linux-kernel - Re: [PATCH] usb: cdnsp: Fix incorrect calling of cdnsp

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Message-ID: <20211213131318.GB5346@Peter>
Date:   Mon, 13 Dec 2021 21:13:18 +0800
From:   Peter Chen <peter.chen@...nel.org>
To:     Pawel Laszczak <pawell@...ence.com>
Cc:     gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, jianhe@...arella.com,
        stable@...r.kernel.org
Subject: Re: [PATCH] usb: cdnsp: Fix incorrect calling of cdnsp_died function

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

-- 

Thanks,
Peter Chen