3.18-stable review patch. If anyone has any objections, please let me know.
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From: Ben Hutchings ben.hutchings@codethink.co.uk
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 amsfield22@gmail.com Cc: Jonathan Cameron jic23@kernel.org Signed-off-by: Ben Hutchings ben.hutchings@codethink.co.uk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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: rtc_class_close(trig_info->rtc); error_free_trig_info: kfree(trig_info); -error_put_trigger_and_remove_from_list: +error_free_trigger_and_remove_from_list: list_del(&trig->alloc_list); - iio_trigger_put(trig); + iio_trigger_free(trig); error_free_completed_registrations: list_for_each_entry_safe(trig, trig2,