2 files changed, 37 insertions, 12 deletions

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 4fa954b07ac4..9d2ee25deaf5 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -1000,7 +1000,7 @@ static __initdata LIST_HEAD(early_platform_device_list);
 int __init early_platform_driver_register(struct early_platform_driver *epdrv,
                                           char *buf)
 {
-        unsigned long index;
+        char *tmp;
         int n;
 
         /* Simply add the driver to the end of the global list.
@@ -1019,13 +1019,28 @@ int __init early_platform_driver_register(struct early_platform_driver *epdrv,
         if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
                 list_move(&epdrv->list, &early_platform_driver_list);
 
-                if (!strcmp(buf, epdrv->pdrv->driver.name))
+                /* Allow passing parameters after device name */
+                if (buf[n] == '\0' || buf[n] == ',')
                         epdrv->requested_id = -1;
-                else if (buf[n] == '.' && strict_strtoul(&buf[n + 1], 10,
-                                                         &index) == 0)
-                        epdrv->requested_id = index;
-                else
-                        epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
+                else {
+                        epdrv->requested_id = simple_strtoul(&buf[n + 1],
+                                                             &tmp, 10);
+
+                        if (buf[n] != '.' || (tmp == &buf[n + 1])) {
+                                epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
+                                n = 0;
+                        } else
+                                n += strcspn(&buf[n + 1], ",") + 1;
+                }
+
+                if (buf[n] == ',')
+                        n++;
+
+                if (epdrv->bufsize) {
+                        memcpy(epdrv->buffer, &buf[n],
+                               min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1));
+                        epdrv->buffer[epdrv->bufsize - 1] = '\0';
+                }
         }
 
         return 0;
diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
index 3c6675c2444b..71ff887ca44e 100644
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -83,6 +83,8 @@ struct early_platform_driver {
         struct platform_driver *pdrv;
         struct list_head list;
         int requested_id;
+        char *buffer;
+        int bufsize;
 };
 
 #define EARLY_PLATFORM_ID_UNSET -2
@@ -102,21 +104,29 @@ extern int early_platform_driver_probe(char *class_str,
                                        int nr_probe, int user_only);
 extern void early_platform_cleanup(void);
 
+#define early_platform_init(class_string, platdrv)              \
+        early_platform_init_buffer(class_string, platdrv, NULL, 0)
 
 #ifndef MODULE
-#define early_platform_init(class_string, platform_driver)              \
+#define early_platform_init_buffer(class_string, platdrv, buf, bufsiz)  \
 static __initdata struct early_platform_driver early_driver = {         \
         .class_str = class_string,                                      \
-        .pdrv = platform_driver,                                        \
+        .buffer = buf,                                                  \
+        .bufsize = bufsiz,                                              \
+        .pdrv = platdrv,                                                \
         .requested_id = EARLY_PLATFORM_ID_UNSET,                        \
 };                                                                      \
-static int __init early_platform_driver_setup_func(char *buf)           \
+static int __init early_platform_driver_setup_func(char *buffer)        \
 {                                                                       \
-        return early_platform_driver_register(&early_driver, buf);      \
+        return early_platform_driver_register(&early_driver, buffer);   \
 }                                                                       \
 early_param(class_string, early_platform_driver_setup_func)
 #else /* MODULE */
-#define early_platform_init(class_string, platform_driver)
+#define early_platform_init_buffer(class_string, platdrv, buf, bufsiz)  \
+static inline char *early_platform_driver_setup_func(void)              \
+{                                                                       \
+        return bufsiz ? buf : NULL;                                     \
+}
 #endif /* MODULE */
 
 #endif /* _PLATFORM_DEVICE_H_ */