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Sun, 02 Oct 2022 19:48:55 -0700 Received: from mtkcas11.mediatek.inc (172.21.101.40) by mtkmbs11n1.mediatek.inc (172.21.101.185) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.2.792.15; Mon, 3 Oct 2022 10:48:19 +0800 Received: from mtksdccf07 (172.21.84.99) by mtkcas11.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Mon, 3 Oct 2022 10:48:19 +0800 Message-ID: Subject: Re: [PATCH v1 2/2] media: platform: mtk-mdp3: fix error handling about components clock_on From: moudy ho To: AngeloGioacchino Del Regno , Mauro Carvalho Chehab , Matthias Brugger , Hans Verkuil CC: , , , Date: Mon, 3 Oct 2022 10:48:19 +0800 In-Reply-To: <8afa9c8e-079e-6e50-a8d7-21e0b1698f76@collabora.com> References: <20220930102306.13201-1-moudy.ho@mediatek.com> <20220930102306.13201-3-moudy.ho@mediatek.com> <8afa9c8e-079e-6e50-a8d7-21e0b1698f76@collabora.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.2 MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221002_194905_792249_92213A1B X-CRM114-Status: GOOD ( 23.02 ) X-BeenThere: linux-mediatek@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-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org On Fri, 2022-09-30 at 14:12 +0200, AngeloGioacchino Del Regno wrote: > Il 30/09/22 12:23, Moudy Ho ha scritto: > > Add goto statement in mdp_comp_clock_on() to avoid error code not > > being > > propagated or returning positive values. > > This change also performs a well-timed clock_off when an error > > occurs, and > > reduces unnecessary error logging in mdp_cmdq_send(). > > > > Fixes: 61890ccaefaf ("media: platform: mtk-mdp3: add MediaTek MDP3 > > driver") > > Signed-off-by: Moudy Ho > > --- > > .../platform/mediatek/mdp3/mtk-mdp3-cmdq.c | 4 +--- > > .../platform/mediatek/mdp3/mtk-mdp3-comp.c | 24 > > ++++++++++++++----- > > 2 files changed, 19 insertions(+), 9 deletions(-) > > > > diff --git a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c > > b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c > > index e194dec8050a..124c1b96e96b 100644 > > --- a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c > > +++ b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c > > @@ -433,10 +433,8 @@ int mdp_cmdq_send(struct mdp_dev *mdp, struct > > mdp_cmdq_param *param) > > cmd->mdp_ctx = param->mdp_ctx; > > > > ret = mdp_comp_clocks_on(&mdp->pdev->dev, cmd->comps, cmd- > > >num_comps); > > - if (ret) { > > - dev_err(dev, "comp %d failed to enable clock!\n", ret); > > + if (ret) > > goto err_free_path; > > - } > > > > dma_sync_single_for_device(mdp->cmdq_clt->chan->mbox->dev, > > cmd->pkt.pa_base, cmd- > > >pkt.cmd_buf_size, > > diff --git a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-comp.c > > b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-comp.c > > index d3eaf8884412..fe6a39315e88 100644 > > --- a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-comp.c > > +++ b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-comp.c > > @@ -699,12 +699,22 @@ int mdp_comp_clock_on(struct device *dev, > > struct mdp_comp *comp) > > dev_err(dev, > > "Failed to enable clk %d. type:%d > > id:%d\n", > > i, comp->type, comp->id); > > - pm_runtime_put(comp->comp_dev); > > - return ret; > > + goto err_unwind; > > } > > } > > > > return 0; > > + > > +err_unwind: > > For this label to be clearer, I would rename it as `err_revert`, or > `clocks_off`, or even simply `err`, as the `unwind` word may create > some confusion here. > Hi Angelo, Thanks for the suggestion to rename to "err_revert" and make the flow more readable. I will correct it in the next version. Regards, Moudy > > + while (--i >= 0) { > > + if (IS_ERR_OR_NULL(comp->clks[i])) > > + continue; > > + clk_disable_unprepare(comp->clks[i]); > > + } > > + if (comp->comp_dev) > > + pm_runtime_put_sync(comp->comp_dev); > > + > > + return ret; > > } > > > > void mdp_comp_clock_off(struct device *dev, struct mdp_comp > > *comp) > > @@ -723,11 +733,13 @@ void mdp_comp_clock_off(struct device *dev, > > struct mdp_comp *comp) > > > > int mdp_comp_clocks_on(struct device *dev, struct mdp_comp > > *comps, int num) > > { > > - int i; > > + int i, ret; > > > > - for (i = 0; i < num; i++) > > - if (mdp_comp_clock_on(dev, &comps[i]) != 0) > > - return ++i; > > + for (i = 0; i < num; i++) { > > + ret = mdp_comp_clock_on(dev, &comps[i]); > > + if (ret) > > + return ret; > > + } > > > > return 0; > > } > >