On 21-12-10 12:29:45, Pawel Laszczak wrote:
> From: Pawel Laszczak <pawell@xxxxxxxxxxx>
>
> 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@xxxxxxxxxxxxxxx>
> Signed-off-by: Pawel Laszczak <pawell@xxxxxxxxxxx>
> ---
> drivers/usb/cdns3/cdnsp-ring.c | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/cdns3/cdnsp-ring.c b/drivers/usb/cdns3/cdnsp-ring.c
> index e8f5ecbb5c75..e45c3d6e1536 100644
> --- a/drivers/usb/cdns3/cdnsp-ring.c
> +++ b/drivers/usb/cdns3/cdnsp-ring.c
> @@ -1525,7 +1525,14 @@ 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);
> +
Reviewed-by: Peter Chen <peter.chen@xxxxxxxxxx>
--
Thanks,
Peter Chen
