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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Dec 2024 10:13:22.0734 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 641d25af-e144-4002-8ba6-08dd240398ab X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: DB1PEPF000509F4.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PAVPR08MB9601 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241224_021331_692520_8AF1F503 X-CRM114-Status: GOOD ( 14.74 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi James. > > diff --git a/drivers/hwtracing/coresight/coresight-syscfg.c b/drivers/hwtracing/coresight/coresight-syscfg.c > > index a70c1454b410..dfa7dcbaf25d 100644 > > --- a/drivers/hwtracing/coresight/coresight-syscfg.c > > +++ b/drivers/hwtracing/coresight/coresight-syscfg.c > > @@ -953,7 +953,8 @@ int cscfg_config_sysfs_activate(struct cscfg_config_desc *config_desc, bool acti > > cscfg_mgr->sysfs_active_config = cfg_hash; > > } else { > > /* disable if matching current value */ > > - if (cscfg_mgr->sysfs_active_config == cfg_hash) { > > + if (cscfg_mgr->sysfs_active_config == cfg_hash && > > + !atomic_read(&cscfg_mgr->sys_enable_cnt)) { > > _cscfg_deactivate_config(cfg_hash); > > So is sys_enable_cnt a global value? If a fix is needed doesn't it need to > be a per-config refcount? > > Say you have two active configs, sys_enable_cnt is now 2, how do you disable > one without it always skipping here when the other config is enabled? Sorry to miss this one!. Because when one configuration is enabled, cscfg_mgr->sysfs_active_config becomes !NULL, so it wouldn't happen there is no two activate configurations. so sys_enable_cnt wouldn't be 2.