From: Tingwei Zhang <tingwei@codeaurora.org>
To: Mathieu Poirier <mathieu.poirier@linaro.org>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Mike Leach <mike.leach@linaro.org>
Cc: tsoni@codeaurora.org,
Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>,
coresight@lists.linaro.org, Mao Jinlong <jinlmao@codeaurora.org>,
linux-kernel@vger.kernel.org,
Tingwei Zhang <tingwei@codeaurora.org>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH] coresight: cti: remove pm_runtime_get_sync() from CPU hotplug
Date: Tue, 18 Aug 2020 19:10:56 +0800 [thread overview]
Message-ID: <20200818111057.19755-2-tingwei@codeaurora.org> (raw)
In-Reply-To: <20200818111057.19755-1-tingwei@codeaurora.org>
Below BUG is triggered by call pm_runtime_get_sync() in
cti_cpuhp_enable_hw(). It's in CPU hotplug callback with interrupt
disabled. Pm_runtime_get_sync() calls clock driver to enable clock
which could sleep. Remove pm_runtime_get_sync() in cti_cpuhp_enable_hw()
since pm_runtime_get_sync() is called in cti_enabld and pm_runtime_put()
is called in cti_disabled. No need to increase pm count when CPU gets
online since it's not decreased when CPU is offline.
[ 105.800279] BUG: scheduling while atomic: swapper/1/0/0x00000002
[ 105.800290] Modules linked in:
[ 105.800327] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G W
5.9.0-rc1-gff1304be0a05-dirty #21
[ 105.800337] Hardware name: Thundercomm Dragonboard 845c (DT)
[ 105.800353] Call trace:
[ 105.800414] dump_backtrace+0x0/0x1d4
[ 105.800439] show_stack+0x14/0x1c
[ 105.800462] dump_stack+0xc0/0x100
[ 105.800490] __schedule_bug+0x58/0x74
[ 105.800523] __schedule+0x590/0x65c
[ 105.800538] schedule+0x78/0x10c
[ 105.800553] schedule_timeout+0x188/0x250
[ 105.800585] qmp_send.constprop.10+0x12c/0x1b0
[ 105.800599] qmp_qdss_clk_prepare+0x18/0x20
[ 105.800622] clk_core_prepare+0x48/0xd4
[ 105.800639] clk_prepare+0x20/0x34
[ 105.800663] amba_pm_runtime_resume+0x54/0x90
[ 105.800695] __rpm_callback+0xdc/0x138
[ 105.800709] rpm_callback+0x24/0x78
[ 105.800724] rpm_resume+0x328/0x47c
[ 105.800739] __pm_runtime_resume+0x50/0x74
[ 105.800768] cti_starting_cpu+0x40/0xa4
[ 105.800795] cpuhp_invoke_callback+0x84/0x1e0
[ 105.800814] notify_cpu_starting+0x9c/0xb8
[ 105.800834] secondary_start_kernel+0xd8/0x164
[ 105.800933] CPU1: Booted secondary processor 0x0000000100 [0x517f803c]
Fixes: e9b880581d55 ("coresight: cti: Add CPU Hotplug handling to CTI driver")
Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org>
---
drivers/hwtracing/coresight/coresight-cti.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-cti.c b/drivers/hwtracing/coresight/coresight-cti.c
index 869569eb8c7f..baba6af83440 100644
--- a/drivers/hwtracing/coresight/coresight-cti.c
+++ b/drivers/hwtracing/coresight/coresight-cti.c
@@ -126,9 +126,7 @@ static int cti_enable_hw(struct cti_drvdata *drvdata)
static void cti_cpuhp_enable_hw(struct cti_drvdata *drvdata)
{
struct cti_config *config = &drvdata->config;
- struct device *dev = &drvdata->csdev->dev;
- pm_runtime_get_sync(dev->parent);
spin_lock(&drvdata->spinlock);
config->hw_powered = true;
@@ -148,7 +146,6 @@ static void cti_cpuhp_enable_hw(struct cti_drvdata *drvdata)
/* did not re-enable due to no claim / no request */
cti_hp_not_enabled:
spin_unlock(&drvdata->spinlock);
- pm_runtime_put(dev->parent);
}
/* disable hardware */
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
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next prev parent reply other threads:[~2020-08-18 11:12 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-18 11:10 [PATCH] coresight: cti: disclaim device only when it's claimed Tingwei Zhang
2020-08-18 11:10 ` Tingwei Zhang [this message]
2020-08-18 12:47 ` [PATCH] coresight: cti: remove pm_runtime_get_sync() from CPU hotplug Mike Leach
2020-08-18 11:10 ` [PATCH] coresight: cti: write regsiters directly in cti_enable_hw() Tingwei Zhang
2020-08-20 8:06 ` Mike Leach
2020-08-27 18:12 ` Mathieu Poirier
2020-08-28 3:18 ` Tingwei Zhang
2020-08-31 20:28 ` Mathieu Poirier
2020-09-01 6:35 ` Tingwei Zhang
2020-08-27 19:17 ` Mathieu Poirier
2020-08-20 8:12 ` [PATCH] coresight: cti: disclaim device only when it's claimed Mike Leach
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