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Subject: Re: [PATCH 5/5] comedi: vmk80xx: fix bulk and interrupt message
 timeouts
To:     Johan Hovold <johan@kernel.org>,
        H Hartley Sweeten <hsweeten@visionengravers.com>
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
        stable@vger.kernel.org
References: <20211025114532.4599-1-johan@kernel.org>
 <20211025114532.4599-6-johan@kernel.org>
From:   Ian Abbott <abbotti@mev.co.uk>
Organization: MEV Ltd.
Message-ID: <fb1c3dcd-39cd-d4e2-e6f5-061dad6b2751@mev.co.uk>
Date:   Tue, 26 Oct 2021 15:35:44 +0100
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Precedence: bulk

On 25/10/2021 12:45, Johan Hovold wrote:
> USB bulk and interrupt message timeouts are specified in milliseconds
> and should specifically not vary with CONFIG_HZ.
> 
> Note that the bulk-out transfer timeout was set to the endpoint
> bInterval value, which should be ignored for bulk endpoints and is
> typically set to zero. This meant that a failing bulk-out transfer
> would never time out.
> 
> Assume that the 10 second timeout used for all other transfers is more
> than enough also for the bulk-out endpoint.
> 
> Fixes: 985cafccbf9b ("Staging: Comedi: vmk80xx: Add k8061 support")
> Fixes: 951348b37738 ("staging: comedi: vmk80xx: wait for URBs to complete")
> Cc: stable@vger.kernel.org      # 2.6.31
> Signed-off-by: Johan Hovold <johan@kernel.org>
> ---
>   drivers/comedi/drivers/vmk80xx.c | 12 +++++++-----
>   1 file changed, 7 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/comedi/drivers/vmk80xx.c b/drivers/comedi/drivers/vmk80xx.c
> index 9c56918e3b76..4b00a9ea611a 100644
> --- a/drivers/comedi/drivers/vmk80xx.c
> +++ b/drivers/comedi/drivers/vmk80xx.c
> @@ -91,6 +91,7 @@ enum {
>   #define IC6_VERSION		BIT(1)
>   
>   #define MIN_BUF_SIZE		64
> +#define PACKET_TIMEOUT		10000	/* ms */
>   
>   enum vmk80xx_model {
>   	VMK8055_MODEL,
> @@ -169,10 +170,11 @@ static void vmk80xx_do_bulk_msg(struct comedi_device *dev)
>   	tx_size = usb_endpoint_maxp(devpriv->ep_tx);
>   	rx_size = usb_endpoint_maxp(devpriv->ep_rx);
>   
> -	usb_bulk_msg(usb, tx_pipe, devpriv->usb_tx_buf,
> -		     tx_size, NULL, devpriv->ep_tx->bInterval);
> +	usb_bulk_msg(usb, tx_pipe, devpriv->usb_tx_buf, tx_size, NULL,
> +		     PACKET_TIMEOUT);
>   
> -	usb_bulk_msg(usb, rx_pipe, devpriv->usb_rx_buf, rx_size, NULL, HZ * 10);
> +	usb_bulk_msg(usb, rx_pipe, devpriv->usb_rx_buf, rx_size, NULL,
> +		     PACKET_TIMEOUT);
>   }
>   
>   static int vmk80xx_read_packet(struct comedi_device *dev)
> @@ -191,7 +193,7 @@ static int vmk80xx_read_packet(struct comedi_device *dev)
>   	pipe = usb_rcvintpipe(usb, ep->bEndpointAddress);
>   	return usb_interrupt_msg(usb, pipe, devpriv->usb_rx_buf,
>   				 usb_endpoint_maxp(ep), NULL,
> -				 HZ * 10);
> +				 PACKET_TIMEOUT);
>   }
>   
>   static int vmk80xx_write_packet(struct comedi_device *dev, int cmd)
> @@ -212,7 +214,7 @@ static int vmk80xx_write_packet(struct comedi_device *dev, int cmd)
>   	pipe = usb_sndintpipe(usb, ep->bEndpointAddress);
>   	return usb_interrupt_msg(usb, pipe, devpriv->usb_tx_buf,
>   				 usb_endpoint_maxp(ep), NULL,
> -				 HZ * 10);
> +				 PACKET_TIMEOUT);
>   }
>   
>   static int vmk80xx_reset_device(struct comedi_device *dev)
> 

Looks good, thanks!

Reviewed-by: Ian Abbott <abbotti@mev.co.uk>

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