From: Jun Li <jun.li@nxp.com>
Date: Tue, 10 Sep 2019 14:54:57 +0800
Subject: usb: chipidea: udc: protect usb interrupt enable
Git-commit: 72dc8df7920fc24eba0f586c56e900a1643ff2b3
Patch-mainline: v5.5-rc1
References: jsc#SLE-16106
We hit the problem with below sequence:
- ci_udc_vbus_session() update vbus_active flag and ci->driver
is valid,
- before calling the ci_hdrc_gadget_connect(),
usb_gadget_udc_stop() is called by application remove gadget
driver,
- ci_udc_vbus_session() will contine do ci_hdrc_gadget_connect() as
gadget_ready is 1, so udc interrupt is enabled, but ci->driver is
NULL.
- USB connection irq generated but ci->driver is NULL.
As udc irq only should be enabled when gadget driver is binded, so
add spinlock to protect the usb irq enable for vbus session handling.
Signed-off-by: Jun Li <jun.li@nxp.com>
Signed-off-by: Peter Chen <peter.chen@nxp.com>
Acked-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
drivers/usb/chipidea/udc.c | 18 ++++++++++--------
1 file changed, 10 insertions(+), 8 deletions(-)
diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index 8c4383862373..ffaf46f5d062 100644
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -1530,13 +1530,18 @@ static const struct usb_ep_ops usb_ep_ops = {
static void ci_hdrc_gadget_connect(struct usb_gadget *_gadget, int is_active)
{
struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
+ unsigned long flags;
if (is_active) {
pm_runtime_get_sync(&_gadget->dev);
hw_device_reset(ci);
- hw_device_state(ci, ci->ep0out->qh.dma);
- usb_gadget_set_state(_gadget, USB_STATE_POWERED);
- usb_udc_vbus_handler(_gadget, true);
+ spin_lock_irqsave(&ci->lock, flags);
+ if (ci->driver) {
+ hw_device_state(ci, ci->ep0out->qh.dma);
+ usb_gadget_set_state(_gadget, USB_STATE_POWERED);
+ usb_udc_vbus_handler(_gadget, true);
+ }
+ spin_unlock_irqrestore(&ci->lock, flags);
} else {
usb_udc_vbus_handler(_gadget, false);
if (ci->driver)
@@ -1555,19 +1560,16 @@ static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
{
struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
unsigned long flags;
- int gadget_ready = 0;
spin_lock_irqsave(&ci->lock, flags);
ci->vbus_active = is_active;
- if (ci->driver)
- gadget_ready = 1;
spin_unlock_irqrestore(&ci->lock, flags);
if (ci->usb_phy)
usb_phy_set_charger_state(ci->usb_phy, is_active ?
USB_CHARGER_PRESENT : USB_CHARGER_ABSENT);
- if (gadget_ready)
+ if (ci->driver)
ci_hdrc_gadget_connect(_gadget, is_active);
return 0;
@@ -1827,6 +1829,7 @@ static int ci_udc_stop(struct usb_gadget *gadget)
unsigned long flags;
spin_lock_irqsave(&ci->lock, flags);
+ ci->driver = NULL;
if (ci->vbus_active) {
hw_device_state(ci, 0);
@@ -1839,7 +1842,6 @@ static int ci_udc_stop(struct usb_gadget *gadget)
pm_runtime_put(&ci->gadget.dev);
}
- ci->driver = NULL;
spin_unlock_irqrestore(&ci->lock, flags);
ci_udc_stop_for_otg_fsm(ci);