[RFC PATCH v2] usb: typec: ucsi: Move long delayed work on system_dfl_long_wq

[Marco Crivellari]

Currently the code enqueue work items using {queue|mod}_delayed_work(),
using system_long_wq. This workqueue should be used when long works are
expected and it is a per-cpu workqueue.

The function(s) end up calling __queue_delayed_work(), which set a global
timer that could fire anywhere, enqueuing the work where the timer fired.

Unbound works could benefit from scheduler task placement, to optimize
performance and power consumption. Long work shouldn't stick to a single
CPU.

Recently, a new unbound workqueue specific for long running work has
been added:

    c116737e972e ("workqueue: Add system_dfl_long_wq for long unbound works")

Since the workqueue work doesn't rely on per-cpu variables, there is no
obvious reason that justify the use of a per-cpu workqueue. So change
system_long_wq with system_dfl_long_wq so that the work may benefit from
scheduler task placement.

Signed-off-by: Marco Crivellari <marco.crivellari@xxxxxxxx>
---
Changes in v2:
- Fixed a wrong change regarding system_long_wq used by queue_work() instead of queue_delayed_work()

Link to v1: https://lore.kernel.org/all/20260507142726.331206-1-marco.crivellari@xxxxxxxx/


 drivers/usb/typec/ucsi/ucsi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
index 5b7ad9e99cb9..20fb1fbc5a7a 100644
--- a/drivers/usb/typec/ucsi/ucsi.c
+++ b/drivers/usb/typec/ucsi/ucsi.c
@@ -1985,7 +1985,7 @@ static void ucsi_init_work(struct work_struct *work)
 			return;
 		}
 
-		queue_delayed_work(system_long_wq, &ucsi->work,
+		queue_delayed_work(system_dfl_long_wq, &ucsi->work,
 				   UCSI_ROLE_SWITCH_INTERVAL);
 	}
 }
@@ -2109,7 +2109,7 @@ int ucsi_register(struct ucsi *ucsi)
 		UCSI_BCD_GET_MINOR(ucsi->version),
 		UCSI_BCD_GET_SUBMINOR(ucsi->version));
 
-	queue_delayed_work(system_long_wq, &ucsi->work, 0);
+	queue_delayed_work(system_dfl_long_wq, &ucsi->work, 0);
 
 	ucsi_debugfs_register(ucsi);
 	return 0;
-- 
2.53.0