diff options
Diffstat (limited to 'drivers/hwtracing/coresight/coresight.c')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c index 7bf00a0beb6f..4383324ec01c 100644 --- a/drivers/hwtracing/coresight/coresight.c +++ b/drivers/hwtracing/coresight/coresight.c @@ -498,6 +498,9 @@ int coresight_enable(struct coresight_device *csdev) { int cpu, ret = 0; struct list_head *path; + enum coresight_dev_subtype_source subtype; + + subtype = csdev->subtype.source_subtype; mutex_lock(&coresight_mutex); @@ -505,8 +508,16 @@ int coresight_enable(struct coresight_device *csdev) if (ret) goto out; - if (csdev->enable) + if (csdev->enable) { + /* + * There could be multiple applications driving the software + * source. So keep the refcount for each such user when the + * source is already enabled. + */ + if (subtype == CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE) + atomic_inc(csdev->refcnt); goto out; + } path = coresight_build_path(csdev); if (IS_ERR(path)) { @@ -523,7 +534,7 @@ int coresight_enable(struct coresight_device *csdev) if (ret) goto err_source; - switch (csdev->subtype.source_subtype) { + switch (subtype) { case CORESIGHT_DEV_SUBTYPE_SOURCE_PROC: /* * When working from sysFS it is important to keep track |