[PATCH 6.18 103/314] Input: synaptics_i2c - replace use of system_wq with system_dfl_wq

Sasha Levin
2026-03-10T11:26:18Z

From: Marco Crivellari <marco.crivellari@suse.com>

[ Upstream commit b3ee88e27798f0e8dd3a81867804d693da74d57d ]

Currently if a user enqueues a work item using schedule_delayed_work() the
used wq is "system_wq" (per-cpu wq) while queue_delayed_work() use
WORK_CPU_UNBOUND (used when a cpu is not specified). The same applies to
schedule_work() that is using system_wq and queue_work(), that makes use
again of WORK_CPU_UNBOUND.

This lack of consistency cannot be addressed without refactoring the API.

This patch continues the effort to refactor worqueue APIs, which has begun
with the change introducing new workqueues and a new alloc_workqueue flag:

commit 128ea9f6ccfb ("workqueue: Add system_percpu_wq and system_dfl_wq")
commit 930c2ea566af ("workqueue: Add new WQ_PERCPU flag")

This specific workload do not benefit from a per-cpu workqueue, so use
the default unbound workqueue (system_dfl_wq) instead.

Suggested-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Marco Crivellari <marco.crivellari@suse.com>
Link: https://patch.msgid.link/20251106141955.218911-4-marco.crivellari@suse.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Stable-dep-of: 870c2e7cd881 ("Input: synaptics_i2c - guard polling restart in resume")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/input/mouse/synaptics_i2c.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/input/mouse/synaptics_i2c.c b/drivers/input/mouse/synaptics_i2c.c
index a0d707e47d932..c8ddfff2605ff 100644
--- a/drivers/input/mouse/synaptics_i2c.c
+++ b/drivers/input/mouse/synaptics_i2c.c
@@ -372,7 +372,7 @@ static irqreturn_t synaptics_i2c_irq(int irq, void *dev_id)
{
struct synaptics_i2c *touch = dev_id;

- mod_delayed_work(system_wq, &touch->dwork, 0);
+ mod_delayed_work(system_dfl_wq, &touch->dwork, 0);

return IRQ_HANDLED;
}
@@ -448,7 +448,7 @@ static void synaptics_i2c_work_handler(struct work_struct *work)
* We poll the device once in THREAD_IRQ_SLEEP_SECS and
* if error is detected, we try to reset and reconfigure the touchpad.
*/
- mod_delayed_work(system_wq, &touch->dwork, delay);
+ mod_delayed_work(system_dfl_wq, &touch->dwork, delay);
}

static int synaptics_i2c_open(struct input_dev *input)
@@ -461,7 +461,7 @@ static int synaptics_i2c_open(struct input_dev *input)
return ret;

if (polling_req)
- mod_delayed_work(system_wq, &touch->dwork,
+ mod_delayed_work(system_dfl_wq, &touch->dwork,
msecs_to_jiffies(NO_DATA_SLEEP_MSECS));

return 0;
@@ -620,7 +620,7 @@ static int synaptics_i2c_resume(struct device *dev)
if (ret)
return ret;

- mod_delayed_work(system_wq, &touch->dwork,
+ mod_delayed_work(system_dfl_wq, &touch->dwork,
msecs_to_jiffies(NO_DATA_SLEEP_MSECS));

return 0;
--
2.51.0