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[88.112.131.206]) by smtp.gmail.com with ESMTPSA id u9-20020a2e1409000000b002554b7b9a16sm4872619ljd.73.2022.07.04.02.44.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 04 Jul 2022 02:44:41 -0700 (PDT) From: Vladimir Zapolskiy To: Robert Foss , Todor Tomov Cc: Bjorn Andersson , Andy Gross , Mauro Carvalho Chehab , Hans Verkuil , linux-media@vger.kernel.org, linux-arm-msm@vger.kernel.org Subject: [PATCH] media: camss: Clean up received buffers on failed start of streaming Date: Mon, 4 Jul 2022 12:44:37 +0300 Message-Id: <20220704094437.468395-1-vladimir.zapolskiy@linaro.org> X-Mailer: git-send-email 2.33.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org It is required to return the received buffers, if streaming can not be started. For instance media_pipeline_start() may fail with EPIPE, if a link validation between entities is not passed, and in such a case a user gets a kernel warning: WARNING: CPU: 1 PID: 520 at drivers/media/common/videobuf2/videobuf2-core.c:1592 vb2_start_streaming+0xec/0x160 Call trace: vb2_start_streaming+0xec/0x160 vb2_core_streamon+0x9c/0x1a0 vb2_ioctl_streamon+0x68/0xbc v4l_streamon+0x30/0x3c __video_do_ioctl+0x184/0x3e0 video_usercopy+0x37c/0x7b0 video_ioctl2+0x24/0x40 v4l2_ioctl+0x4c/0x70 The fix is to correct the error path in video_start_streaming() of camss. Fixes: 0ac2586c410f ("media: camss: Add files which handle the video device nodes") Signed-off-by: Vladimir Zapolskiy Reviewed-by: Robert Foss --- drivers/media/platform/qcom/camss/camss-video.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/media/platform/qcom/camss/camss-video.c b/drivers/media/platform/qcom/camss/camss-video.c index b5f12ec5c50c..d272ffa02112 100644 --- a/drivers/media/platform/qcom/camss/camss-video.c +++ b/drivers/media/platform/qcom/camss/camss-video.c @@ -495,7 +495,7 @@ static int video_start_streaming(struct vb2_queue *q, unsigned int count) ret = media_pipeline_start(&vdev->entity, &video->pipe); if (ret < 0) - return ret; + goto flush_buffers; ret = video_check_format(video); if (ret < 0) @@ -524,6 +524,7 @@ static int video_start_streaming(struct vb2_queue *q, unsigned int count) error: media_pipeline_stop(&vdev->entity); +flush_buffers: video->ops->flush_buffers(video, VB2_BUF_STATE_QUEUED); return ret;