Index: graphics/libdrm/Makefile
===================================================================
--- graphics/libdrm/Makefile	(revision 400649)
+++ graphics/libdrm/Makefile	(working copy)
@@ -3,6 +3,7 @@
 
 PORTNAME=	libdrm
 PORTVERSION=	2.4.65
+PORTREVISION=	1
 PORTEPOCH=	1
 CATEGORIES=	graphics x11
 MASTER_SITES=	http://dri.freedesktop.org/libdrm/
@@ -59,6 +60,12 @@
 PLIST_SUB+=	RADEON_DRIVERS="@comment "
 .endif
 
+# This variable is not for users. So use a non-default name, intended for
+# people working on DRM kernel module development.
+.if !defined(LIBDRM_SKIP_RETURN_PATCH)
+EXTRA_PATCHES+=	${FILESDIR}/extra-xf86drm.c
+.endif
+
 pre-patch:
 	@${REINPLACE_CMD} 's|{libdir}/pkgconfig|{prefix}/libdata/pkgconfig|g; \
 			   s,i?86|x86_64),i?86|amd64|x86_64),g' \
Index: graphics/libdrm/files/extra-xf86drm.c
===================================================================
--- graphics/libdrm/files/extra-xf86drm.c	(nonexistent)
+++ graphics/libdrm/files/extra-xf86drm.c	(working copy)
@@ -0,0 +1,15 @@
+Error code 512 is being leaked from kernel space. While it should be
+converted to either EINTR or EAGAIN in the kernel. Teach libdrm to do this
+for now. Newer kernel modules will have this fixed included.
+
+--- xf86drm.c.orig	2015-11-02 12:26:19.910518000 +0100
++++ xf86drm.c	2015-11-02 12:27:10.575894000 +0100
+@@ -174,7 +174,7 @@
+ 
+     do {
+ 	ret = ioctl(fd, request, arg);
+-    } while (ret == -1 && (errno == EINTR || errno == EAGAIN));
++    } while (ret == -1 && (errno == EINTR || errno == EAGAIN || errno == 512));
+     return ret;
+ }
+ 

Property changes on: graphics/libdrm/files/extra-xf86drm.c
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