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 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 D4820C433F5 for ; Tue, 8 Feb 2022 13:03:33 +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=cPIgotlfgRXWlkoGP4fldo/W5lH4qNUMFv6bAGDiuR8=; b=4XA8BdwEcaVMHn wAMgoVt+n4jc9MX/hDVhSm6/ShcxNRqg9adjIHtSSyzF+MpNKN6Pk7AFR4P+TCm+nQu9qpRPzSeYl jDiG/9GzLlxkGmEZVkdMH02xts6pTKkr6h/3UAefMjlI0Paj6ZPg8cSCP8YUIHYjMCp834hfYKjSm WJumymaGWEgbVuiuNaoK462WjJGpidDMwil68Ridr8iqhypKtNi0jdxtMMuen39xA6sdVOr4yNQ+F sDF6Adnvc3lOINbt75Aa1CfRWOH30aTEoJ7FzrAo1mEKyNQcfv2JvqMN9LHG0ifSy9fY+ZOLoHDAs IUYDYYcvQ7JdLArDpq+w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nHQ7d-00DwJi-JP; Tue, 08 Feb 2022 13:01:30 +0000 Received: from mail-pf1-x429.google.com ([2607:f8b0:4864:20::429]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nHPoX-00DnhV-Qq for linux-arm-kernel@lists.infradead.org; Tue, 08 Feb 2022 12:41:48 +0000 Received: by mail-pf1-x429.google.com with SMTP id n32so18631960pfv.11 for ; Tue, 08 Feb 2022 04:41:45 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=zOlNpEXDepZ4yjtrYbOEiToTrqDlKq5iRLx8moaIIHQ=; b=mpvH+3lilXr1A1JO1zFLSNPtwT6aQRcdbO1xuAOunzhTdBkypDvwK6diRK3aANzkFc AchHtI8htBGnpofq5uUFgsLi5WF8yY0WgvyT6jVevIRsEOhvMlw4L9guuf1KRxzRyxFb hsyLlMDVWBp1rQrE0O/0fvF8n3wjymQkcdRlU= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=zOlNpEXDepZ4yjtrYbOEiToTrqDlKq5iRLx8moaIIHQ=; b=ScbUr3MBs9UlNias/LnIB2tJreMqa8bSWar2xtTt6X/i6v6uqJXgky7j9h8RTXMDsB j82AlYbc+I+tl6vt3cVTvewcjxQI+/mFpC4dAtmAa1NQd1uE6K/5+S2vYLHNX33JL6KW oDF8XHjyB8nSqK180QdKCBPwvIzceddLI4F7PcA+rhhuq2u6XhDz5rc2KeAN9i6FdVRE HWcWN7iSQIjogTd/RR3gTC9YSwXLhgGqmlqn2Yxd1F2Prat6eVtR9HrYLImAZHpEDNR1 RHdqWaa1VLkl601C5yVrdmMY20b0ikbAw6f/xjQGIaVvUG3A+Ya0TjClSEBT8c5NSVkl 1WLA== X-Gm-Message-State: AOAM531HAzIw/i4SuIBkTKa1Xihx6YxbO+VuVFrBPCMrjETa7kSAtIjO n8GBT9zOQfpDud4SiwVswh7eYQ== X-Google-Smtp-Source: ABdhPJx3bYQ0yptzfAlsZj/t5fo77StxTCrCRo53y3yujaAJF8VjMwm3Z1dpBlyvAbBVyIdcieibPw== X-Received: by 2002:a05:6a00:1892:: with SMTP id x18mr4206790pfh.20.1644324105289; Tue, 08 Feb 2022 04:41:45 -0800 (PST) Received: from wenstp920.tpe.corp.google.com ([2401:fa00:1:10:41b6:813e:c823:609c]) by smtp.gmail.com with ESMTPSA id h11sm15056939pfe.214.2022.02.08.04.41.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Feb 2022 04:41:45 -0800 (PST) From: Chen-Yu Tsai To: Stephen Boyd , Michael Turquette , Matthias Brugger Cc: Chen-Yu Tsai , Chun-Jie Chen , AngeloGioacchino Del Regno , Miles Chen , linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 26/31] clk: mediatek: mtk: Implement error handling in register APIs Date: Tue, 8 Feb 2022 20:40:29 +0800 Message-Id: <20220208124034.414635-27-wenst@chromium.org> X-Mailer: git-send-email 2.35.0.263.gb82422642f-goog In-Reply-To: <20220208124034.414635-1-wenst@chromium.org> References: <20220208124034.414635-1-wenst@chromium.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220208_044145_963205_E3E4C506 X-CRM114-Status: GOOD ( 19.71 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The remaining clk registration functions do not stop or return errors if any clk failed to be registered, nor do they implement error handling paths. This may result in a partially working device if any step fails. Make the register functions return proper error codes, and bail out if errors occur. Proper cleanup, i.e. unregister any clks that were successfully registered, is done in the new error path. This also makes the |struct clk_data *| argument mandatory, as it is used to track the list of clks registered. Signed-off-by: Chen-Yu Tsai Reviewed-by: Miles Chen Reviewed-by: AngeloGioacchino Del Regno --- drivers/clk/mediatek/clk-mtk.c | 118 ++++++++++++++++++++++++++------- drivers/clk/mediatek/clk-mtk.h | 20 +++--- 2 files changed, 103 insertions(+), 35 deletions(-) diff --git a/drivers/clk/mediatek/clk-mtk.c b/drivers/clk/mediatek/clk-mtk.c index 5618c84e4e08..8f15e9de742e 100644 --- a/drivers/clk/mediatek/clk-mtk.c +++ b/drivers/clk/mediatek/clk-mtk.c @@ -53,16 +53,19 @@ void mtk_free_clk_data(struct clk_onecell_data *clk_data) kfree(clk_data); } -void mtk_clk_register_fixed_clks(const struct mtk_fixed_clk *clks, - int num, struct clk_onecell_data *clk_data) +int mtk_clk_register_fixed_clks(const struct mtk_fixed_clk *clks, int num, + struct clk_onecell_data *clk_data) { int i; struct clk *clk; + if (!clk_data) + return -ENOMEM; + for (i = 0; i < num; i++) { const struct mtk_fixed_clk *rc = &clks[i]; - if (clk_data && !IS_ERR_OR_NULL(clk_data->clks[rc->id])) + if (!IS_ERR_OR_NULL(clk_data->clks[rc->id])) continue; clk = clk_register_fixed_rate(NULL, rc->name, rc->parent, 0, @@ -70,12 +73,26 @@ void mtk_clk_register_fixed_clks(const struct mtk_fixed_clk *clks, if (IS_ERR(clk)) { pr_err("Failed to register clk %s: %pe\n", rc->name, clk); - continue; + goto err; } - if (clk_data) - clk_data->clks[rc->id] = clk; + clk_data->clks[rc->id] = clk; } + + return 0; + +err: + while (--i >= 0) { + const struct mtk_fixed_clk *rc = &clks[i]; + + if (IS_ERR_OR_NULL(clk_data->clks[rc->id])) + continue; + + clk_unregister_fixed_rate(clk_data->clks[rc->id]); + clk_data->clks[rc->id] = ERR_PTR(-ENOENT); + } + + return PTR_ERR(clk); } EXPORT_SYMBOL_GPL(mtk_clk_register_fixed_clks); @@ -99,16 +116,19 @@ void mtk_clk_unregister_fixed_clks(const struct mtk_fixed_clk *clks, int num, } EXPORT_SYMBOL_GPL(mtk_clk_unregister_fixed_clks); -void mtk_clk_register_factors(const struct mtk_fixed_factor *clks, - int num, struct clk_onecell_data *clk_data) +int mtk_clk_register_factors(const struct mtk_fixed_factor *clks, int num, + struct clk_onecell_data *clk_data) { int i; struct clk *clk; + if (!clk_data) + return -ENOMEM; + for (i = 0; i < num; i++) { const struct mtk_fixed_factor *ff = &clks[i]; - if (clk_data && !IS_ERR_OR_NULL(clk_data->clks[ff->id])) + if (!IS_ERR_OR_NULL(clk_data->clks[ff->id])) continue; clk = clk_register_fixed_factor(NULL, ff->name, ff->parent_name, @@ -116,12 +136,26 @@ void mtk_clk_register_factors(const struct mtk_fixed_factor *clks, if (IS_ERR(clk)) { pr_err("Failed to register clk %s: %pe\n", ff->name, clk); - continue; + goto err; } - if (clk_data) - clk_data->clks[ff->id] = clk; + clk_data->clks[ff->id] = clk; + } + + return 0; + +err: + while (--i >= 0) { + const struct mtk_fixed_factor *ff = &clks[i]; + + if (IS_ERR_OR_NULL(clk_data->clks[ff->id])) + continue; + + clk_unregister_fixed_factor(clk_data->clks[ff->id]); + clk_data->clks[ff->id] = ERR_PTR(-ENOENT); } + + return PTR_ERR(clk); } EXPORT_SYMBOL_GPL(mtk_clk_register_factors); @@ -258,13 +292,16 @@ static void mtk_clk_unregister_composite(struct clk *clk) kfree(mux); } -void mtk_clk_register_composites(const struct mtk_composite *mcs, - int num, void __iomem *base, spinlock_t *lock, - struct clk_onecell_data *clk_data) +int mtk_clk_register_composites(const struct mtk_composite *mcs, int num, + void __iomem *base, spinlock_t *lock, + struct clk_onecell_data *clk_data) { struct clk *clk; int i; + if (!clk_data) + return -ENOMEM; + for (i = 0; i < num; i++) { const struct mtk_composite *mc = &mcs[i]; @@ -275,12 +312,26 @@ void mtk_clk_register_composites(const struct mtk_composite *mcs, if (IS_ERR(clk)) { pr_err("Failed to register clk %s: %pe\n", mc->name, clk); - continue; + goto err; } - if (clk_data) - clk_data->clks[mc->id] = clk; + clk_data->clks[mc->id] = clk; + } + + return 0; + +err: + while (--i >= 0) { + const struct mtk_composite *mc = &mcs[i]; + + if (IS_ERR_OR_NULL(clk_data->clks[mcs->id])) + continue; + + mtk_clk_unregister_composite(clk_data->clks[mc->id]); + clk_data->clks[mc->id] = ERR_PTR(-ENOENT); } + + return PTR_ERR(clk); } EXPORT_SYMBOL_GPL(mtk_clk_register_composites); @@ -304,17 +355,20 @@ void mtk_clk_unregister_composites(const struct mtk_composite *mcs, int num, } EXPORT_SYMBOL_GPL(mtk_clk_unregister_composites); -void mtk_clk_register_dividers(const struct mtk_clk_divider *mcds, - int num, void __iomem *base, spinlock_t *lock, - struct clk_onecell_data *clk_data) +int mtk_clk_register_dividers(const struct mtk_clk_divider *mcds, int num, + void __iomem *base, spinlock_t *lock, + struct clk_onecell_data *clk_data) { struct clk *clk; int i; + if (!clk_data) + return -ENOMEM; + for (i = 0; i < num; i++) { const struct mtk_clk_divider *mcd = &mcds[i]; - if (clk_data && !IS_ERR_OR_NULL(clk_data->clks[mcd->id])) + if (!IS_ERR_OR_NULL(clk_data->clks[mcd->id])) continue; clk = clk_register_divider(NULL, mcd->name, mcd->parent_name, @@ -323,12 +377,26 @@ void mtk_clk_register_dividers(const struct mtk_clk_divider *mcds, if (IS_ERR(clk)) { pr_err("Failed to register clk %s: %pe\n", mcd->name, clk); - continue; + goto err; } - if (clk_data) - clk_data->clks[mcd->id] = clk; + clk_data->clks[mcd->id] = clk; + } + + return 0; + +err: + while (--i >= 0) { + const struct mtk_clk_divider *mcd = &mcds[i]; + + if (IS_ERR_OR_NULL(clk_data->clks[mcd->id])) + continue; + + mtk_clk_unregister_composite(clk_data->clks[mcd->id]); + clk_data->clks[mcd->id] = ERR_PTR(-ENOENT); } + + return PTR_ERR(clk); } void mtk_clk_unregister_dividers(const struct mtk_clk_divider *mcds, int num, diff --git a/drivers/clk/mediatek/clk-mtk.h b/drivers/clk/mediatek/clk-mtk.h index 7f902581a115..bf6565aa7319 100644 --- a/drivers/clk/mediatek/clk-mtk.h +++ b/drivers/clk/mediatek/clk-mtk.h @@ -34,8 +34,8 @@ struct mtk_fixed_clk { .rate = _rate, \ } -void mtk_clk_register_fixed_clks(const struct mtk_fixed_clk *clks, int num, - struct clk_onecell_data *clk_data); +int mtk_clk_register_fixed_clks(const struct mtk_fixed_clk *clks, int num, + struct clk_onecell_data *clk_data); void mtk_clk_unregister_fixed_clks(const struct mtk_fixed_clk *clks, int num, struct clk_onecell_data *clk_data); @@ -55,8 +55,8 @@ struct mtk_fixed_factor { .div = _div, \ } -void mtk_clk_register_factors(const struct mtk_fixed_factor *clks, int num, - struct clk_onecell_data *clk_data); +int mtk_clk_register_factors(const struct mtk_fixed_factor *clks, int num, + struct clk_onecell_data *clk_data); void mtk_clk_unregister_factors(const struct mtk_fixed_factor *clks, int num, struct clk_onecell_data *clk_data); @@ -150,9 +150,9 @@ struct mtk_composite { struct clk *mtk_clk_register_composite(const struct mtk_composite *mc, void __iomem *base, spinlock_t *lock); -void mtk_clk_register_composites(const struct mtk_composite *mcs, - int num, void __iomem *base, spinlock_t *lock, - struct clk_onecell_data *clk_data); +int mtk_clk_register_composites(const struct mtk_composite *mcs, int num, + void __iomem *base, spinlock_t *lock, + struct clk_onecell_data *clk_data); void mtk_clk_unregister_composites(const struct mtk_composite *mcs, int num, struct clk_onecell_data *clk_data); @@ -178,9 +178,9 @@ struct mtk_clk_divider { .div_width = _width, \ } -void mtk_clk_register_dividers(const struct mtk_clk_divider *mcds, int num, - void __iomem *base, spinlock_t *lock, - struct clk_onecell_data *clk_data); +int mtk_clk_register_dividers(const struct mtk_clk_divider *mcds, int num, + void __iomem *base, spinlock_t *lock, + struct clk_onecell_data *clk_data); void mtk_clk_unregister_dividers(const struct mtk_clk_divider *mcds, int num, struct clk_onecell_data *clk_data); -- 2.35.0.263.gb82422642f-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel