From de0513365cff619335a59417dea1d1ca665c2cfd Mon Sep 17 00:00:00 2001 From: Maarten Lankhorst Date: Tue, 8 Dec 2015 15:52:56 +0100 Subject: [PATCH] drm/i915: Widen return value for reservation_object_wait_timeout_rcu to long. This fixes a spurious warning from an integer overflow on 64-bits systems. The function may return MAX_SCHEDULE_TIMEOUT which gets truncated to -1. Explicitly handling this by casting to lret fixes it. Signed-off-by: Maarten Lankhorst Reported-and-tested-by: Joseph Yasi Tested-by: Andreas Reis Reviewed-by: Daniel Vetter Cc: drm-intel-fixes@lists.freedesktop.org Fixes: 3c28ff22f6e20c ("i915: wait for fence in prepare_plane_fb") Link: http://patchwork.freedesktop.org/patch/msgid/5666EEC8.2000403@linux.intel.com (cherry picked from commit bcf8be279c79df6a8a17d9c3e1f9bc926444a87c) Signed-off-by: Jani Nikula --- drivers/gpu/drm/i915/intel_display.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 11af6f52b3e4..e5b0e932fbaa 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -13765,13 +13765,15 @@ intel_prepare_plane_fb(struct drm_plane *plane, /* For framebuffer backed by dmabuf, wait for fence */ if (obj && obj->base.dma_buf) { - ret = reservation_object_wait_timeout_rcu(obj->base.dma_buf->resv, - false, true, - MAX_SCHEDULE_TIMEOUT); - if (ret == -ERESTARTSYS) - return ret; + long lret; + + lret = reservation_object_wait_timeout_rcu(obj->base.dma_buf->resv, + false, true, + MAX_SCHEDULE_TIMEOUT); + if (lret == -ERESTARTSYS) + return lret; - WARN_ON(ret < 0); + WARN(lret < 0, "waiting returns %li\n", lret); } if (!obj) { -- 2.11.0