1 files changed, 18 insertions, 0 deletions

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 17b5ece8f82c..eb84d9d44645 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -160,6 +160,11 @@ static void platform_device_release(struct device *dev)
  *
  *      Create a platform device object which can have other objects attached
  *      to it, and which will have attached objects freed when it is released.
+ *
+ *      This device will be marked as not supporting hotpluggable drivers; no
+ *      device add/remove uevents will be generated.  In the unusual case that
+ *      the device isn't being dynamically allocated as a legacy "probe the
+ *      hardware" driver, infrastructure code should reverse this marking.
  */
 struct platform_device *platform_device_alloc(const char *name, unsigned int id)
 {
@@ -172,6 +177,12 @@ struct platform_device *platform_device_alloc(const char *name, unsigned int id)
                 pa->pdev.id = id;
                 device_initialize(&pa->pdev.dev);
                 pa->pdev.dev.release = platform_device_release;
+
+                /* prevent hotplug "modprobe $(MODALIAS)" from causing trouble in
+                 * legacy probe-the-hardware drivers, which don't properly split
+                 * out device enumeration logic from drivers.
+                 */
+                pa->pdev.dev.uevent_suppress = 1;
         }
 
         return pa ? &pa->pdev : NULL;
@@ -351,6 +362,13 @@ EXPORT_SYMBOL_GPL(platform_device_unregister);
  *      memory allocated for the device allows drivers using such devices
  *      to be unloaded iwithout waiting for the last reference to the device
  *      to be dropped.
+ *
+ *      This interface is primarily intended for use with legacy drivers
+ *      which probe hardware directly.  Because such drivers create sysfs
+ *      device nodes themselves, rather than letting system infrastructure
+ *      handle such device enumeration tasks, they don't fully conform to
+ *      the Linux driver model.  In particular, when such drivers are built
+ *      as modules, they can't be "hotplugged".
  */
 struct platform_device *platform_device_register_simple(char *name, unsigned int id,
                                                         struct resource *res, unsigned int num)