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usb: cdns3: gadget: own the lock wrongly at the suspend routine 

When the system goes to suspend, if the controller is at device mode with
cable connecting to host, the call stack is: cdns3_suspend->
cdns3_gadget_suspend -> cdns3_disconnect_gadget, after cdns3_disconnect_gadget
is called, it owns lock wrongly, it causes the system being deadlock after
resume due to at cdns3_device_thread_irq_handler, it tries to get the lock,
but can't get it forever.

To fix it, we delete the unlock-lock operations at cdns3_disconnect_gadget,
and do it at the caller.

Fixes: b1234e3b3b ("usb: cdns3: add runtime PM support")
Acked-by: Pawel Laszczak <pawell@cadence.com>
Signed-off-by: Peter Chen <peter.chen@nxp.com>
zero-sugar-mainline-defconfig
Peter Chen 2020-10-29 17:55:18 +08:00
parent 52d3967704
commit e11d2bf271
No known key found for this signature in database
GPG Key ID: 4859298150D671BB
1 changed files with 7 additions and 4 deletions
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11
drivers/usb/cdns3/gadget.c
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@ -1750,11 +1750,8 @@ static int cdns3_check_ep_interrupt_proceed(struct cdns3_endpoint *priv_ep)
static void cdns3_disconnect_gadget(struct cdns3_device *priv_dev)
{
if (priv_dev->gadget_driver && priv_dev->gadget_driver->disconnect) {
spin_unlock(&priv_dev->lock);
if (priv_dev->gadget_driver && priv_dev->gadget_driver->disconnect)
priv_dev->gadget_driver->disconnect(&priv_dev->gadget);
spin_lock(&priv_dev->lock);
}
}
/**
@ -1765,6 +1762,7 @@ static void cdns3_disconnect_gadget(struct cdns3_device *priv_dev)
*/
static void cdns3_check_usb_interrupt_proceed(struct cdns3_device *priv_dev,
u32 usb_ists)
__must_hold(&priv_dev->lock)
{
int speed = 0;
@ -1789,7 +1787,9 @@ static void cdns3_check_usb_interrupt_proceed(struct cdns3_device *priv_dev,
/* Disconnection detected */
if (usb_ists & (USB_ISTS_DIS2I | USB_ISTS_DISI)) {
spin_unlock(&priv_dev->lock);
cdns3_disconnect_gadget(priv_dev);
spin_lock(&priv_dev->lock);
priv_dev->gadget.speed = USB_SPEED_UNKNOWN;
usb_gadget_set_state(&priv_dev->gadget, USB_STATE_NOTATTACHED);
cdns3_hw_reset_eps_config(priv_dev);
@ -3275,10 +3275,13 @@ err0:
}
static int cdns3_gadget_suspend(struct cdns3 *cdns, bool do_wakeup)
__must_hold(&cdns->lock)
{
struct cdns3_device *priv_dev = cdns->gadget_dev;
spin_unlock(&cdns->lock);
cdns3_disconnect_gadget(priv_dev);
spin_lock(&cdns->lock);
priv_dev->gadget.speed = USB_SPEED_UNKNOWN;
usb_gadget_set_state(&priv_dev->gadget, USB_STATE_NOTATTACHED);