usb: dwc2: gadget: fix calls to phy control functions in suspend/resume code
This patch moves calls to phy enable/disable out of spinlock protected
blocks in device suspend/resume to fix incorrect caller context. Phy
related functions must not be called from atomic context. To protect
device internal state from a race during suspend, a call to
s3c_hsotg_core_disconnect() is added under a spinlock, what prevents any
further activity on the usb bus.
Acked-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index 5872db9..fcd2bb5 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -3642,11 +3642,13 @@
hsotg->driver->driver.name);
spin_lock_irqsave(&hsotg->lock, flags);
+ s3c_hsotg_core_disconnect(hsotg);
s3c_hsotg_disconnect(hsotg);
- s3c_hsotg_phy_disable(hsotg);
hsotg->gadget.speed = USB_SPEED_UNKNOWN;
spin_unlock_irqrestore(&hsotg->lock, flags);
+ s3c_hsotg_phy_disable(hsotg);
+
if (hsotg->driver) {
int ep;
for (ep = 0; ep < hsotg->num_of_eps; ep++)
@@ -3675,8 +3677,9 @@
hsotg->supplies);
}
- spin_lock_irqsave(&hsotg->lock, flags);
s3c_hsotg_phy_enable(hsotg);
+
+ spin_lock_irqsave(&hsotg->lock, flags);
s3c_hsotg_core_init_disconnected(hsotg);
s3c_hsotg_core_connect(hsotg);
spin_unlock_irqrestore(&hsotg->lock, flags);