[PATCH 18/28] drm: avoid uninitialized timestamp use in wait_vblank

Arnd Bergmann
2016-10-17T22:16:21Z

gcc warns about the timestamp in drm_wait_vblank being possibly
used without an initialization:

drivers/gpu/drm/drm_irq.c: In function 'drm_crtc_send_vblank_event':
drivers/gpu/drm/drm_irq.c:992:24: error: 'now.tv_usec' may be used uninitialized in this function [-Werror=maybe-uninitialized]
drivers/gpu/drm/drm_irq.c:1069:17: note: 'now.tv_usec' was declared here
drivers/gpu/drm/drm_irq.c:991:23: error: 'now.tv_sec' may be used uninitialized in this function [-Werror=maybe-uninitialized]

This can happen if drm_vblank_count_and_time() returns 0 in its
error path. To sanitize the error case, I'm changing that function
to return a zero timestamp when it fails.

Fixes: e6ae8687a87b ("drm: idiot-proof vblank")
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Cc: Rob Clark <robdclark@gmail.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
First submitted in January 2016, second submission in February,
the patch is still required.

drivers/gpu/drm/drm_irq.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index b969a64..48a6167 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -952,8 +952,10 @@ static u32 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe,
u32 vblank_count;
unsigned int seq;

- if (WARN_ON(pipe >= dev->num_crtcs))
+ if (WARN_ON(pipe >= dev->num_crtcs)) {
+ *vblanktime = (struct timeval) { 0 };
return 0;
+ }

do {
seq = read_seqbegin(&vblank->seqlock);
--
2.9.0