The patch below does not apply to the 5.2-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 5511c0c309db4c526a6e9f8b2b8a1483771574bc Mon Sep 17 00:00:00 2001
From: Suzuki K Poulose suzuki.poulose@arm.com Date: Thu, 1 Aug 2019 11:23:23 -0600 Subject: [PATCH] coresight: Fix DEBUG_LOCKS_WARN_ON for uninitialized attribute
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: bb8e370bdc14 ("coresight: perf: Add "sinks" group to PMU directory") Cc: stable stable@vger.kernel.org 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 Link: https://lore.kernel.org/r/20190801172323.18359-2-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
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;