If an IIO driver uses callbacks from another IIO driver and calls
iio_channel_start_all_cb() from one of its buffer setup ops, then
lockdep complains due to the lock nesting, as in the below example with
lmp91000.
Since the locks are being taken on different IIO devices, there is no
actual deadlock. Fix the warning by telling lockdep to use a different
class for each iio_device.
============================================
WARNING: possible recursive locking detected
--------------------------------------------
python3/23 is trying to acquire lock:
(&indio_dev->mlock){+.+.}-{3:3}, at: iio_update_buffers
but task is already holding lock:
(&indio_dev->mlock){+.+.}-{3:3}, at: enable_store
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(&indio_dev->mlock);
lock(&indio_dev->mlock);
*** DEADLOCK ***
May be due to missing lock nesting notation
5 locks held by python3/23:
#0: (sb_writers#5){.+.+}-{0:0}, at: ksys_write
#1: (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter
#2: (kn->active#14){.+.+}-{0:0}, at: kernfs_fop_write_iter
#3: (&indio_dev->mlock){+.+.}-{3:3}, at: enable_store
#4: (&iio_dev_opaque->info_exist_lock){+.+.}-{3:3}, at: iio_update_buffers
Call Trace:
__mutex_lock
iio_update_buffers
iio_channel_start_all_cb
lmp91000_buffer_postenable
__iio_update_buffers
enable_store
Fixes: 67e17300dc1d76 ("iio: potentiostat: add LMP91000 support")
Signed-off-by: Vincent Whitchurch <vincent.whitchurch@xxxxxxxx>
---
Notes:
v2:
- Use a different lockdep class for each iio_device, instead of using
mutex_lock_nested.
- Add fixes tag pointing to first IIO driver which used this API.
- Trim call stack in commit message.
drivers/iio/industrialio-core.c | 5 +++++
include/linux/iio/iio-opaque.h | 2 ++
2 files changed, 7 insertions(+)
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 0f4dbda3b9d3..921d8e8643a2 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -1621,6 +1621,8 @@ static void iio_dev_release(struct device *device)
iio_device_detach_buffers(indio_dev);
+ lockdep_unregister_key(&iio_dev_opaque->mlock_key);
+
ida_free(&iio_ida, iio_dev_opaque->id);
kfree(iio_dev_opaque);
}
@@ -1680,6 +1682,9 @@ struct iio_dev *iio_device_alloc(struct device *parent, int sizeof_priv)
INIT_LIST_HEAD(&iio_dev_opaque->buffer_list);
INIT_LIST_HEAD(&iio_dev_opaque->ioctl_handlers);
+ lockdep_register_key(&iio_dev_opaque->mlock_key);
+ lockdep_set_class(&indio_dev->mlock, &iio_dev_opaque->mlock_key);
+
return indio_dev;
}
EXPORT_SYMBOL(iio_device_alloc);
diff --git a/include/linux/iio/iio-opaque.h b/include/linux/iio/iio-opaque.h
index 6b3586b3f952..d1f8b30a7c8b 100644
--- a/include/linux/iio/iio-opaque.h
+++ b/include/linux/iio/iio-opaque.h
@@ -11,6 +11,7 @@
* checked by device drivers but should be considered
* read-only as this is a core internal bit
* @driver_module: used to make it harder to undercut users
+ * @mlock_key: lockdep class for iio_dev lock
* @info_exist_lock: lock to prevent use during removal
* @trig_readonly: mark the current trigger immutable
* @event_interface: event chrdevs associated with interrupt lines
@@ -42,6 +43,7 @@ struct iio_dev_opaque {
int currentmode;
int id;
struct module *driver_module;
+ struct lock_class_key mlock_key;
struct mutex info_exist_lock;
bool trig_readonly;
struct iio_event_interface *event_interface;
--
2.34.1
