linux-kernel - Re: [PATCH 3/4] cp210x: Store part number

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Date:	Sun, 26 Jul 2015 15:32:54 +0200
From:	Oliver Neukum <oneukum@...e.com>
To:	Petr Tesarik <ptesarik@...e.com>
Cc:	Johan Hovold <johan@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"open list:USB SERIAL SUBSYSTEM" <linux-usb@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>,
	Petr Tesarik <ptesarik@...e.cz>
Subject: Re: [PATCH 3/4] cp210x: Store part number

On Fri, 2015-07-24 at 08:48 +0200, Petr Tesarik wrote:
> @@ -872,6 +886,12 @@ static int cp210x_startup(struct usb_serial
> *serial)
>  
>         usb_set_serial_data(serial, spriv);
>  
> +       /* Get the 1-byte part number of the cp210x device */
> +       cp210x_control_msg(serial->port[0], CP210X_VENDOR_SPECIFIC,
> +                          REQTYPE_DEVICE_TO_HOST, CP210X_GET_PARTNUM,
> +                          &partnum, 1, USB_CTRL_GET_TIMEOUT);
> +       spriv->bPartNumber = partnum & 0xFF;

DMA on the stack. That breaks the cache coherency rules.
You must kmalloc the buffer.

	Regards
		Oliver


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