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Fri, 23 Aug 2024 05:51:37 -0700 (PDT) Received: from [127.0.1.1] ([178.197.222.82]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a868f4f384bsm255931666b.192.2024.08.23.05.51.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 23 Aug 2024 05:51:37 -0700 (PDT) From: Krzysztof Kozlowski Date: Fri, 23 Aug 2024 14:51:10 +0200 Subject: [PATCH 06/10] pmdomain: qcom: cpr: Simplify locking with guard() Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240823-cleanup-h-guard-pm-domain-v1-6-8320722eaf39@linaro.org> References: <20240823-cleanup-h-guard-pm-domain-v1-0-8320722eaf39@linaro.org> In-Reply-To: <20240823-cleanup-h-guard-pm-domain-v1-0-8320722eaf39@linaro.org> To: Ulf Hansson , Heiko Stuebner , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Bjorn Andersson , Konrad Dybcio , Geert Uytterhoeven , Magnus Damm Cc: linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org, imx@lists.linux.dev, linux-arm-msm@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Krzysztof Kozlowski X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; 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a=openpgp; fpr=9BD07E0E0C51F8D59677B7541B93437D3B41629B Simplify error handling (less gotos) over locks with guard(). Signed-off-by: Krzysztof Kozlowski Reviewed-by: Konrad Dybcio --- drivers/pmdomain/qcom/cpr.c | 57 ++++++++++++++++++--------------------------- 1 file changed, 23 insertions(+), 34 deletions(-) diff --git a/drivers/pmdomain/qcom/cpr.c b/drivers/pmdomain/qcom/cpr.c index 1bef89712188..a616a3ec3d46 100644 --- a/drivers/pmdomain/qcom/cpr.c +++ b/drivers/pmdomain/qcom/cpr.c @@ -4,6 +4,7 @@ * Copyright (c) 2019, Linaro Limited */ +#include #include #include #include @@ -747,9 +748,9 @@ static int cpr_set_performance_state(struct generic_pm_domain *domain, struct cpr_drv *drv = container_of(domain, struct cpr_drv, pd); struct corner *corner, *end; enum voltage_change_dir dir; - int ret = 0, new_uV; + int ret, new_uV; - mutex_lock(&drv->lock); + guard(mutex)(&drv->lock); dev_dbg(drv->dev, "%s: setting perf state: %u (prev state: %u)\n", __func__, state, cpr_get_cur_perf_state(drv)); @@ -760,10 +761,8 @@ static int cpr_set_performance_state(struct generic_pm_domain *domain, */ corner = drv->corners + state - 1; end = &drv->corners[drv->num_corners - 1]; - if (corner > end || corner < drv->corners) { - ret = -EINVAL; - goto unlock; - } + if (corner > end || corner < drv->corners) + return -EINVAL; /* Determine direction */ if (drv->corner > corner) @@ -783,7 +782,7 @@ static int cpr_set_performance_state(struct generic_pm_domain *domain, ret = cpr_scale_voltage(drv, corner, new_uV, dir); if (ret) - goto unlock; + return ret; if (cpr_is_allowed(drv)) { cpr_irq_clr(drv); @@ -794,10 +793,7 @@ static int cpr_set_performance_state(struct generic_pm_domain *domain, drv->corner = corner; -unlock: - mutex_unlock(&drv->lock); - - return ret; + return 0; } static int @@ -1443,9 +1439,9 @@ static int cpr_pd_attach_dev(struct generic_pm_domain *domain, { struct cpr_drv *drv = container_of(domain, struct cpr_drv, pd); const struct acc_desc *acc_desc = drv->acc_desc; - int ret = 0; + int ret; - mutex_lock(&drv->lock); + guard(mutex)(&drv->lock); dev_dbg(drv->dev, "attach callback for: %s\n", dev_name(dev)); @@ -1457,7 +1453,7 @@ static int cpr_pd_attach_dev(struct generic_pm_domain *domain, * additional initialization when further CPUs get attached. */ if (drv->attached_cpu_dev) - goto unlock; + return 0; /* * cpr_scale_voltage() requires the direction (if we are changing @@ -1469,11 +1465,10 @@ static int cpr_pd_attach_dev(struct generic_pm_domain *domain, * the first time cpr_set_performance_state() is called. */ drv->cpu_clk = devm_clk_get(dev, NULL); - if (IS_ERR(drv->cpu_clk)) { - ret = dev_err_probe(drv->dev, PTR_ERR(drv->cpu_clk), - "could not get cpu clk\n"); - goto unlock; - } + if (IS_ERR(drv->cpu_clk)) + return dev_err_probe(drv->dev, PTR_ERR(drv->cpu_clk), + "could not get cpu clk\n"); + drv->attached_cpu_dev = dev; dev_dbg(drv->dev, "using cpu clk from: %s\n", @@ -1490,42 +1485,39 @@ static int cpr_pd_attach_dev(struct generic_pm_domain *domain, ret = dev_pm_opp_get_opp_count(&drv->pd.dev); if (ret < 0) { dev_err(drv->dev, "could not get OPP count\n"); - goto unlock; + return ret; } drv->num_corners = ret; if (drv->num_corners < 2) { dev_err(drv->dev, "need at least 2 OPPs to use CPR\n"); - ret = -EINVAL; - goto unlock; + return -EINVAL; } drv->corners = devm_kcalloc(drv->dev, drv->num_corners, sizeof(*drv->corners), GFP_KERNEL); - if (!drv->corners) { - ret = -ENOMEM; - goto unlock; - } + if (!drv->corners) + return -ENOMEM; ret = cpr_corner_init(drv); if (ret) - goto unlock; + return ret; cpr_set_loop_allowed(drv); ret = cpr_init_parameters(drv); if (ret) - goto unlock; + return ret; /* Configure CPR HW but keep it disabled */ ret = cpr_config(drv); if (ret) - goto unlock; + return ret; ret = cpr_find_initial_corner(drv); if (ret) - goto unlock; + return ret; if (acc_desc->config) regmap_multi_reg_write(drv->tcsr, acc_desc->config, @@ -1540,10 +1532,7 @@ static int cpr_pd_attach_dev(struct generic_pm_domain *domain, dev_info(drv->dev, "driver initialized with %u OPPs\n", drv->num_corners); -unlock: - mutex_unlock(&drv->lock); - - return ret; + return 0; } static int cpr_debug_info_show(struct seq_file *s, void *unused)