usb gadget: link fixes for gadget zero

Change how the Gadget Zero driver builds:  don't use
separate compilation, since it works poorly when key
parts are library code (with init sections etc).
Instead be as close as we can to "gcc --combine ...".

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 36 insertions, 17 deletions

diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
index 853dd0229431..55f589131e38 100644
--- a/drivers/usb/gadget/Makefile
+++ b/drivers/usb/gadget/Makefile
@@ -24,7 +24,7 @@ obj-$(CONFIG_USB_M66592)	+= m66592-udc.o
 #
 C_UTILS =       composite.o usbstring.o config.o epautoconf.o
 
-g_zero-objs                     := zero.o f_sourcesink.o f_loopback.o $(C_UTILS)
+g_zero-objs                     := zero.o
 g_ether-objs                    := ether.o u_ether.o f_subset.o f_ecm.o $(C_UTILS)
 g_serial-objs                   := serial.o
 g_midi-objs                     := gmidi.o usbstring.o config.o epautoconf.o
diff --git a/drivers/usb/gadget/f_loopback.c b/drivers/usb/gadget/f_loopback.c
index eda4cde72c82..87dde012dacc 100644
--- a/drivers/usb/gadget/f_loopback.c
+++ b/drivers/usb/gadget/f_loopback.c
@@ -70,7 +70,7 @@ static struct usb_interface_descriptor loopback_intf = {
 
 /* full speed support: */
 
-static struct usb_endpoint_descriptor fs_source_desc = {
+static struct usb_endpoint_descriptor fs_loop_source_desc = {
         .bLength =              USB_DT_ENDPOINT_SIZE,
         .bDescriptorType =      USB_DT_ENDPOINT,
 
@@ -78,7 +78,7 @@ static struct usb_endpoint_descriptor fs_source_desc = {
         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 };
 
-static struct usb_endpoint_descriptor fs_sink_desc = {
+static struct usb_endpoint_descriptor fs_loop_sink_desc = {
         .bLength =              USB_DT_ENDPOINT_SIZE,
         .bDescriptorType =      USB_DT_ENDPOINT,
 
@@ -88,14 +88,14 @@ static struct usb_endpoint_descriptor fs_sink_desc = {
 
 static struct usb_descriptor_header *fs_loopback_descs[] = {
         (struct usb_descriptor_header *) &loopback_intf,
-        (struct usb_descriptor_header *) &fs_sink_desc,
-        (struct usb_descriptor_header *) &fs_source_desc,
+        (struct usb_descriptor_header *) &fs_loop_sink_desc,
+        (struct usb_descriptor_header *) &fs_loop_source_desc,
         NULL,
 };
 
 /* high speed support: */
 
-static struct usb_endpoint_descriptor hs_source_desc = {
+static struct usb_endpoint_descriptor hs_loop_source_desc = {
         .bLength =              USB_DT_ENDPOINT_SIZE,
         .bDescriptorType =      USB_DT_ENDPOINT,
 
@@ -103,7 +103,7 @@ static struct usb_endpoint_descriptor hs_source_desc = {
         .wMaxPacketSize =       __constant_cpu_to_le16(512),
 };
 
-static struct usb_endpoint_descriptor hs_sink_desc = {
+static struct usb_endpoint_descriptor hs_loop_sink_desc = {
         .bLength =              USB_DT_ENDPOINT_SIZE,
         .bDescriptorType =      USB_DT_ENDPOINT,
 
@@ -113,8 +113,8 @@ static struct usb_endpoint_descriptor hs_sink_desc = {
 
 static struct usb_descriptor_header *hs_loopback_descs[] = {
         (struct usb_descriptor_header *) &loopback_intf,
-        (struct usb_descriptor_header *) &hs_source_desc,
-        (struct usb_descriptor_header *) &hs_sink_desc,
+        (struct usb_descriptor_header *) &hs_loop_source_desc,
+        (struct usb_descriptor_header *) &hs_loop_sink_desc,
         NULL,
 };
 
@@ -152,7 +152,7 @@ loopback_bind(struct usb_configuration *c, struct usb_function *f)
 
         /* allocate endpoints */
 
-        loop->in_ep = usb_ep_autoconfig(cdev->gadget, &fs_source_desc);
+        loop->in_ep = usb_ep_autoconfig(cdev->gadget, &fs_loop_source_desc);
         if (!loop->in_ep) {
 autoconf_fail:
                 ERROR(cdev, "%s: can't autoconfigure on %s\n",
@@ -161,17 +161,17 @@ autoconf_fail:
         }
         loop->in_ep->driver_data = cdev;        /* claim */
 
-        loop->out_ep = usb_ep_autoconfig(cdev->gadget, &fs_sink_desc);
+        loop->out_ep = usb_ep_autoconfig(cdev->gadget, &fs_loop_sink_desc);
         if (!loop->out_ep)
                 goto autoconf_fail;
         loop->out_ep->driver_data = cdev;       /* claim */
 
         /* support high speed hardware */
         if (gadget_is_dualspeed(c->cdev->gadget)) {
-                hs_source_desc.bEndpointAddress =
-                                fs_source_desc.bEndpointAddress;
-                hs_sink_desc.bEndpointAddress =
-                                fs_sink_desc.bEndpointAddress;
+                hs_loop_source_desc.bEndpointAddress =
+                                fs_loop_source_desc.bEndpointAddress;
+                hs_loop_sink_desc.bEndpointAddress =
+                                fs_loop_sink_desc.bEndpointAddress;
                 f->hs_descriptors = hs_loopback_descs;
         }
 
@@ -255,8 +255,10 @@ enable_loopback(struct usb_composite_dev *cdev, struct f_loopback *loop)
         struct usb_request                      *req;
         unsigned                                i;
 
-        src = ep_choose(cdev->gadget, &hs_source_desc, &fs_source_desc);
-        sink = ep_choose(cdev->gadget, &hs_sink_desc, &fs_sink_desc);
+        src = ep_choose(cdev->gadget,
+                        &hs_loop_source_desc, &fs_loop_source_desc);
+        sink = ep_choose(cdev->gadget,
+                        &hs_loop_sink_desc, &fs_loop_sink_desc);
 
         /* one endpoint writes data back IN to the host */
         ep = loop->in_ep;
diff --git a/drivers/usb/gadget/zero.c b/drivers/usb/gadget/zero.c
index aa0bd4f126a1..361d9659ac48 100644
--- a/drivers/usb/gadget/zero.c
+++ b/drivers/usb/gadget/zero.c
@@ -59,6 +59,23 @@
 
 /*-------------------------------------------------------------------------*/
 
+/*
+ * Kbuild is not very cooperative with respect to linking separately
+ * compiled library objects into one module.  So for now we won't use
+ * separate compilation ... ensuring init/exit sections work to shrink
+ * the runtime footprint, and giving us at least some parts of what
+ * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
+ */
+#include "composite.c"
+#include "usbstring.c"
+#include "config.c"
+#include "epautoconf.c"
+
+#include "f_sourcesink.c"
+#include "f_loopback.c"
+
+/*-------------------------------------------------------------------------*/
+
 #define DRIVER_VERSION          "Cinco de Mayo 2008"
 
 static const char longname[] = "Gadget Zero";