usb: dwc3: Remove DWC3 locking during gadget suspend/resume

Remove the need for making dwc3_gadget_suspend() and dwc3_gadget_resume()
to be called in a spinlock, as dwc3_gadget_run_stop() could potentially
take some time to complete.

Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
Link: https://lore.kernel.org/r/20220901193625.8727-3-quic_wcheng@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 8c8e326..1fe966d 100644 (file)
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1976,9 +1976,7 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg)
        case DWC3_GCTL_PRTCAP_DEVICE:
                if (pm_runtime_suspended(dwc->dev))
                        break;
-               spin_lock_irqsave(&dwc->lock, flags);
                dwc3_gadget_suspend(dwc);
-               spin_unlock_irqrestore(&dwc->lock, flags);
                synchronize_irq(dwc->irq_gadget);
                dwc3_core_exit(dwc);
                break;
@@ -2039,9 +2037,7 @@ static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg)
                        return ret;
 
                dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE);
-               spin_lock_irqsave(&dwc->lock, flags);
                dwc3_gadget_resume(dwc);
-               spin_unlock_irqrestore(&dwc->lock, flags);
                break;
        case DWC3_GCTL_PRTCAP_HOST:
                if (!PMSG_IS_AUTO(msg) && !device_may_wakeup(dwc->dev)) {

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index b918904..9077c6c 100644 (file)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -4522,12 +4522,17 @@ void dwc3_gadget_exit(struct dwc3 *dwc)
 
 int dwc3_gadget_suspend(struct dwc3 *dwc)
 {
+       unsigned long flags;
+
        if (!dwc->gadget_driver)
                return 0;
 
        dwc3_gadget_run_stop(dwc, false, false);
+
+       spin_lock_irqsave(&dwc->lock, flags);
        dwc3_disconnect_gadget(dwc);
        __dwc3_gadget_stop(dwc);
+       spin_unlock_irqrestore(&dwc->lock, flags);
 
        return 0;
 }