From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 41C89187A for ; Wed, 28 Dec 2022 16:01:03 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8F70BC433EF; Wed, 28 Dec 2022 16:01:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1672243262; bh=Ct+mYGhl3hN88rg24PYTXGECb/qTwT8CyWyh/9w1Ojg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=X+1oHC2BjCznzJHqATCcd7TsHgoGXibeYY9gbkyMh9uQe8Yfxmpu9d4UWUL56ZQHO 7mnpa7dRT/vACdsT8sK85fVQ8mdD+AAMTH2LCJeFYfbsaaAfmCuCXMlqOG3nNJXyp9 KXI2frNbi0buOK/4ZFxx3I8HdlPiJ5pWfAzSo3h8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yang Jihong , Jens Axboe , Sasha Levin Subject: [PATCH 6.0 0507/1073] blktrace: Fix output non-blktrace event when blk_classic option enabled Date: Wed, 28 Dec 2022 15:34:55 +0100 Message-Id: <20221228144341.819410129@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20221228144328.162723588@linuxfoundation.org> References: <20221228144328.162723588@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Yang Jihong [ Upstream commit f596da3efaf4130ff61cd029558845808df9bf99 ] When the blk_classic option is enabled, non-blktrace events must be filtered out. Otherwise, events of other types are output in the blktrace classic format, which is unexpected. The problem can be triggered in the following ways: # echo 1 > /sys/kernel/debug/tracing/options/blk_classic # echo 1 > /sys/kernel/debug/tracing/events/enable # echo blk > /sys/kernel/debug/tracing/current_tracer # cat /sys/kernel/debug/tracing/trace_pipe Fixes: c71a89615411 ("blktrace: add ftrace plugin") Signed-off-by: Yang Jihong Link: https://lore.kernel.org/r/20221122040410.85113-1-yangjihong1@huawei.com Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- kernel/trace/blktrace.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index 7f5eb295fe19..ee22a3b1c181 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -1546,7 +1546,8 @@ blk_trace_event_print_binary(struct trace_iterator *iter, int flags, static enum print_line_t blk_tracer_print_line(struct trace_iterator *iter) { - if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) + if ((iter->ent->type != TRACE_BLK) || + !(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC)) return TRACE_TYPE_UNHANDLED; return print_one_line(iter, true); -- 2.35.1