[PATCH] usb: cdnsp: Fix incorrect calling of cdnsp_died function

[PATCH] usb: cdnsp: Fix incorrect calling of cdnsp_died function

[Pawel Laszczak]

From: Pawel Laszczak <pawell@cadence.com>

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>
Signed-off-by: Pawel Laszczak <pawell@cadence.com>
---
 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);
+
 		spin_unlock_irqrestore(&pdev->lock, flags);
 		return IRQ_HANDLED;
 	}
-- 
2.25.1

Re: [PATCH] usb: cdnsp: Fix incorrect calling of cdnsp_died function

[Peter Chen]

On 21-12-10 12:29:45, Pawel Laszczak wrote:
> From: Pawel Laszczak <pawell@cadence.com>
> 
> 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>
> Signed-off-by: Pawel Laszczak <pawell@cadence.com>
> ---
>  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@kernel.org>

-- 

Thanks,
Peter Chen