xenfb: connect to backend before registering fb

As soon as the framebuffer is registered, our methods may be called by the
kernel. This leads to a crash as xenfb_refresh() gets called before we have
the irq.

Connect to the backend before registering our framebuffer with the kernel.

[ Fixes bug http://bugzilla.kernel.org/show_bug.cgi?id=14059 ]

Signed-off-by: Michal Schmidt <mschmidt@redhat.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/video/xen-fbfront.c b/drivers/video/xen-fbfront.c
index 15502d5e3641..54cd91610174 100644
--- a/drivers/video/xen-fbfront.c
+++ b/drivers/video/xen-fbfront.c
@@ -454,6 +454,10 @@ static int __devinit xenfb_probe(struct xenbus_device *dev,
 
         xenfb_init_shared_page(info, fb_info);
 
+        ret = xenfb_connect_backend(dev, info);
+        if (ret < 0)
+                goto error;
+
         ret = register_framebuffer(fb_info);
         if (ret) {
                 fb_deferred_io_cleanup(fb_info);
@@ -464,10 +468,6 @@ static int __devinit xenfb_probe(struct xenbus_device *dev,
         }
         info->fb_info = fb_info;
 
-        ret = xenfb_connect_backend(dev, info);
-        if (ret < 0)
-                goto error;
-
         xenfb_make_preferred_console();
         return 0;