From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CA51FC76196 for ; Mon, 15 Jul 2019 15:10:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A0F7B2054F for ; Mon, 15 Jul 2019 15:10:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563203401; bh=/UwpRocLzH4/r8wShvwIlTO2lUR/CX5Blry8W7vYgz0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=VsUCuagWZ8kQoFdm9ncM4ng+/E3ab3Tkrh9NSP/PcsTSjz7//6YeVPcR7/k6HBOLs n6o/lWFAZ+499fYqOhfPMWxpmDhfQgY0scDyvB1hgXIQopB7zmiWRfz5wU6TkeNXaf V7KwN1XH6Jr4oQWQCm48SLdk/d8y4n+yMDzwNfrM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731435AbfGON4A (ORCPT ); Mon, 15 Jul 2019 09:56:00 -0400 Received: from mail.kernel.org ([198.145.29.99]:60326 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732757AbfGONz5 (ORCPT ); Mon, 15 Jul 2019 09:55:57 -0400 Received: from sasha-vm.mshome.net (unknown [73.61.17.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4500F212F5; Mon, 15 Jul 2019 13:55:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563198956; bh=/UwpRocLzH4/r8wShvwIlTO2lUR/CX5Blry8W7vYgz0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Imq/BlmLzvGkxnC05JeyHHwpwkoVJyKKdo97GdG0QYW+jHb5kDEj85GBIeSt6cPec dwbssl8PMTdseTyhDjyqepIisoqBc+W8wFZDP062qMwpL0EKaSf4TskqhcXQXV/BO3 6X4+ULsT7r8AAzhiCWicQZ8Am4ioCLqhh+XNvdfE= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Marco Felsch , Lucas Stach , Philipp Zabel , Hans Verkuil , Mauro Carvalho Chehab , Sasha Levin , linux-media@vger.kernel.org Subject: [PATCH AUTOSEL 5.2 152/249] media: coda: fix last buffer handling in V4L2_ENC_CMD_STOP Date: Mon, 15 Jul 2019 09:45:17 -0400 Message-Id: <20190715134655.4076-152-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190715134655.4076-1-sashal@kernel.org> References: <20190715134655.4076-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Marco Felsch [ Upstream commit f3775f89852d167990b0d718587774cf00d22ac2 ] coda_encoder_cmd() is racy, as the last scheduled picture run worker can still be in-flight while the ENC_CMD_STOP command is issued. Depending on the exact timing the sequence numbers might already be changed, but the last buffer might not have been put on the destination queue yet. In this case the current implementation would prematurely wake the destination queue with last_buffer_dequeued=true, causing userspace to call streamoff before the last buffer is handled. Close this race window by synchronizing with the pic_run_worker before doing the sequence check. Signed-off-by: Marco Felsch [l.stach@pengutronix.de: switch to flush_work, reword commit message] Signed-off-by: Lucas Stach Signed-off-by: Philipp Zabel Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/media/platform/coda/coda-common.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/media/platform/coda/coda-common.c b/drivers/media/platform/coda/coda-common.c index 6238047273f2..68a585d3af91 100644 --- a/drivers/media/platform/coda/coda-common.c +++ b/drivers/media/platform/coda/coda-common.c @@ -1024,6 +1024,8 @@ static int coda_encoder_cmd(struct file *file, void *fh, /* Set the stream-end flag on this context */ ctx->bit_stream_param |= CODA_BIT_STREAM_END_FLAG; + flush_work(&ctx->pic_run_work); + /* If there is no buffer in flight, wake up */ if (!ctx->streamon_out || ctx->qsequence == ctx->osequence) { dst_vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, -- 2.20.1