From patchwork Tue Mar 14 14:21:22 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Minghsiu Tsai X-Patchwork-Id: 9623519 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 6196E60492 for ; Tue, 14 Mar 2017 14:23:25 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 524E3285A3 for ; Tue, 14 Mar 2017 14:23:25 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 47060285B3; Tue, 14 Mar 2017 14:23:25 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CDB8A285A3 for ; Tue, 14 Mar 2017 14:23:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751523AbdCNOXI (ORCPT ); Tue, 14 Mar 2017 10:23:08 -0400 Received: from mailgw02.mediatek.com ([210.61.82.184]:45903 "EHLO mailgw02.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1752673AbdCNOVi (ORCPT ); Tue, 14 Mar 2017 10:21:38 -0400 Received: from mtkhts07.mediatek.inc [(172.21.101.69)] by mailgw02.mediatek.com (envelope-from ) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 175498700; Tue, 14 Mar 2017 22:21:28 +0800 Received: from mtkslt302.mediatek.inc (10.21.14.115) by mtkhts07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 14.3.266.1; Tue, 14 Mar 2017 22:21:26 +0800 From: Minghsiu Tsai To: Hans Verkuil , , Rob Herring , Mauro Carvalho Chehab , Matthias Brugger , Daniel Kurtz , Pawel Osciak CC: , Eddie Huang , Yingjoe Chen , Wu-Cheng Li , , , , , , Bin Liu , Rick Chang , Minghsiu Tsai Subject: [PATCH] media: mtk-jpeg: fix continuous log "Context is NULL" Date: Tue, 14 Mar 2017 22:21:22 +0800 Message-ID: <1489501282-52137-1-git-send-email-minghsiu.tsai@mediatek.com> X-Mailer: git-send-email 1.9.1 MIME-Version: 1.0 X-MTK: N Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The symptom is continuous log "mtk-jpeg 18004000.jpegdec: Context is NULL" in kernel log. It is becauese the error handling in irq doesn't clear interrupt. The calling flow like as below when issue happen mtk_jpeg_device_run() mtk_jpeg_job_abort() v4l2_m2m_job_finish() -> m2m_dev->curr_ctx = NULL; mtk_jpeg_dec_irq() v4l2_m2m_get_curr_priv() -> m2m_dev->curr_ctx == NULL -> return NULL log "Context is NULL" There is race condition between job_abort() and irq. In order to simplify code, don't want to add extra flag to maintain state, empty job_abort() and clear interrupt before v4l2_m2m_get_curr_priv() in irq. Signed-off-by: Minghsiu Tsai Reviewed-by: Wu-Cheng Li Tested-by: Wu-Cheng Li Acked-by: Rick Chang --- drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c | 14 ++------------ 1 file changed, 2 insertions(+), 12 deletions(-) diff --git a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c index b10183f..c02bc7f 100644 --- a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c +++ b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c @@ -862,15 +862,6 @@ static int mtk_jpeg_job_ready(void *priv) static void mtk_jpeg_job_abort(void *priv) { - struct mtk_jpeg_ctx *ctx = priv; - struct mtk_jpeg_dev *jpeg = ctx->jpeg; - struct vb2_buffer *src_buf, *dst_buf; - - src_buf = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx); - dst_buf = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx); - v4l2_m2m_buf_done(to_vb2_v4l2_buffer(src_buf), VB2_BUF_STATE_ERROR); - v4l2_m2m_buf_done(to_vb2_v4l2_buffer(dst_buf), VB2_BUF_STATE_ERROR); - v4l2_m2m_job_finish(jpeg->m2m_dev, ctx->fh.m2m_ctx); } static struct v4l2_m2m_ops mtk_jpeg_m2m_ops = { @@ -941,6 +932,8 @@ static irqreturn_t mtk_jpeg_dec_irq(int irq, void *priv) u32 dec_ret; int i; + dec_ret = mtk_jpeg_dec_get_int_status(jpeg->dec_reg_base); + dec_irq_ret = mtk_jpeg_dec_enum_result(dec_ret); ctx = v4l2_m2m_get_curr_priv(jpeg->m2m_dev); if (!ctx) { v4l2_err(&jpeg->v4l2_dev, "Context is NULL\n"); @@ -951,9 +944,6 @@ static irqreturn_t mtk_jpeg_dec_irq(int irq, void *priv) dst_buf = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx); jpeg_src_buf = mtk_jpeg_vb2_to_srcbuf(src_buf); - dec_ret = mtk_jpeg_dec_get_int_status(jpeg->dec_reg_base); - dec_irq_ret = mtk_jpeg_dec_enum_result(dec_ret); - if (dec_irq_ret >= MTK_JPEG_DEC_RESULT_UNDERFLOW) mtk_jpeg_dec_reset(jpeg->dec_reg_base);