ACPI video: Don't start video device until its associated input device has been allocated

Quoth Dmitry Torokhov:
In addition to bus notifier we do install device notifier explicitly
so it might fire up early. The easiest fox would be to move
acpi_video_bus_start_devices() after input_allocate_device() but
before input_register_device() - unregistered input devices can handle
input_event() calls just fine.

May fix crashes reported in:
https://bugzilla.kernel.org/show_bug.cgi?id=40672

Signed-off-by: Igor Murzov <e-mail@date.by>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 8 insertions, 7 deletions

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 462486b9f9b2..9577b6fa2650 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -1658,16 +1658,17 @@ static int acpi_video_bus_add(struct acpi_device *device)
         error = acpi_video_bus_get_devices(video, device);
         if (error)
                 goto err_free_video;
-        error = acpi_video_bus_start_devices(video);
-        if (error)
-                goto err_put_video;
 
         video->input = input = input_allocate_device();
         if (!input) {
                 error = -ENOMEM;
-                goto err_stop_video;
+                goto err_put_video;
         }
 
+        error = acpi_video_bus_start_devices(video);
+        if (error)
+                goto err_free_input_dev;
+
         snprintf(video->phys, sizeof(video->phys),
                 "%s/video/input0", acpi_device_hid(video->device));
 
@@ -1688,7 +1689,7 @@ static int acpi_video_bus_add(struct acpi_device *device)
 
         error = input_register_device(input);
         if (error)
-                goto err_free_input_dev;
+                goto err_stop_video;
 
         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
@@ -1706,10 +1707,10 @@ static int acpi_video_bus_add(struct acpi_device *device)
 
  err_unregister_input_dev:
         input_unregister_device(input);
- err_free_input_dev:
-        input_free_device(input);
  err_stop_video:
         acpi_video_bus_stop_devices(video);
+ err_free_input_dev:
+        input_free_device(input);
  err_put_video:
         acpi_video_bus_put_devices(video);
         kfree(video->attached_array);