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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1748459375; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=HStRn09SDnQ2rx+ji7nQGXhi2TqDjYgUUMWPO9PJpK4=; b=Ii/nfNyzc4omtSGuY4vV+y4a8lc5YOLm6eOWDR2RjzwOU1bKE+BZQbJFv9buR8US6Hsr1w cvfKg6s+xyiMxB/wQ9c6ElWEk96WvLPV672id/nh4e5ZzHddlj4QbRM9G5652KK4Mo6WK6 vy+O/vqtwDNfGB1aXOJD6gi8tPqyeiI= X-MC-Unique: aIRGlIAwMOuhqKxvI9EqcA-1 X-Mimecast-MFC-AGG-ID: aIRGlIAwMOuhqKxvI9EqcA_1748459371 From: Stefan Hajnoczi To: qemu-devel@nongnu.org Cc: qemu-block@nongnu.org, Stefan Hajnoczi , hibriansong@gmail.com, Kevin Wolf , Hanna Czenczek Subject: [RFC 06/11] aio: free AioContext when aio_context_new() fails Date: Wed, 28 May 2025 15:09:11 -0400 Message-ID: <20250528190916.35864-7-stefanha@redhat.com> In-Reply-To: <20250528190916.35864-1-stefanha@redhat.com> References: <20250528190916.35864-1-stefanha@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" g_source_destroy() only removes the GSource from the GMainContext it's attached to, if any. It does not free it. Use g_source_unref() instead so that the AioContext (which embeds a GSource) is freed. There is no need to call g_source_destroy() in aio_context_new() because the GSource isn't attached to a GMainContext yet. aio_ctx_finalize() expects everything to be set up already, so introduce the new ctx->initialized boolean and do nothing when called with !initialized. This also requires moving aio_context_setup() down after event_notifier_init() since aio_ctx_finalize() won't release any resources that aio_context_setup() acquired. Signed-off-by: Stefan Hajnoczi Reviewed-by: Eric Blake --- include/block/aio.h | 3 +++ util/async.c | 12 ++++++++++-- 2 files changed, 13 insertions(+), 2 deletions(-) diff --git a/include/block/aio.h b/include/block/aio.h index 1657740a0e..2760f308f5 100644 --- a/include/block/aio.h +++ b/include/block/aio.h @@ -291,6 +291,9 @@ struct AioContext { gpointer epollfd_tag; =20 const FDMonOps *fdmon_ops; + + /* Was aio_context_new() successful? */ + bool initialized; }; =20 /** diff --git a/util/async.c b/util/async.c index a39410d675..bc841eeb4f 100644 --- a/util/async.c +++ b/util/async.c @@ -369,6 +369,10 @@ aio_ctx_finalize(GSource *source) QEMUBH *bh; unsigned flags; =20 + if (!ctx->initialized) { + return; + } + thread_pool_free_aio(ctx->thread_pool); =20 #ifdef CONFIG_LINUX_AIO @@ -579,13 +583,15 @@ AioContext *aio_context_new(Error **errp) ctx =3D (AioContext *) g_source_new(&aio_source_funcs, sizeof(AioConte= xt)); QSLIST_INIT(&ctx->bh_list); QSIMPLEQ_INIT(&ctx->bh_slice_list); - aio_context_setup(ctx); =20 ret =3D event_notifier_init(&ctx->notifier, false); if (ret < 0) { error_setg_errno(errp, -ret, "Failed to initialize event notifier"= ); goto fail; } + + aio_context_setup(ctx); + g_source_set_can_recurse(&ctx->source, true); qemu_lockcnt_init(&ctx->list_lock); =20 @@ -619,9 +625,11 @@ AioContext *aio_context_new(Error **errp) =20 register_aiocontext(ctx); =20 + ctx->initialized =3D true; + return ctx; fail: - g_source_destroy(&ctx->source); + g_source_unref(&ctx->source); return NULL; } =20 --=20 2.49.0