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dma-buf: Report signaled links inside dma-fence-chain

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Whenever we walk along the dma-fence-chain, we prune signaled links to
keep the chain nice and tidy. This leads to situations where we can
prune a link and report the earlier fence as the target seqno --
violating our own consistency checks that the seqno is not more advanced
than the last element in a dma-fence-chain.

Report a NULL fence and success if the seqno has already been signaled.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Tested-by: Venkata Sandeep Dhanalakota <venkata.s.dhanalakota@intel.com>
Reviewed-by: Venkata Sandeep Dhanalakota <venkata.s.dhanalakota@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200409110101.18400-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2020-04-09 12:01:00 +01:00
parent 29da47cfc1
commit 5de376bb43
1 changed files with 7 additions and 0 deletions
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7
drivers/dma-buf/dma-fence-chain.c
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@ -99,6 +99,12 @@ int dma_fence_chain_find_seqno(struct dma_fence **pfence, uint64_t seqno)
return -EINVAL;
dma_fence_chain_for_each(*pfence, &chain->base) {
if ((*pfence)->seqno < seqno) { /* already signaled */
dma_fence_put(*pfence);
*pfence = NULL;
break;
}
if ((*pfence)->context != chain->base.context ||
to_dma_fence_chain(*pfence)->prev_seqno < seqno)
break;
@ -222,6 +228,7 @@ EXPORT_SYMBOL(dma_fence_chain_ops);
* @chain: the chain node to initialize
* @prev: the previous fence
* @fence: the current fence
* @seqno: the sequence number (syncpt) of the fence within the chain
*
* Initialize a new chain node and either start a new chain or add the node to
* the existing chain of the previous fence.