From patchwork Thu Jan 27 02:55:42 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yunfei Dong X-Patchwork-Id: 12726192 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 9BC87C433F5 for ; Thu, 27 Jan 2022 02:58:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=qdcNH42lPf0c34IWIpZjOmBzlw+fXvRo18/9Q8nsFaw=; b=UWhp8O+JVe8TSF WHiu9vxvIC0ooIYbmXDLrevZPnc1ARJsHYgTvDoTkrx+M2iDpikqEUNYY9kZz6xYRTHQYvGtSfmpl eCjhgLgK0hthSaJDT7Eh/z2xkhvURxBw9oaTdEX3LgzQR34mK5wPhypA99G/nts/8P8ap75Irtktx r0OxLp/KntcfcHylJnafEtNcT09QglzxHLlJEBx3DyYj099TGvMid+j1oiWpXwPLuwHO4I+nBthwW EOsrIEyUJSVsTm8wrSx/eF/AQZhfu9V1zUyyL25zP4KTRl0aHCQrQgm/PlHQydnteJdKe2Spfgr/n eRl/MMlhijqAC3c1yiFw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nCuyV-00E9zC-RW; Thu, 27 Jan 2022 02:57:27 +0000 Received: from mailgw02.mediatek.com ([216.200.240.185]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nCuxg-00E9ZB-Jz; Thu, 27 Jan 2022 02:56:38 +0000 X-UUID: f54da4b8b5d24fae87447009e450c8ac-20220126 X-UUID: f54da4b8b5d24fae87447009e450c8ac-20220126 Received: from mtkcas66.mediatek.inc [(172.29.193.44)] by mailgw02.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 1322380147; Wed, 26 Jan 2022 19:56:33 -0700 Received: from mtkmbs10n2.mediatek.inc (172.21.101.183) by MTKMBS62N1.mediatek.inc (172.29.193.41) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 26 Jan 2022 18:56:00 -0800 Received: from mtkcas10.mediatek.inc (172.21.101.39) by mtkmbs10n2.mediatek.inc (172.21.101.183) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.2.792.3; Thu, 27 Jan 2022 10:55:58 +0800 Received: from localhost.localdomain (10.17.3.154) by mtkcas10.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 27 Jan 2022 10:55:57 +0800 From: Yunfei Dong To: Yunfei Dong , Alexandre Courbot , Hans Verkuil , "Tzung-Bi Shih" , AngeloGioacchino Del Regno , Tiffany Lin , Andrew-CT Chen , Mauro Carvalho Chehab , Rob Herring , Matthias Brugger , Tomasz Figa CC: George Sun , Xiaoyong Lu , Hsin-Yi Wang , Fritz Koenig , Dafna Hirschfeld , Benjamin Gaignard , Daniel Vetter , dri-devel , Irui Wang , Steve Cho , , , , , , , Subject: [PATCH v1, 6/8] media: mtk-vcodec: prevent kernel crash when scp ipi timeout Date: Thu, 27 Jan 2022 10:55:42 +0800 Message-ID: <20220127025544.10854-7-yunfei.dong@mediatek.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220127025544.10854-1-yunfei.dong@mediatek.com> References: <20220127025544.10854-1-yunfei.dong@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220126_185636_684890_EB2602D7 X-CRM114-Status: GOOD ( 12.27 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Tinghan Shen When SCP timeout during playing video, kernel crashes with following message. It's caused by accessing NULL pointer in vpu_dec_ipi_handler. This patch doesn't solve the root cause of NULL pointer, but merely prevent kernel crashed when encounter the NULL pointer. After applied this patch, kernel keeps alive, only the video player turns to green screen. [67242.065474] pc : vpu_dec_ipi_handler+0xa0/0xb20 [mtk_vcodec_dec] [67242.065485] [MTK_V4L2] level=0 fops_vcodec_open(),334: 18000000.vcodec_dec decoder [135] [67242.065523] lr : scp_ipi_handler+0x11c/0x244 [mtk_scp] [67242.065540] sp : ffffffbb4207fb10 [67242.065557] x29: ffffffbb4207fb30 x28: ffffffd00a1d5000 [67242.065592] x27: 1ffffffa0143aa24 x26: 0000000000000000 [67242.065625] x25: dfffffd000000000 x24: ffffffd0168bfdb0 [67242.065659] x23: 1ffffff76840ff74 x22: ffffffbb41fa8a88 [67242.065692] x21: ffffffbb4207fb9c x20: ffffffbb4207fba0 [67242.065725] x19: ffffffbb4207fb98 x18: 0000000000000000 [67242.065758] x17: 0000000000000000 x16: ffffffd042022094 [67242.065791] x15: 1ffffff77ed4b71a x14: 1ffffff77ed4b719 [67242.065824] x13: 0000000000000000 x12: 0000000000000000 [67242.065857] x11: 0000000000000000 x10: dfffffd000000001 [67242.065890] x9 : 0000000000000000 x8 : 0000000000000002 [67242.065923] x7 : 0000000000000000 x6 : 000000000000003f [67242.065956] x5 : 0000000000000040 x4 : ffffffffffffffe0 [67242.065989] x3 : ffffffd043b841b8 x2 : 0000000000000000 [67242.066021] x1 : 0000000000000010 x0 : 0000000000000010 [67242.066055] Call trace: [67242.066092] vpu_dec_ipi_handler+0xa0/0xb20 [mtk_vcodec_dec 12220d230d83a7426fc38c56b3e7bc6066955bae] [67242.066119] scp_ipi_handler+0x11c/0x244 [mtk_scp 8fb69c2ef141dd3192518b952b65aba35627b8bf] [67242.066145] mt8192_scp_irq_handler+0x70/0x128 [mtk_scp 8fb69c2ef141dd3192518b952b65aba35627b8bf] [67242.066172] scp_irq_handler+0xa0/0x114 [mtk_scp 8fb69c2ef141dd3192518b952b65aba35627b8bf] [67242.066200] irq_thread_fn+0x84/0xf8 [67242.066220] irq_thread+0x170/0x1ec [67242.066242] kthread+0x2f8/0x3b8 [67242.066264] ret_from_fork+0x10/0x30 [67242.066292] Code: 38f96908 35003628 91004340 d343fc08 (38f96908) Signed-off-by: Tinghan Shen Signed-off-by: Yunfei Dong --- drivers/media/platform/mtk-vcodec/vdec_vpu_if.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/media/platform/mtk-vcodec/vdec_vpu_if.c b/drivers/media/platform/mtk-vcodec/vdec_vpu_if.c index 35f4d5583084..1041dd663e76 100644 --- a/drivers/media/platform/mtk-vcodec/vdec_vpu_if.c +++ b/drivers/media/platform/mtk-vcodec/vdec_vpu_if.c @@ -91,6 +91,11 @@ static void vpu_dec_ipi_handler(void *data, unsigned int len, void *priv) struct vdec_vpu_inst *vpu = (struct vdec_vpu_inst *) (unsigned long)msg->ap_inst_addr; + if (!vpu) { + mtk_v4l2_err("ap_inst_addr is NULL"); + return; + } + mtk_vcodec_debug(vpu, "+ id=%X", msg->msg_id); vpu->failure = msg->status;