diff options
Diffstat (limited to 'drivers/hwtracing/coresight/coresight-core.c')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-core.c | 30 |
1 files changed, 23 insertions, 7 deletions
diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c index d7f0e231feb9..965bb6d4e1bf 100644 --- a/drivers/hwtracing/coresight/coresight-core.c +++ b/drivers/hwtracing/coresight/coresight-core.c @@ -441,8 +441,26 @@ static void coresight_disable_helpers(struct coresight_device *csdev) } } +/* + * Helper function to call source_ops(csdev)->disable and also disable the + * helpers. + * + * There is an imbalance between coresight_enable_path() and + * coresight_disable_path(). Enabling also enables the source's helpers as part + * of the path, but disabling always skips the first item in the path (which is + * the source), so sources and their helpers don't get disabled as part of that + * function and we need the extra step here. + */ +void coresight_disable_source(struct coresight_device *csdev, void *data) +{ + if (source_ops(csdev)->disable) + source_ops(csdev)->disable(csdev, data); + coresight_disable_helpers(csdev); +} +EXPORT_SYMBOL_GPL(coresight_disable_source); + /** - * coresight_disable_source - Drop the reference count by 1 and disable + * coresight_disable_source_sysfs - Drop the reference count by 1 and disable * the device if there are no users left. * * @csdev: The coresight device to disable @@ -451,17 +469,15 @@ static void coresight_disable_helpers(struct coresight_device *csdev) * * Returns true if the device has been disabled. */ -bool coresight_disable_source(struct coresight_device *csdev, void *data) +static bool coresight_disable_source_sysfs(struct coresight_device *csdev, + void *data) { if (atomic_dec_return(&csdev->refcnt) == 0) { - if (source_ops(csdev)->disable) - source_ops(csdev)->disable(csdev, data); - coresight_disable_helpers(csdev); + coresight_disable_source(csdev, data); csdev->enable = false; } return !csdev->enable; } -EXPORT_SYMBOL_GPL(coresight_disable_source); /* * coresight_disable_path_from : Disable components in the given path beyond @@ -1204,7 +1220,7 @@ void coresight_disable(struct coresight_device *csdev) if (ret) goto out; - if (!csdev->enable || !coresight_disable_source(csdev, NULL)) + if (!csdev->enable || !coresight_disable_source_sysfs(csdev, NULL)) goto out; switch (csdev->subtype.source_subtype) { |