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[199.106.103.254]) by smtp.gmail.com with ESMTPSA id to5sm527525pac.33.2015.08.04.16.36.03 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 04 Aug 2015 16:36:04 -0700 (PDT) From: Lina Iyer To: rjw@rjwysocki.net, ulf.hansson@linaro.org, khilman@linaro.org Subject: [PATCH 1/9] PM / Domains: Allocate memory outside domain locks Date: Tue, 4 Aug 2015 17:35:31 -0600 Message-Id: <1438731339-58317-2-git-send-email-lina.iyer@linaro.org> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1438731339-58317-1-git-send-email-lina.iyer@linaro.org> References: <1438731339-58317-1-git-send-email-lina.iyer@linaro.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150804_163626_374748_0D252643 X-CRM114-Status: GOOD ( 14.97 ) X-Spam-Score: -2.6 (--) X-Spam-Report: SpamAssassin version 3.4.0 on bombadil.infradead.org summary: Content analysis details: (-2.6 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [209.85.220.47 listed in list.dnswl.org] -0.0 RCVD_IN_MSPIKE_H2 RBL: Average reputation (+2) [209.85.220.47 listed in wl.mailspike.net] -0.0 SPF_PASS SPF: sender matches SPF record -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: k.kozlowski@samsung.com, linux-pm@vger.kernel.org, sboyd@codeaurora.org, msivasub@codeaurora.org, geert@linux-m68k.org, Lina Iyer , agross@codeaurora.org, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+incoming-imx=patchwork.ozlabs.org@lists.infradead.org List-Id: linux-imx-kernel.lists.patchwork.ozlabs.org In preparation for supporting IRQ-safe domains, allocate domain data outside the domain locks. These functions are not called in an atomic context, so we can always allocate memory using GFP_KERNEL. By allocating memory before the locks, we can safely lock the domain using spinlocks instead of mutexes. Cc: Ulf Hansson Cc: Rafael J. Wysocki Cc: Kevin Hilman Cc: Geert Uytterhoeven Cc: Krzysztof Kozłowski Signed-off-by: Lina Iyer Reviewed-by: Kevin Hilman Acked-by: Ulf Hansson --- drivers/base/power/domain.c | 30 +++++++++++++++--------------- 1 file changed, 15 insertions(+), 15 deletions(-) diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 7666a1c..5fd1306 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -1382,13 +1382,17 @@ int pm_genpd_remove_device(struct generic_pm_domain *genpd, int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, struct generic_pm_domain *subdomain) { - struct gpd_link *link; + struct gpd_link *link, *itr; int ret = 0; if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) || genpd == subdomain) return -EINVAL; + link = kzalloc(sizeof(*link), GFP_KERNEL); + if (!link) + return -ENOMEM; + mutex_lock(&genpd->lock); mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); @@ -1398,18 +1402,13 @@ int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, goto out; } - list_for_each_entry(link, &genpd->master_links, master_node) { - if (link->slave == subdomain && link->master == genpd) { + list_for_each_entry(itr, &genpd->master_links, master_node) { + if (itr->slave == subdomain && itr->master == genpd) { ret = -EINVAL; goto out; } } - link = kzalloc(sizeof(*link), GFP_KERNEL); - if (!link) { - ret = -ENOMEM; - goto out; - } link->master = genpd; list_add_tail(&link->master_node, &genpd->master_links); link->slave = subdomain; @@ -1420,7 +1419,8 @@ int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, out: mutex_unlock(&subdomain->lock); mutex_unlock(&genpd->lock); - + if (ret) + kfree(link); return ret; } @@ -1511,17 +1511,17 @@ int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int state) if (IS_ERR_OR_NULL(genpd) || state < 0) return -EINVAL; + cpuidle_data = kzalloc(sizeof(*cpuidle_data), GFP_KERNEL); + if (!cpuidle_data) + return -ENOMEM; + mutex_lock(&genpd->lock); if (genpd->cpuidle_data) { ret = -EEXIST; - goto out; - } - cpuidle_data = kzalloc(sizeof(*cpuidle_data), GFP_KERNEL); - if (!cpuidle_data) { - ret = -ENOMEM; - goto out; + goto err_drv; } + cpuidle_drv = cpuidle_driver_ref(); if (!cpuidle_drv) { ret = -ENODEV;