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authorThierry Reding <treding@nvidia.com>2015-09-25 17:29:04 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-10-05 05:02:40 +0100
commitdbe2256ddd8e8420c254c79f4045c41cb5f4bd6b (patch)
treee90776bacb2349a6828b4e079aa131ff5293a61d /drivers/base
parent7568fb63f57ac8672f8bf2018171255441238882 (diff)
driver-core: platform: Provide helpers for multi-driver modules
Some modules register several sub-drivers. Provide a helper that makes it easy to register and unregister a list of sub-drivers, as well as unwind properly on error. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/platform.c61
1 files changed, 61 insertions, 0 deletions
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 07cec9ba5e70..1dd6d3bf1098 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -710,6 +710,67 @@ err_out:
}
EXPORT_SYMBOL_GPL(__platform_create_bundle);
+/**
+ * __platform_register_drivers - register an array of platform drivers
+ * @drivers: an array of drivers to register
+ * @count: the number of drivers to register
+ * @owner: module owning the drivers
+ *
+ * Registers platform drivers specified by an array. On failure to register a
+ * driver, all previously registered drivers will be unregistered. Callers of
+ * this API should use platform_unregister_drivers() to unregister drivers in
+ * the reverse order.
+ *
+ * Returns: 0 on success or a negative error code on failure.
+ */
+int __platform_register_drivers(struct platform_driver * const *drivers,
+ unsigned int count, struct module *owner)
+{
+ unsigned int i;
+ int err;
+
+ for (i = 0; i < count; i++) {
+ pr_debug("registering platform driver %ps\n", drivers[i]);
+
+ err = __platform_driver_register(drivers[i], owner);
+ if (err < 0) {
+ pr_err("failed to register platform driver %ps: %d\n",
+ drivers[i], err);
+ goto error;
+ }
+ }
+
+ return 0;
+
+error:
+ while (i--) {
+ pr_debug("unregistering platform driver %ps\n", drivers[i]);
+ platform_driver_unregister(drivers[i]);
+ }
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(__platform_register_drivers);
+
+/**
+ * platform_unregister_drivers - unregister an array of platform drivers
+ * @drivers: an array of drivers to unregister
+ * @count: the number of drivers to unregister
+ *
+ * Unegisters platform drivers specified by an array. This is typically used
+ * to complement an earlier call to platform_register_drivers(). Drivers are
+ * unregistered in the reverse order in which they were registered.
+ */
+void platform_unregister_drivers(struct platform_driver * const *drivers,
+ unsigned int count)
+{
+ while (count--) {
+ pr_debug("unregistering platform driver %ps\n", drivers[count]);
+ platform_driver_unregister(drivers[count]);
+ }
+}
+EXPORT_SYMBOL_GPL(platform_unregister_drivers);
+
/* modalias support enables more hands-off userspace setup:
* (a) environment variable lets new-style hotplug events work once system is
* fully running: "modprobe $MODALIAS"