[PATCH] drm: Initialize or valgrind-clear modesetting ioctl arguments.

[Eric Anholt]

Fixes valgrind complaints in the modesetting driver.  I tried to
follow each ioctl's pattern for whether it was initializing just the
in values, or both in and out values.
---
 Makefile.am   |  2 ++
 xf86drmMode.c | 19 +++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/Makefile.am b/Makefile.am
index f726036..826c30d 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -59,6 +59,8 @@ libdrm_la_LDFLAGS = -version-number 2:4:0 -no-undefined
 libdrm_la_LIBADD = @CLOCK_LIB@

 libdrm_la_CPPFLAGS = -I$(top_srcdir)/include/drm
+AM_CFLAGS = \
+       $(VALGRIND_CFLAGS)

 libdrm_la_SOURCES =                            \
        xf86drm.c                               \
diff --git a/xf86drmMode.c b/xf86drmMode.c
index 6b60c35..dd7966e 100644
--- a/xf86drmMode.c
+++ b/xf86drmMode.c
@@ -41,6 +41,10 @@
 #include <sys/ioctl.h>
 #include <stdio.h>

+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include "xf86drmMode.h"
 #include "xf86drm.h"
 #include <drm.h>
@@ -49,6 +53,16 @@
 #include <unistd.h>
 #include <errno.h>

+#ifdef HAVE_VALGRIND
+#include <valgrind.h>
+#include <memcheck.h>
+#define VG(x) x
+#else
+#define VG(x)
+#endif
+
+#define VG_CLEAR(s) VG(memset(&s, 0, sizeof(s)))
+
 #define U642VOID(x) ((void *)(unsigned long)(x))
 #define VOID2U64(x) ((uint64_t)(unsigned long)(x))

@@ -245,6 +259,7 @@ int drmModeAddFB(int fd, uint32_t width, uint32_t height, 
uint8_t depth,
        struct drm_mode_fb_cmd f;
        int ret;

+       VG_CLEAR(f);
        f.width  = width;
        f.height = height;
        f.pitch  = pitch;
@@ -335,6 +350,7 @@ drmModeCrtcPtr drmModeGetCrtc(int fd, uint32_t crtcId)
        struct drm_mode_crtc crtc;
        drmModeCrtcPtr r;

+       VG_CLEAR(crtc);
        crtc.crtc_id = crtcId;

        if (drmIoctl(fd, DRM_IOCTL_MODE_GETCRTC, &crtc))
@@ -368,6 +384,7 @@ int drmModeSetCrtc(int fd, uint32_t crtcId, uint32_t 
bufferId,
 {
        struct drm_mode_crtc crtc;

+       VG_CLEAR(crtc);
        crtc.x             = x;
        crtc.y             = y;
        crtc.crtc_id       = crtcId;
@@ -436,6 +453,7 @@ drmModeEncoderPtr drmModeGetEncoder(int fd, uint32_t 
encoder_id)
        drmModeEncoderPtr r = NULL;

        enc.encoder_id = encoder_id;
+       enc.crtc_id = 0;
        enc.encoder_type = 0;
        enc.possible_crtcs = 0;
        enc.possible_clones = 0;
@@ -580,6 +598,7 @@ drmModePropertyPtr drmModeGetProperty(int fd, uint32_t 
property_id)
        struct drm_mode_get_property prop;
        drmModePropertyPtr r;

+       VG_CLEAR(prop);
        prop.prop_id = property_id;
        prop.count_enum_blobs = 0;
        prop.count_values = 0;
-- 
1.8.5.1