usb: cdnsp: Fix incorrect calling of cdnsp_died function

Patch restrict calling of cdnsp_died function during removing modules
or software disconnect.
This function was called because after transition controller to HALT
state the driver starts handling the deferred interrupt.
In this case such interrupt can be simple ignored.

Fixes: 3d82904559f4 ("usb: cdnsp: cdns3 Add main part of Cadence USBSSP DRD Driver")
cc: <stable@vger.kernel.org>
Reviewed-by: Peter Chen <peter.chen@kernel.org>
Signed-off-by: Pawel Laszczak <pawell@cadence.com>
Link: https://lore.kernel.org/r/20211210112945.660-1-pawell@gli-login.cadence.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/cdns3/cdnsp-ring.c b/drivers/usb/cdns3/cdnsp-ring.c
index 1b14384..e1ac6c3 100644 (file)
--- a/drivers/usb/cdns3/cdnsp-ring.c
+++ b/drivers/usb/cdns3/cdnsp-ring.c
@@ -1523,7 +1523,14 @@ irqreturn_t cdnsp_thread_irq_handler(int irq, void *data)
        spin_lock_irqsave(&pdev->lock, flags);
 
        if (pdev->cdnsp_state & (CDNSP_STATE_HALTED | CDNSP_STATE_DYING)) {
-               cdnsp_died(pdev);
+               /*
+                * While removing or stopping driver there may still be deferred
+                * not handled interrupt which should not be treated as error.
+                * Driver should simply ignore it.
+                */
+               if (pdev->gadget_driver)
+                       cdnsp_died(pdev);
+
                spin_unlock_irqrestore(&pdev->lock, flags);
                return IRQ_HANDLED;
        }