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Subject[PATCH 3.18 49/67] iio: iio-trig-periodic-rtc: Free trigger resource correctly
3.18-stable review patch.  If anyone has any objections, please let me know.


From: Ben Hutchings <>

This is based on upstream commit 10e840dfb0b7, which did not touch the
iio-trig-periodic-rtc driver because it has been removed upstream.

The following explanation comes from that commit:

These stand-alone trigger drivers were using iio_trigger_put()
where they should have been using iio_trigger_free(). The
iio_trigger_put() adds a module_put which is bad since they
never did a module_get.

In the sysfs driver, module_get/put's are used as triggers are
added & removed. This extra module_put() occurs on an error path
in the probe routine (probably rare).

In the bfin-timer & interrupt trigger drivers, the module resources
are not explicitly managed, so it's doing a put on something that
was never get'd. It occurs on the probe error path and on the
remove path (not so rare).

Tested with the sysfs trigger driver.
The bfin & interrupt drivers were build tested & inspected only.

This was build tested only.

Cc: Alison Schofield <>
Cc: Jonathan Cameron <>
Signed-off-by: Ben Hutchings <>
Signed-off-by: Greg Kroah-Hartman <>
drivers/staging/iio/trigger/iio-trig-periodic-rtc.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/staging/iio/trigger/iio-trig-periodic-rtc.c
+++ b/drivers/staging/iio/trigger/iio-trig-periodic-rtc.c
@@ -137,7 +137,7 @@ static int iio_trig_periodic_rtc_probe(s
trig_info = kzalloc(sizeof(*trig_info), GFP_KERNEL);
if (!trig_info) {
ret = -ENOMEM;
- goto error_put_trigger_and_remove_from_list;
+ goto error_free_trigger_and_remove_from_list;
iio_trigger_set_drvdata(trig, trig_info);
trig->ops = &iio_prtc_trigger_ops;
@@ -164,9 +164,9 @@ error_close_rtc:
- iio_trigger_put(trig);
+ iio_trigger_free(trig);

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