drm: fix crash with fops lock and fixup sarea/page size locking

[mirror_ubuntu-artful-kernel.git] / drivers / char / drm / drm_fops.c

diff --git a/drivers/char/drm/drm_fops.c b/drivers/char/drm/drm_fops.c
index 898f47dafec0b2fc6234e0c7f42ad3a4656e70ef..afe5f07f2e171e6001af950414d31df703080b07 100644 (file)
--- a/drivers/char/drm/drm_fops.c
+++ b/drivers/char/drm/drm_fops.c
@@ -46,6 +46,7 @@ static int drm_setup(drm_device_t * dev)
        drm_local_map_t *map;
        int i;
        int ret;
+       u32 sareapage;
 
        if (dev->driver->firstopen) {
                ret = dev->driver->firstopen(dev);
@@ -56,7 +57,8 @@ static int drm_setup(drm_device_t * dev)
        dev->magicfree.next = NULL;
 
        /* prebuild the SAREA */
-       i = drm_addmap(dev, 0, SAREA_MAX, _DRM_SHM, _DRM_CONTAINS_LOCK, &map);
+       sareapage = max(SAREA_MAX, PAGE_SIZE);
+       i = drm_addmap(dev, 0, sareapage, _DRM_SHM, _DRM_CONTAINS_LOCK, &map);
        if (i != 0)
                return i;
 
@@ -84,7 +86,7 @@ static int drm_setup(drm_device_t * dev)
        INIT_LIST_HEAD(&dev->ctxlist->head);
 
        dev->vmalist = NULL;
-       dev->sigdata.lock = dev->lock.hw_lock = NULL;
+       dev->sigdata.lock = NULL;
        init_waitqueue_head(&dev->lock.lock_queue);
        dev->queue_count = 0;
        dev->queue_reserved = 0;