usb: langwell_udc: cancel pending requests when controller is suspended.

It is safer to cancel pending requests before free dTD and dQH when
controller enters suspend state.

Signed-off-by: Philippe Skowronski <philippe.skowronski@intel.com>
Signed-off-by: Hao Wu <hao.wu@intel.com>
[Switch to spin_lock_irq as suggested by Alan Stern]
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/usb/gadget/langwell_udc.c b/drivers/usb/gadget/langwell_udc.c
index 064306046702..b8ec954c0692 100644
--- a/drivers/usb/gadget/langwell_udc.c
+++ b/drivers/usb/gadget/langwell_udc.c
@@ -3391,6 +3391,11 @@ static int langwell_udc_suspend(struct pci_dev *pdev, pm_message_t state)
         /* save PCI state */
         pci_save_state(pdev);
 
+        spin_lock_irq(&dev->lock);
+        /* stop all usb activities */
+        stop_activity(dev, dev->driver);
+        spin_unlock_irq(&dev->lock);
+
         /* free dTD dma_pool and dQH */
         if (dev->dtd_pool)
                 dma_pool_destroy(dev->dtd_pool);