From ef32df53b73bd29d5bfa4af4fda287baa6dc6544 Mon Sep 17 00:00:00 2001 From: Suzuki K Poulose Date: Wed, 11 Jul 2018 13:40:17 -0600 Subject: [PATCH] coresight: tmc-etr: Disallow perf mode We don't support ETR in perf mode yet. So, don't even try to enable the hardware, even by mistake. Cc: Mathieu Poirier Signed-off-by: Suzuki K Poulose Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman --- drivers/hwtracing/coresight/coresight-tmc-etr.c | 28 ++----------------------- 1 file changed, 2 insertions(+), 26 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c index 1de05c9..18c9a18 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -211,32 +211,8 @@ out: static int tmc_enable_etr_sink_perf(struct coresight_device *csdev) { - int ret = 0; - unsigned long flags; - struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); - - spin_lock_irqsave(&drvdata->spinlock, flags); - if (drvdata->reading) { - ret = -EINVAL; - goto out; - } - - /* - * In Perf mode there can be only one writer per sink. There - * is also no need to continue if the ETR is already operated - * from sysFS. - */ - if (drvdata->mode != CS_MODE_DISABLED) { - ret = -EINVAL; - goto out; - } - - drvdata->mode = CS_MODE_PERF; - tmc_etr_enable_hw(drvdata); -out: - spin_unlock_irqrestore(&drvdata->spinlock, flags); - - return ret; + /* We don't support perf mode yet ! */ + return -EINVAL; } static int tmc_enable_etr_sink(struct coresight_device *csdev, u32 mode) -- 2.7.4