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async: remove unnecessary inc/dec pairs
Pull the increment/decrement pair out of aio_bh_poll and into the callers. Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Reviewed-by: Daniel P. Berrange <berrange@redhat.com> Message-id: 20170213135235.12274-18-pbonzini@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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parent
a153bf52b3
commit
bd451435c0
3 changed files with 13 additions and 15 deletions
12
util/async.c
12
util/async.c
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@ -90,15 +90,16 @@ void aio_bh_call(QEMUBH *bh)
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bh->cb(bh->opaque);
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}
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/* Multiple occurrences of aio_bh_poll cannot be called concurrently */
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/* Multiple occurrences of aio_bh_poll cannot be called concurrently.
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* The count in ctx->list_lock is incremented before the call, and is
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* not affected by the call.
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*/
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int aio_bh_poll(AioContext *ctx)
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{
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QEMUBH *bh, **bhp, *next;
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int ret;
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bool deleted = false;
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qemu_lockcnt_inc(&ctx->list_lock);
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ret = 0;
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for (bh = atomic_rcu_read(&ctx->first_bh); bh; bh = next) {
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next = atomic_rcu_read(&bh->next);
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@ -123,11 +124,10 @@ int aio_bh_poll(AioContext *ctx)
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/* remove deleted bhs */
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if (!deleted) {
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qemu_lockcnt_dec(&ctx->list_lock);
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return ret;
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}
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if (qemu_lockcnt_dec_and_lock(&ctx->list_lock)) {
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if (qemu_lockcnt_dec_if_lock(&ctx->list_lock)) {
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bhp = &ctx->first_bh;
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while (*bhp) {
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bh = *bhp;
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@ -138,7 +138,7 @@ int aio_bh_poll(AioContext *ctx)
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bhp = &bh->next;
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}
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}
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qemu_lockcnt_unlock(&ctx->list_lock);
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qemu_lockcnt_inc_and_unlock(&ctx->list_lock);
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}
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return ret;
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}
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