARN_ON(devres_release(dev, __devm_mbox_controller_unregister,
+ devm_mbox_controller_match, mbox));
+}
+EXPORT_SYMBOL_GPL(devm_mbox_controller_unregister);