1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/char/drm/i810_dma.c b/drivers/char/drm/i810_dma.c
index 28ee6e3f1d9..fa2de70f740 100644
--- a/drivers/char/drm/i810_dma.c
+++ b/drivers/char/drm/i810_dma.c
@@ -141,10 +141,10 @@ static int i810_map_buffer(drm_buf_t * buf, struct file *filp)
                                             MAP_SHARED, buf->bus_address);
         dev_priv->mmap_buffer = NULL;
         filp->f_op = old_fops;
-        if ((unsigned long)buf_priv->virtual > -1024UL) {
+        if (IS_ERR(buf_priv->virtual)) {
                 /* Real error */
                 DRM_ERROR("mmap error\n");
-                retcode = (signed int)buf_priv->virtual;
+                retcode = PTR_ERR(buf_priv->virtual);
                 buf_priv->virtual = NULL;
         }
         up_write(&current->mm->mmap_sem);
@@ -808,7 +808,7 @@ static void i810_dma_dispatch_vertex(drm_device_t * dev,
                     ((GFX_OP_PRIMITIVE | prim | ((used / 4) - 2)));
 
                 if (used & 4) {
-                        *(u32 *) ((u32) buf_priv->kernel_virtual + used) = 0;
+                        *(u32 *) ((char *) buf_priv->kernel_virtual + used) = 0;
                         used += 4;
                 }
 
@@ -1166,7 +1166,7 @@ static void i810_dma_dispatch_mc(drm_device_t * dev, drm_buf_t * buf, int used,
 
         if (buf_priv->currently_mapped == I810_BUF_MAPPED) {
                 if (used & 4) {
-                        *(u32 *) ((u32) buf_priv->virtual + used) = 0;
+                        *(u32 *) ((char *) buf_priv->virtual + used) = 0;
                         used += 4;
                 }