| Message ID | 20190812135328.30952-1-suzuki.poulose@arm.com |
|---|---|
| State | New |
| Headers | show |
| Series | coresight: Fix DEBUG_LOCKS_WARN_ON for uninitialized attribute | expand |
On Mon, Aug 12, 2019 at 02:53:28PM +0100, Suzuki K Poulose wrote: > commit 5511c0c309db4c526a6e9f8b2b8a1483771574bc upstream > > While running the linux-next with CONFIG_DEBUG_LOCKS_ALLOC enabled, > I get the following splat. > Thanks for the backport, now queued up. greg k-h
diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c index 3c6294432748..1ef098ff27c3 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(pdev, name, GFP_KERNEL); if (!ea->attr.attr.name) return -ENOMEM;
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. Fixes: bb8e370bdc14 ("coresight: perf: Add "sinks" group to PMU directory") Cc: stable@vger.kernel.org # 5.2.x- Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> --- drivers/hwtracing/coresight/coresight-etm-perf.c | 1 + 1 file changed, 1 insertion(+) -- 2.21.0