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dma-buf/sync_file: Increment refcount of fence when all are signaled.

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When we merge several fences, if all of them are signaled already, we
still keep one of them. So instead of using add_fence(), which will not
increase the refcount of signaled fences, we should explicitly call
fence_get() for the fence we are keeping.

This patch fixes a kernel panic that can be triggered by creating a fence
that is expired (or increasing the timeline until it expires), then
creating a merged fence out of it, and deleting the merged fence. This
will make the original expired fence's refcount go to zero.

Testcase: igt/sw_sync/sync_expired_merge
Signed-off-by: Rafael Antognolli <rafael.antognolli@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Link: http://patchwork.freedesktop.org/patch/msgid/1473966865-4508-1-git-send-email-rafael.antognolli@intel.com
This commit is contained in:
Rafael Antognolli 2016-09-15 12:14:25 -07:00 committed by Sumit Semwal
parent 699fbeeac4
commit 7cec540a72
1 changed files with 2 additions and 4 deletions
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6
drivers/dma-buf/sync_file.c
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@ -253,10 +253,8 @@ static struct sync_file *sync_file_merge(const char *name, struct sync_file *a,
for (; i_b < b_num_fences; i_b++)
add_fence(fences, &i, b_fences[i_b]);
if (i == 0) {
add_fence(fences, &i, a_fences[0]);
i++;
}
if (i == 0)
fences[i++] = fence_get(a_fences[0]);
if (num_fences > i) {
nfences = krealloc(fences, i * sizeof(*fences),