On 8/24/2021 8:42 AM, Matthew Brost wrote:
On Fri, Aug 20, 2021 at 05:07:27PM -0700, Daniele Ceraolo Spurio wrote:
On 8/18/2021 11:16 PM, Matthew Brost wrote:
A context can get destroyed after cancelling a request so take a
reference to context when cancelling a request.
What's the exact race? AFAICS __i915_request_skip does not have a
context_put().
This commit message isn't quite right, it is really a context reset or a
GT reset which could result in the context getting destroyed. I haven't
actually seen this happen but this just being paranoid about ref
counting. Can fix up the commit message.
ok, with an updated commit message:
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
Daniele
Matt
Daniele
Fixes: 62eaf0ae217d ("drm/i915/guc: Support request cancellation")
Signed-off-by: Matthew Brost <matthew.brost@xxxxxxxxx>
---
drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index e0e85e4ad512..85f96d325048 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -1620,8 +1620,10 @@ static void guc_context_cancel_request(struct intel_context *ce,
struct i915_request *rq)
{
if (i915_sw_fence_signaled(&rq->submit)) {
- struct i915_sw_fence *fence = guc_context_block(ce);
+ struct i915_sw_fence *fence;
+ intel_context_get(ce);
+ fence = guc_context_block(ce);
i915_sw_fence_wait(fence);
if (!i915_request_completed(rq)) {
__i915_request_skip(rq);
@@ -1636,6 +1638,7 @@ static void guc_context_cancel_request(struct intel_context *ce,
flush_work(&ce_to_guc(ce)->ct.requests.worker);
guc_context_unblock(ce);
+ intel_context_put(ce);
}
}
