The coresight_disable_source_sysfs function should verify the mode of the coresight device before disabling the source. However, the mode for the TPDM device is always set to CS_MODE_DISABLED, resulting in the check consistently failing. As a result, TPDM cannot be properly disabled. To fix the issue: Configure CS_MODE_SYSFS/CS_MODE_PERF during the enablement of TPDM. Configure CS_MODE_DISABLED during the disablement of TPDM. Fixes: 1f5149c7751c("coresight: Move all sysfs code to sysfs file") Signed-off-by: Jie Gan <quic_jiegan@xxxxxxxxxxx> --- drivers/hwtracing/coresight/coresight-tpdm.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c index a9708ab0d488..90a5105f6199 100644 --- a/drivers/hwtracing/coresight/coresight-tpdm.c +++ b/drivers/hwtracing/coresight/coresight-tpdm.c @@ -449,6 +449,11 @@ static int tpdm_enable(struct coresight_device *csdev, struct perf_event *event, return -EBUSY; } + if (!coresight_take_mode(csdev, mode)) { + spin_unlock(&drvdata->spinlock); + return -EBUSY; + } + __tpdm_enable(drvdata); drvdata->enable = true; spin_unlock(&drvdata->spinlock); @@ -506,6 +511,7 @@ static void tpdm_disable(struct coresight_device *csdev, } __tpdm_disable(drvdata); + coresight_set_mode(csdev, CS_MODE_DISABLED); drvdata->enable = false; spin_unlock(&drvdata->spinlock); -- 2.34.1