diff mbox series

[v2,3/6] coroutine/mutex: Store the coroutine in the CoWaitRecord only once

Message ID 20210309144015.557477-4-david.edmondson@oracle.com (mailing list archive)
State New, archived
Headers show
Series coroutine rwlock downgrade fix, minor VDI changes | expand

Commit Message

David Edmondson March 9, 2021, 2:40 p.m. UTC 
When taking the slow path for mutex acquisition, set the coroutine
value in the CoWaitRecord in push_waiter(), rather than both there and
in the caller.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: David Edmondson <david.edmondson@oracle.com>
---
 util/qemu-coroutine-lock.c | 1 -
 1 file changed, 1 deletion(-)
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Patch

diff --git a/util/qemu-coroutine-lock.c b/util/qemu-coroutine-lock.c
index 5816bf8900..eb73cf11dc 100644
--- a/util/qemu-coroutine-lock.c
+++ b/util/qemu-coroutine-lock.c
@@ -204,7 +204,6 @@  static void coroutine_fn qemu_co_mutex_lock_slowpath(AioContext *ctx,
     unsigned old_handoff;
 
     trace_qemu_co_mutex_lock_entry(mutex, self);
-    w.co = self;
     push_waiter(mutex, &w);
 
     /* This is the "Responsibility Hand-Off" protocol; a lock() picks from