drm/i915: check the return value from the copy from user
This produced a warning on my build, not sure why super-warning-man didn't
notice this one, its much worse than the %z one.
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index e5d2bdf..e0389ad 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -446,13 +446,16 @@
int length)
{
char __iomem *vaddr;
+ unsigned long unwritten;
vaddr = kmap_atomic(pages[page_base >> PAGE_SHIFT], KM_USER0);
if (vaddr == NULL)
return -ENOMEM;
- __copy_from_user_inatomic(vaddr + page_offset, data, length);
+ unwritten = __copy_from_user_inatomic(vaddr + page_offset, data, length);
kunmap_atomic(vaddr, KM_USER0);
+ if (unwritten)
+ return -EFAULT;
return 0;
}