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.
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
---
drivers/usb/dwc2/gadget.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index e8ffc080e6c7..0d34cfc71bfb 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -3653,11 +3653,13 @@ static int s3c_hsotg_suspend(struct platform_device *pdev, pm_message_t state)
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++)
@@ -3686,8 +3688,9 @@ static int s3c_hsotg_resume(struct platform_device *pdev)
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);
--
1.9.2
--
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