From: Suzuki K Poulose suzuki.poulose@arm.com
commit 5511c0c309db4c526a6e9f8b2b8a1483771574bc upstream.
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
--- drivers/hwtracing/coresight/coresight-etm-perf.c | 1 + 1 file changed, 1 insertion(+)
--- 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 cor /* 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(pdev, name, GFP_KERNEL); if (!ea->attr.attr.name) return -ENOMEM;