From c272dc2da14cde0bfd9495a5aafb8e3e94f35601 Mon Sep 17 00:00:00 2001 From: Amitoj Kaur Chawla Date: Sat, 13 Feb 2016 10:31:02 +0530 Subject: [PATCH] staging: gdm724x: gdm_mux: Remove create_workqueue() With concurrency managed workqueues, use of dedicated workqueues can be replaced by using system_wq. Drop mux_rx_wq by using system_wq. Since there is only one work item per mux_dev and different mux_devs do not need to be ordered, increase of concurrency level by switching to system_wq should not break anything. cancel_work_sync() is used to ensure that work is not pending or executing on any CPU. Lastly, since all devices are suspended, which shutdowns the work item before the driver can be unregistered, it is guaranteed that no work item is pending or executing by the time exit path runs. Signed-off-by: Amitoj Kaur Chawla Signed-off-by: Greg Kroah-Hartman --- drivers/staging/gdm724x/gdm_mux.c | 18 +++--------------- 1 file changed, 3 insertions(+), 15 deletions(-) diff --git a/drivers/staging/gdm724x/gdm_mux.c b/drivers/staging/gdm724x/gdm_mux.c index 445f83615575..937010b3a603 100644 --- a/drivers/staging/gdm724x/gdm_mux.c +++ b/drivers/staging/gdm724x/gdm_mux.c @@ -26,8 +26,6 @@ #include "gdm_mux.h" -static struct workqueue_struct *mux_rx_wq; - static u16 packet_type[TTY_MAX_COUNT] = {0xF011, 0xF010}; #define USB_DEVICE_CDC_DATA(vid, pid) \ @@ -275,7 +273,7 @@ static void gdm_mux_rcv_complete(struct urb *urb) r->len = r->urb->actual_length; spin_lock_irqsave(&rx->to_host_lock, flags); list_add_tail(&r->to_host_list, &rx->to_host_list); - queue_work(mux_rx_wq, &mux_dev->work_rx.work); + schedule_work(&mux_dev->work_rx.work); spin_unlock_irqrestore(&rx->to_host_lock, flags); } } @@ -602,6 +600,8 @@ static int gdm_mux_suspend(struct usb_interface *intf, pm_message_t pm_msg) mux_dev = tty_dev->priv_dev; rx = &mux_dev->rx; + cancel_work_sync(&mux_dev->work_rx.work); + if (mux_dev->usb_state != PM_NORMAL) { dev_err(intf->usb_dev, "usb suspend - invalid state\n"); return -1; @@ -656,13 +656,6 @@ static struct usb_driver gdm_mux_driver = { static int __init gdm_usb_mux_init(void) { - - mux_rx_wq = create_workqueue("mux_rx_wq"); - if (!mux_rx_wq) { - pr_err("work queue create fail\n"); - return -1; - } - register_lte_tty_driver(); return usb_register(&gdm_mux_driver); @@ -672,11 +665,6 @@ static void __exit gdm_usb_mux_exit(void) { unregister_lte_tty_driver(); - if (mux_rx_wq) { - flush_workqueue(mux_rx_wq); - destroy_workqueue(mux_rx_wq); - } - usb_deregister(&gdm_mux_driver); } -- 2.20.1