coresight: holding cscfg_csdev_lock while removing cscfg from csdev

There'll be possible race scenario for coresight config:

CPU0                                          CPU1
(perf enable)                                 load module
                                              cscfg_load_config_sets()
                                              activate config. // sysfs
                                              (sys_active_cnt == 1)
...
cscfg_csdev_enable_active_config()
  lock(csdev->cscfg_csdev_lock)
                                              deactivate config // sysfs
                                              (sys_activec_cnt == 0)
                                              cscfg_unload_config_sets()
  <iterating config_csdev_list>               cscfg_remove_owned_csdev_configs()
  // here load config activate by CPU1
  unlock(csdev->cscfg_csdev_lock)

iterating config_csdev_list could be raced with config_csdev_list's
entry delete.

To resolve this race , hold csdev->cscfg_csdev_lock() while
cscfg_remove_owned_csdev_configs()

Fixes: 02bd588 ("coresight: configuration: Update API to permit dynamic load/unload")
Signed-off-by: Yeoreum Yun <[email protected]>
Reviewed-by: Leo Yan <[email protected]>
Signed-off-by: Suzuki K Poulose <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: LeviYeoReum

drivers/hwtracing/coresight/coresight-syscfg.c

@@ -395,6 +395,8 @@ static void cscfg_remove_owned_csdev_configs(struct coresight_device *csdev, voi
 	if (list_empty(&csdev->config_csdev_list))
 		return;
 
+  guard(raw_spinlock_irqsave)(&csdev->cscfg_csdev_lock);
+
 	list_for_each_entry_safe(config_csdev, tmp, &csdev->config_csdev_list, node) {
 		if (config_csdev->config_desc->load_owner == load_owner)
 			list_del(&config_csdev->node);