From: Mathieu Poirier <mathieu.poirier@linaro.org> To: gregkh@linuxfoundation.org Cc: linux-arm-kernel@lists.infradead.org, suzuki.poulose@arm.com Subject: [PATCH 1/1] coresight: Fix DEBUG_LOCKS_WARN_ON for uninitialized attribute Date: Thu, 1 Aug 2019 11:23:23 -0600 Message-ID: <20190801172323.18359-2-mathieu.poirier@linaro.org> (raw) In-Reply-To: <20190801172323.18359-1-mathieu.poirier@linaro.org> From: Suzuki K Poulose <suzuki.poulose@arm.com> While running the linux-next with CONFIG_DEBUG_LOCKS_ALLOC enabled, I get the following splat. BUG: key ffffcb5636929298 has not been registered! ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(1) WARNING: CPU: 1 PID: 53 at kernel/locking/lockdep.c:3669 lockdep_init_map+0x164/0x1f0 CPU: 1 PID: 53 Comm: kworker/1:1 Tainted: G W 5.2.0-next-20190712-00015-g00ad4634222e-dirty #603 Workqueue: events amba_deferred_retry_func pstate: 60c00005 (nZCv daif +PAN +UAO) pc : lockdep_init_map+0x164/0x1f0 lr : lockdep_init_map+0x164/0x1f0 [ trimmed ] Call trace: lockdep_init_map+0x164/0x1f0 __kernfs_create_file+0x9c/0x158 sysfs_add_file_mode_ns+0xa8/0x1d0 sysfs_add_file_to_group+0x88/0xd8 etm_perf_add_symlink_sink+0xcc/0x138 coresight_register+0x110/0x280 tmc_probe+0x160/0x420 [ trimmed ] ---[ end trace ab4cc669615ba1b0 ]--- Fix this by initialising the dynamically allocated attribute properly. Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Fixes: bb8e370bdc141ddf ("coresight: perf: Add "sinks" group to PMU directory") Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> [Fixed a typograhic error in the changelog] Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> --- drivers/hwtracing/coresight/coresight-etm-perf.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c index 5c1ca0df5cb0..84f1dcb69827 100644 --- a/drivers/hwtracing/coresight/coresight-etm-perf.c +++ b/drivers/hwtracing/coresight/coresight-etm-perf.c @@ -544,6 +544,7 @@ int etm_perf_add_symlink_sink(struct coresight_device *csdev) /* See function coresight_get_sink_by_id() to know where this is used */ hash = hashlen_hash(hashlen_string(NULL, name)); + sysfs_attr_init(&ea->attr.attr); ea->attr.attr.name = devm_kstrdup(dev, name, GFP_KERNEL); if (!ea->attr.attr.name) return -ENOMEM; -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply index Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-08-01 17:23 [PATCH 0/1] coresight: Fix for v5.3-rc3 Mathieu Poirier 2019-08-01 17:23 ` Mathieu Poirier [this message] 2019-08-01 18:50 ` [PATCH 1/1] coresight: Fix DEBUG_LOCKS_WARN_ON for uninitialized attribute Greg KH 2019-08-01 20:20 ` Mathieu Poirier 2019-08-01 20:26 ` Greg KH 2019-08-01 18:17 ` [PATCH 0/1] coresight: Fix for v5.3-rc3 Greg KH 2019-08-01 20:16 ` Mathieu Poirier 2019-08-02 9:10 ` Greg KH 2019-08-04 13:26 ` Mathieu Poirier
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