linux-kernel - Re: [PATCH] usb: cdnsp: Fixes incorrect value in ISOC TRB

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Date:   Sat, 6 Mar 2021 08:53:42 +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, kurahul@...ence.com,
        sparmar@...ence.com
Subject: Re: [PATCH] usb: cdnsp: Fixes incorrect value in ISOC TRB

On 21-03-05 06:10:59, Pawel Laszczak wrote:
> From: Pawel Laszczak <pawell@...ence.com>
> 
> The value "start_cycle ? 0 : 1" in assignment caused
> implicit truncation whole value to 1 byte.
> To fix the issue, an explicit casting has been added.

The root cause for this issue should be operator "|" priority higher
than "? :", I think just add () for start_cycle ? 0 : 1 could fix it.
Please double confirm it, and change the commit log if necessary

Peter
> 
> Fixes: commit 3d82904559f4 ("usb: cdnsp: cdns3 Add main part of Cadence USBSSP DRD Driver")
> Signed-off-by: Pawel Laszczak <pawell@...ence.com>
> ---
>  drivers/usb/cdns3/cdnsp-ring.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/cdns3/cdnsp-ring.c b/drivers/usb/cdns3/cdnsp-ring.c
> index f9170d177a89..d35bc4490216 100644
> --- a/drivers/usb/cdns3/cdnsp-ring.c
> +++ b/drivers/usb/cdns3/cdnsp-ring.c
> @@ -2197,7 +2197,7 @@ static int cdnsp_queue_isoc_tx(struct cdnsp_device *pdev,
>  	 * inverted in the first TDs isoc TRB.
>  	 */
>  	field = TRB_TYPE(TRB_ISOC) | TRB_TLBPC(last_burst_pkt) |
> -		start_cycle ? 0 : 1 | TRB_SIA | TRB_TBC(burst_count);
> +		(u32)(start_cycle ? 0 : 1) | TRB_SIA | TRB_TBC(burst_count);
>  
>  	/* Fill the rest of the TRB fields, and remaining normal TRBs. */
>  	for (i = 0; i < trbs_per_td; i++) {
> -- 
> 2.25.1
> 

-- 

Thanks,
Peter Chen