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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 <maarten.lankhorst@linux.intel.com>
Reported-and-tested-by: Joseph Yasi <joe.yasi@gmail.com>
Tested-by: Andreas Reis <andreas.reis@gmail.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: drm-intel-fixes@lists.freedesktop.org
Fixes: 3c28ff22f6 ("i915: wait for fence in prepare_plane_fb")
Link: http://patchwork.freedesktop.org/patch/msgid/5666EEC8.2000403@linux.intel.com
This commit is contained in:
Maarten Lankhorst 2015-12-08 15:52:56 +01:00
parent db1a6aa2af
commit bcf8be279c
1 changed files with 8 additions and 6 deletions
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14
drivers/gpu/drm/i915/intel_display.c
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@ -13902,13 +13902,15 @@ 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;
WARN_ON(ret < 0);
lret = reservation_object_wait_timeout_rcu(obj->base.dma_buf->resv,
false, true,
MAX_SCHEDULE_TIMEOUT);
if (lret == -ERESTARTSYS)
return lret;
WARN(lret < 0, "waiting returns %li\n", lret);
}
if (!obj) {